CN101296186B - Routing switching device, method and switching cable fastener plate - Google Patents

Abstract

The invention discloses route switching equipment, a switching line card and a route switching method, wherein, the route switching equipment comprises an Ethernet switching unit, a route line card and the switching line card comprising a Layer 2 switching chip/a Layer 3 switching chip, wherein, message transmission between the switching line cards, and between the switching line card and the route line card is carried out by the Ethernet switching unit. The technical proposal disclosed by the invention can lower the complexity of management.

Description

A routing switching device, method and switching line card board

technical field

The invention relates to the technical field of communication, in particular to a routing switching device, a method and a switching line card board.

Background technique

A router is the third layer (L3) of the OSI (Open System Interconnection) protocol model, that is, a packet switching device (or network layer relay device) in the network layer. Routing technology consists of two most basic activities, namely, determining the most The optimal path and transmission data packets, that is, IP packets. After the router receives the packet, it first removes (unpacks) the packet header of the link layer, reads the destination address, and then searches the routing table. If it can determine where to send it next, it adds the packet header of the link layer ( package), and forward the message to the next router that can reach the destination. When the next router receives the message, it will also check its destination address and use an appropriate path to continue sending it to the following routers. And so on, until the packet reaches the final destination. If the router cannot determine the address of the next step, it returns a message to the source address and discards the message. Among them, routers have many types of ports, support many layer-3 protocols, and have strong routing capabilities, so they are suitable for the interconnection between large networks.

FIG. 1 shows a schematic structural diagram of a router in the prior art, including: a main control board and routing line card boards (interface boards, service boards, etc.). Wherein, the main control board includes a main control engine and an Ethernet switching unit. Wherein, the Ethernet switching unit can also be located outside the main control board, for example, the Ethernet switching unit can be placed on the backboard, or the Ethernet switching unit can also be an independent switching board. The Ethernet switching unit is connected to each routing line card board, and includes two functions of a control plane and a data plane. Among them, the control plane of the Ethernet switching unit is used to complete the configuration of the line card board, routing information delivery, program upgrade, control message and protocol message reporting and other services; the data plane of the Ethernet switching unit is used to complete the line card board In addition, some specific control messages can also be reported to the main control board through the data plane. The main control engine is connected with the Ethernet switching unit, and is used to complete routing control, message processing, etc. It can be seen that usually only the data plane of the Ethernet switching unit is involved when the packet is forwarded.

Wherein, the routing line card board shown in Figure 1 can be a distributed routing line card board, which is used to complete distributed forwarding, that is, each routing line card board has a forwarding engine for controlling message forwarding, and the routing line card board completes the forwarding engine. After configuration, the ingress port receives packets from the outside, and the forwarding engine of the routing line card checks the routing and forwarding table according to the information in the packets, updates the header information of the packets, and forwards the packets to the corresponding The routing line card board sends the message through the egress port by the corresponding routing line card board.

However, routers are generally based on the CPU (Central Processor Unit, central processing unit) to process and forward messages in the way of "single-hop clock, instruction calculation, that is, the control center of the routing line board is usually the CPU, this way The efficiency of forwarding messages is relatively low. With the rapid rise and wide application of Ethernet and TCP/IP (Transmission Control Protocol/Internet Protocol), the internal network of enterprises is becoming larger and larger, and the efficiency of router forwarding messages can no longer meet Application requirements, and Ethernet has become the largest wide area network, these changes have directly led to the emergence of switches.

Switches include Layer 2 (L2) switches and Layer 3 (L3) switches. A Layer 2 switch is a device at the data link layer of the OSI protocol model, which can read the MAC (Media Access Control) address information in the message and perform switching based on the MAC address. Because the two-layer switch generally has a very wide switching bus bandwidth, it can perform data exchange for many ports at the same time, and because the two-layer switch generally contains an ASIC (Application specific Integrated Circuit) chip specially used to process message forwarding , so the forwarding speed can be very fast. There is a layer-2 forwarding table inside the layer-2 switch, and this forwarding table indicates the correspondence between MAC addresses and switch ports. When the switch receives a message from a certain port, it first reads the source MAC address in the packet header, so that it knows which port the machine with the source MAC address is connected to, and then reads the destination MAC address in the packet header address, and look up the corresponding port in the forwarding table, if there is a port corresponding to the destination MAC address in the table, then copy the message directly to this port, if the corresponding port cannot be found in the table, then copy the message Broadcast to all ports, when the destination machine responds to the source machine, the switch can learn which port the destination MAC address corresponds to, and it is no longer necessary to broadcast to all ports when sending a message next time.

However, Layer 2 switches are mainly suitable for small LANs, where the number of machines is less than 20 or 30. In such a network environment, broadcast messages have little effect on network congestion. For large-scale LANs, in order to reduce the harm of broadcast storms, it is necessary to divide the large-scale LANs into small LANs one by one according to factors such as functions or regions, that is, small virtual local area network (VLAN) segments one by one, which will inevitably lead to existence of different VLANs. For a large number of mutual visits, it is impossible to realize the mutual visits between the networks simply by using a layer 2 switch; and by using only a router, due to the limited number of ports and the slow routing speed, which limits the scale of the network and the access speed, so in this environment , Usually the exchange in the VLAN network is done by a layer 2 switch, and the router is responsible for the routing work between the networks. Alternatively, a large LAN can also be forwarded by a Layer 3 switch.

A layer-3 switch is a layer-2 switch with a layer-3 routing function, which is suitable for the network layer of the OSI protocol model. Its interface type is simple and has a strong layer-2 packet processing capability, so it is suitable for large-scale LANs. There is a three-layer forwarding table inside the three-layer switch, and this forwarding table indicates the corresponding relationship between the network segment address prefix (Prefix), the next-hop host address (NextHop), and the Address Resolution Protocol (ARP) information corresponding to the destination IP address. When a Layer 3 switch receives an Ethernet message, it first finds the network segment address prefix that best matches the destination IP address of the message, and then finds the next-hop host address through the network segment address prefix, and then uses the The next-hop host address finds the corresponding ARP information, and then replaces the destination MAC address of the message with the MAC address in the ARP information, and replaces the source MAC address of the message with the outgoing port MAC address of the Layer 3 switch, that is, updates according to the ARP information. message header, and then send the message through the port and VLAN corresponding to the destination MAC address of the message. However, the most important purpose of a Layer 3 switch is to speed up data exchange within a large LAN, and the routing function incorporated also serves this purpose, so its routing function is not as strong as that of a professional router of the same level. In the case of heavy network traffic, if a Layer 3 switch performs both intra-network switching and inter-network routing, its burden will be greatly increased and the response speed will be affected. Therefore, when the network traffic is very large, but the response speed is required to be high, the three-layer switch is usually used for the switching in the network, and the router is responsible for the routing work between the networks.

In addition, in some networking systems, both Layer 2 switches and Layer 3 switches are used for intra-network switching. In actual implementation, the Layer 2 switch will receive the message first, and search the Layer 2 forwarding table according to the information in the message. If the port corresponding to the destination MAC address in the message is found, the data packet will be directly copied to this port. . If it cannot be found, the layer-3 switch will search the layer-3 forwarding table, update the packet header according to the search result, and send the packet through the corresponding port.

It can be seen that in the current networking system, the router and the switch are two independent devices. In the networking, the second-layer and/or third-layer (L2/L3) switches are usually used for the switching in the network, and the router is responsible for the inter-network switching. routing works. In this way, on the one hand, there are many devices that need to be maintained, and the management is complicated; on the other hand, different devices need to be purchased separately, and the cost is high.

Contents of the invention

In view of this, the present invention provides a routing switching device and a switching line card board on the one hand, and provides a routing switching method on the other hand, so as to reduce management complexity.

The routing switching equipment provided by the present invention includes: an Ethernet switching unit, a routing line card board, and a switching line card board including a Layer 2 L2/Layer 3 L3 switching chip and an interface conversion unit supporting the HiGig protocol, wherein,

Messages are forwarded between switch line card boards, and between switch line card boards and routing line card boards through the Ethernet switching unit, and the switch line card boards send and receive messages through the interface conversion unit and the Ethernet switching unit.

Preferably, the L2/L3 switching chip is used to receive Ethernet messages from the outside, check the L2/L3 forwarding table according to the destination address of the message, if the destination chip number MOD ID that needs to be forwarded across boards is found And purpose port number, then described purpose MOD ID and purpose port number are encapsulated in the HiGig head that is positioned at Ethernet message front, constitute HiGig message, described HiGig message is delivered to interface conversion unit; Receive from interface conversion The HiGig message of the unit, stripping the HiGig header in the message, and sending the message from the corresponding port according to the destination port number in the HiGig header;

The interface conversion unit is used to receive the HiGig message from the L2/L3 switching chip, and search for the correspondence between the MOD ID stored in itself and the board media access control MAC address according to the purpose MOD ID in the HiGig header of the message relational table, obtain the destination board MAC address, encapsulate the destination board MAC address in the MAC header positioned at the front of the HiGig header, form an Ethernet message, and send the Ethernet message to the Ethernet switching unit; receive From the Ethernet message of the Ethernet switching unit, strip the MAC header of the message, restore the message to a HiGig message, and pass the HiGig message to the L2/L3 switch chip;

The routing line card board is used to receive messages from the outside, according to the destination address of the message, check the routing forwarding table stored in itself including the purpose MOD ID, if the purpose MOD that needs to be forwarded to the switching line card board is found ID and purpose port number, then encapsulate the purpose MOD ID and purpose port number in the HiGig header located in front of the Ethernet message, and search for the corresponding relationship between the MOD ID stored in itself and the board MAC address according to the purpose MOD ID table, obtain the destination board MAC address, encapsulate the destination board MAC address in the MAC header positioned at the front of the HiGig head, form an Ethernet message, and send the Ethernet message to the Ethernet switching unit; receive the Ethernet The network switching unit forwards the Ethernet message from the switch line card board, strips the MAC header and the HiGig header of the message, and sends the message from the corresponding port according to the destination port number in the HiGig header;

The Ethernet switching unit is used to receive the Ethernet message from the switching line card board and the routing line card board, and forward the message to the corresponding line card board according to the MAC address of the destination board in the message.

Preferably, when the L2/L3 switching chip checks the L2/L3 forwarding table according to the destination address of the message, if the corresponding destination MOD ID and destination port number cannot be found, then the preset specific destination MOD ID and The destination port number is encapsulated in the HiGig header located in front of the Ethernet message to form a HiGig message, and the HiGig message is passed to the interface conversion unit;

After the interface conversion unit receives the HiGig message, if the purpose MOD ID in the message is the specific MOD ID, then according to the MOD ID, find the default routing line card board corresponding to the MOD ID setting MAC address of the board, the MAC address of the destination board and the corresponding default identification are encapsulated in the MAC header located in front of the HiGig header, and the formed Ethernet message is sent to the Ethernet switching unit;

After the default routing line card board receives the Ethernet message forwarded by the Ethernet switching unit, according to the default identification bit in the MAC header, after stripping the MAC header and the HiGig header of the message, the The above-mentioned message is processed as a message from the outside.

The switching line card board provided by the present invention includes: a layer-2 L2/layer-3 L3 switching chip and an interface conversion unit supporting the HiGig protocol;

The L2/L3 switching chip is used to receive the Ethernet message from the outside, and check the L2/L3 forwarding table according to the destination address of the message, if the destination board number MOD ID and the destination port number that need to be forwarded across boards are found , the MOD ID and the destination port number are encapsulated in the HiGig header positioned in front of the Ethernet message to form a HiGig message, and the HiGig message is passed to the interface conversion unit; the HiGig message from the interface conversion unit is received , stripping the HiGig header in the message, and sending the message out from the corresponding port according to the destination port number in the HiGig header;

The interface conversion unit is used to receive the HiGig message from the L2/L3 switching chip, and search for the correspondence between the MOD ID stored in itself and the board media access control MAC address according to the purpose MOD ID in the HiGig header of the message relational table, obtain the destination board MAC address, encapsulate the destination board MAC address in the MAC header positioned at the front of the HiGig header, form an Ethernet message, and send the Ethernet message to the Ethernet switching unit; receive For the Ethernet message from the Ethernet switching unit, strip the MAC header of the message, restore the message to a HiGig message, and pass the HiGig message to the L2/L3 switch chip.

When the L2/L3 switching chip checks the L2/L3 forwarding table according to the destination address of the message, if the corresponding destination MOD ID and destination port number cannot be found, then the preset specific destination MOD ID and destination port number are encapsulated In the HiGig header located in front of the Ethernet message, a HiGig message is formed, and the HiGig message is passed to the interface conversion unit;

After the interface conversion unit receives the HiGig message, if the purpose MOD ID in the message is the specific MOD ID, then according to the MOD ID, find the default routing line card board corresponding to the MOD ID setting MAC address of the board, encapsulate the MAC address of the destination board and the corresponding default identifier in the MAC header located in front of the HiGig header, and send the formed Ethernet message to the Ethernet switching unit.

Preferably, the interface conversion unit includes: a cache channel consistent with the total number of routing line card boards and switching line card boards, a first receiving and sending module, a second receiving and sending module, a flow management control module, and a first message modification module and a second change module, where,

Each buffer channel corresponds to a line card board, and includes a forward channel and a reverse channel, which are used to store messages in the two directions of the corresponding line card board;

The first receiving and sending module is used to receive the HiGig message from the L2/L3 switching chip, and send the message to the forward channel of the corresponding buffer channel according to the purpose MOD ID in the message; and receive Send the message from the second message modification module to the L2/L3 switching chip;

The second receiving and sending module is used to receive the Ethernet message from the Ethernet switching unit, and send the message to the reverse channel of the corresponding buffer channel according to the source board MAC address field in the message ; And receive the message from the first message modification module, and send the message to the Ethernet switching unit;

The flow management control module is used to dispatch messages from the forward channel or reverse channel of the corresponding buffer channel in round robin or based on priority, and provide the messages scheduled from the forward channel to the first message modification module , providing the message called from the reverse channel to the second message modification module;

The first message modification module is used to receive the message provided by the flow management control module, and search the corresponding relationship table between the MOD ID and the board MAC address stored in itself according to the purpose MOD ID in the HiGig header of the message, Obtain the MAC address of the destination board, encapsulate the MAC address of the destination board in the MAC header located in front of the HiGig head, form an Ethernet message, and send the Ethernet message to the second receiving and sending module;

The second message modification module is used to receive the message provided by the flow management control module, strip the MAC header in the message, restore the HiGig message, and send the HiGig message to the first receiving and sending module.

Or, each buffer channel corresponds to a line card board, and includes a forward channel and a reverse channel, which are respectively used to store messages in two directions corresponding to the line card board;

The flow management control module is used to schedule messages from the forward channel or reverse channel of the corresponding buffer channel in round robin or based on priority, and provide the messages scheduled from the forward channel to the second receiving and sending module, Provide the message called from the reverse channel to the first receiving and sending module;

The first receiving and sending module is used to receive the HiGig message from the L2/L3 switching chip, and send the message to the first message modification module; receive the message dispatched by the traffic management control module, and send the message to the first message modification module; Send to L2/L3 switch chip;

The first message modification module is used to receive the HiGig message from the first receiving and sending module, and searches for the correspondence table of the MOD ID stored in itself and the board MAC address according to the purpose MOD ID in the HiGig header of the message, Obtain the MAC address of the destination board, encapsulate the MAC address of the destination board in the MAC header positioned at the front of the HiGig header to form an Ethernet message, and send the Ethernet message to the In the forward channel of the corresponding cache channel;

The second receiving and sending module is used to receive the Ethernet message from the Ethernet switching unit, and send the message to the second message modification module; receive the message scheduled by the flow management control module, and send the message to the Send to the Ethernet switching unit;

The second message modification module is used to receive the Ethernet message from the second receiving and sending module, strip the MAC header in the message, restore the HiGig message, and according to the source MOD ID in the message, Send the HiGig message to the reverse channel of the corresponding buffer channel.

Preferably, after the first message modification module receives the HiGig message from the L2/L3 switch chip, before encapsulating the target board MAC address in the MAC header located in front of the HiGig header, further Strip the HiGig header in the message, and add the simplified HiGig header;

After stripping the MAC header of the packet, the second packet modification module further strips the simplified HiGig header and adds a standard HiGig header before restoring the packet to a HiGig packet.

The routing switching method provided by the present invention is applied to routing switching equipment including routing line card boards and switching line card boards, the routing switching equipment includes Ethernet switching units, and the switching line card boards include HiGig protocols L2/L3 switch chip and interface conversion unit, the method includes:

The switching line card board forwards messages to other switching line card boards or routing line card boards through the interface conversion unit and the Ethernet switching unit, and receives messages from other switching line card boards or routing line card boards through the Ethernet switching unit and the interface conversion unit message;

The routing line card board forwards messages to other routing line card boards or switching line card boards through the Ethernet switching unit, and receives messages from other routing line card boards or switching line card boards through the Ethernet switching unit.

Preferably, the switching line card board forwarding messages to other switching line card boards or routing line card boards through the interface conversion unit and the Ethernet switching unit includes: the L2/L3 switching chip in the switching line card board receives external message, check the L2/L3 forwarding table according to the destination address in the message, if the destination MOD ID and destination port number that need to be forwarded across boards are found, then the destination MOD ID and destination port number are encapsulated in the Ethernet In the HiGig header in front of the message, a HiGig message is formed, and the HiGig message is passed to the interface conversion unit; the interface conversion unit searches for the MOD ID and board MAC stored in itself according to the purpose MOD ID in the HiGig header of the message The correspondence table of the address, obtains the target board MAC address, encapsulates the target board MAC address in the MAC header positioned at the front of the HiGig header to form an Ethernet message, and sends the Ethernet message to the Ethernet switch unit; the Ethernet switching unit sends the message to the corresponding switching line card board or routing line card board according to the destination board MAC address in the MAC header of the message;

The switching line card board receiving messages from other switching line card boards or routing line card boards through the Ethernet switching unit and the interface conversion unit includes: the interface conversion unit of the switching line card board receives messages from other switching lines forwarded by the Ethernet switching unit. For the message of the line card board or the routing line card board, strip the MAC header of the message, restore the message to a HiGig message, and pass the restored HiGig message to the L2/L3 switch chip; L2/L3 After the switch chip receives the HiGig message from the interface conversion unit, it strips off the HiGig header in the message, and sends the message from the corresponding port according to the destination port number in the HiGig header;

The forwarding of the message by the routing line card board to other routing line card boards or switching line card boards through the Ethernet switching unit includes: the routing line card board receives the Ethernet message from the outside, and checks the route according to the destination address of the message Forwarding table; according to the purpose MOD ID obtained by looking up the table, look up the corresponding relationship table between MOD ID and board MAC address, and the corresponding relationship table between board MAC address or MOD ID and the line card board type, and obtain the board MAC address and line card board type , when the line card type shows that the destination line card is a switching line card, the information such as the destination MOD ID and the destination port number are encapsulated in the HiGig header in front of the Ethernet message, and the MAC address of the destination board is encapsulated in the In the MAC header in front of the HiGig header, an Ethernet message is formed, and the Ethernet message is sent to the Ethernet switching unit; the Ethernet switching unit sends the MAC address of the destination board according to the MAC header of the message to The message is sent to the corresponding switching line card board or routing line card board;

The routing line card board receiving messages from other routing line card boards or switching line card boards through the Ethernet switching unit includes: the routing line card board receives the Ethernet message from the Ethernet switching unit, and according to the source in the message Check the table in the MAC address field of the board to obtain the type of the source line card board. When the online card board type shows that the message comes from the switching line card board, strip the MAC header and HiGig header of the message, and according to the purpose in the HiGig header The port number sends the message from the corresponding port.

It can be seen from the above scheme that in the present invention, a switching line card board including an L2/L3 switching chip is set in the routing device, and the intercommunication between the switching line card board and the routing line card board is realized, so that the routing device has both routing functions It also has a switching function. When networking, it is only necessary to manage and maintain one routing and switching device, which reduces the complexity of management.

In addition, in order to realize that the MAC address learning between the line card boards does not affect the Ethernet switching unit of the switching network, the principle of the HiGig protocol is used in the present invention, and the L2/L3 switching chip supporting the HiGig protocol is used to realize the switching line card in the present invention board, and by adding an interface conversion unit to realize the adaptation of the HiGig interface and the Ethernet interface, so that the message forwarding efficiency of the system can be improved on the basis of completing the message forwarding between the line card boards.

Further, in order to effectively utilize the bandwidth, the HiGig header involved in the present invention may use a simplified HiGig header.

Finally, in order to avoid the inability to find a certain destination address due to the lack of content in the forwarding table in the L2/L3 switch chip, a default line card board can be set in this case, and the L2/L3 switch chip will forward the message to For the default line card board, the default line card board regards the message as a new message and searches for a corresponding destination address before forwarding it.

Description of drawings

Fig. 1 is a schematic structural diagram of a router in the prior art;

FIG. 2 is an exemplary structural diagram of a routing and switching device in an embodiment of the present invention;

Fig. 3 is a schematic diagram of switching network networking based on the HiGig protocol;

Fig. 4 is a schematic diagram of the internal structure and connection relationship of the switching line card board in the embodiment of the present invention;

FIG. 5 is a schematic diagram of a format of an Ethernet message in the prior art;

FIG. 6 is a schematic diagram of a format of a HiGig message in the prior art;

7 is a schematic diagram of the format of the Ethernet message sent by the line card board to the Ethernet switching unit and its relationship with the HiGig message in the embodiment of the present invention;

FIG. 8 is a schematic diagram of an internal structure of an interface conversion unit in a switching line card board in an embodiment of the present invention;

FIG. 9 is another schematic diagram of the internal structure of the interface conversion unit in the switching line card board in the embodiment of the present invention;

Fig. 10 is a schematic diagram of the internal structure of the first receiving and sending module of the interface conversion unit shown in Fig. 8 or Fig. 9;

FIG. 11 is a schematic diagram of the internal structure of the second receiving and sending module of the interface conversion unit shown in FIG. 8 or FIG. 9;

Fig. 12 is a flow chart of receiving an external message by a switching line card board in an embodiment of the present invention and forwarding it to other line card boards through an Ethernet switching unit;

FIG. 13 is a flow chart of the switch line card board receiving messages from other line card boards through the Ethernet switching unit in the embodiment of the present invention;

FIG. 14 is a flow chart of the routing line card board receiving external messages and forwarding them to other line card boards through the Ethernet switching unit in the embodiment of the present invention;

FIG. 15 is a flow chart of a routing line card board receiving messages from other line card boards through an Ethernet switching unit in an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, in order to reduce the complexity of management, the function of the switch can be integrated in the router, so that the router and the switch can be changed from two independent devices into one routing and switching device. That is, one or more switching line card boards including L2/L3 switching chips can be set, so that these switching line card boards have the functions of L2/L3 switches, and the switching line card boards can be used as part of the line card boards of the router It is connected to the main control board of the router, and the Ethernet switching unit of the main control board performs message forwarding between each switching line card board, and between the switching line card board and the routing line card board.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

FIG. 2 is an exemplary structural diagram of a routing and switching device in an embodiment of the present invention. As shown in Figure 2, the device includes: a main control board, a routing line card board and a switching line card board.

Wherein, the main control board includes a main control engine and an Ethernet switching unit, the main control engine is connected to the Ethernet switching unit, and the Ethernet switching unit is respectively connected to each routing line card board and switching line card board. The switch line card includes an L2/L3 switch chip. Among them, in addition to the packet forwarding between the routing line card boards through the Ethernet switching unit, the packet forwarding is performed between the switching line card boards, between the switching line card board and the routing line card board through the Ethernet switching unit .

During specific implementation, the L2/L3 switching chip in the switching line card board can be directly connected to the Ethernet switching unit through the Ethernet, and at this time, the switching line card boards, the switching line card board and the routing line card board can be Based on the existing Ethernet protocol, the packet is forwarded through the Ethernet switching unit. But there will be some disadvantages in this way, that is: since the Ethernet switching unit itself is also equivalent to a three-layer switching chip at this time, if data forwarding needs to be performed across the switching line card board, the message will pass through the switching line card board-Ethernet Switching unit-Switching the line card board is equivalent to passing through three switching chips. In this way, the Ethernet switching unit needs to maintain the L2/L3 forwarding table and synchronize the aging update, but in this case, the CPU of the main control board will be burdened. , and when the message is forwarded by L2/L3, all three switching chips will search the forwarding table, which will inevitably cause a waste of resources; in addition, each time a switching chip is searched, the timeout timer will be reduced once. Three switching chips will be subtracted three times, which will easily cause timeout and cause the message to be discarded.

For this reason, in the embodiment of the present invention, it is considered to use the HiGig protocol defined by Broadcom to connect the L2/L3 switching chips. The physical interface of the HiGig protocol is the IEEE 802.3ae standard XAUI interface (10 Gigabit Ethernet connection unit interface), in which, each channel has a rate of 3.125Gbps, 8B/10B encoding, and the interface rate is 10Gbps; the interface can also support 12Gbps. 3.75Gbps rate per channel. The HiGig protocol includes HiGig and HiGig+, among which, HiGig works in 10Gbps mode, and HiGig+ works in 12Gbps mode. For the sake of description, HiGig is taken as an example for description below.

The most basic transmission mode of the HiGig protocol is to add a HiGig header in front of the standard Ethernet frame header. The HiGig header includes the source MOD ID (MOD address, also called the source chip number), the destination MOD ID (also called the destination chip number), packet type, source port number, destination port number and other information. A switching network implemented based on the HiGig protocol is shown in FIG. 3 , and FIG. 3 is a schematic diagram of a switching network based on the HiGig protocol in the prior art. Among them, the switching unit in the main control board is a switching unit that supports the HiGig protocol, and the line card board is a L2/L3 switching chip that supports the HiGig protocol, that is, the switching network uses the HiGig mode as a bridge for the switching chip to connect multiple switching chips. .

Each L2/L3 switch chip stores a layer-2/layer-3 forwarding table. The entries in the layer-2 forwarding table and some entries in the layer-3 forwarding table can be shown in Table 1. When searching in the layer-2 forwarding table, The keyword of search comprises the purpose MAC address in the Ethernet message, and the result of search comprises purpose MOD ID (as DST_MODID in table 1) and purpose port (as DEST_PORT in table 1); Search in the three-layer forwarding table When, the keyword of search comprises the purpose IP address etc. in the Ethernet message, the result of search comprises purpose MOD ID (as DST_MODID in table 1) and purpose port number (as DEST_PORT in table 1).

Table 1

In Figure 3, each switching chip is logically a whole, and the switching unit only completes the cross-chip transmission of messages according to the destination MOD ID and message type in the HiGig header. Taking Layer 2 forwarding as an example, assume that a switch chip A learns a MAC address as MAC A, which corresponds to the third port of switch chip A. At this time, the forwarding table of the switching unit does not need to be modified. It is only necessary to add an entry to the Layer 2 forwarding table of the switching chip B. The content is: the MOD ID corresponding to the destination MAC address MAC_A is MOD_A, and the port is 3. When a port of switch chip B receives a message whose destination address is MAC_A, it looks up the Layer 2 forwarding table and obtains MOD_A and port number 3. These information are added to the HiGig header, and the message is sent to the switching unit, and the switching unit The message is sent to switch chip A according to MOD_A, the message reaches switch chip A, and is sent out through port 3. In the HiGig mode, the learning of the destination MAC address does not affect the switching unit. Also for the three-layer forwarding, the packet is processed by the switch chip of the incoming interface for three-layer table lookup, and the switching unit determines the forwarding of the packet according to the destination MOD ID and the packet type in the HiGig header.

It can be seen that for a switching network including L2/L3 switching chips supporting the HiGig protocol, different switching chips in the switching network are identified by MOD IDs instead of the MAC addresses in their respective forwarding tables. For the switching unit in the network, the learning of the switching chip to the destination MAC address is transparent, and the switching unit does not need to care about it, that is, the switching unit only needs to know the MOD ID of different switching chips. In the embodiment of the present invention, although the switching unit does not use the HiGig mode as a bridge for the switching chip, the present invention can still implement the switching line card board in the present invention by using the L2/L3 switching chip supporting the HiGig protocol based on the HiGig principle. And because the Ethernet mode is adopted as the bridge of the switching chip in the embodiment of the present invention, so in order to enable the Ethernet switching unit to recognize the message from the switching line card board, an interface conversion unit can be set in each switching line card board, It is used to complete the mutual conversion between the HiGig interface of the L2/L3 switching chip and the Ethernet interface of the Ethernet switching unit, and the Ethernet switching unit completes the report according to the MAC address of the board corresponding to the MODID in the message sent by the interface conversion unit. Cross-chip transmission of text.

As shown in FIG. 4, FIG. 4 shows a schematic diagram of the internal structure of the switch line card board and its connection relationship in the embodiment of the present invention. The switching line card board includes: an L2/L3 switching chip supporting the HiGig protocol and an interface conversion unit. Wherein, the L2/L3 switch chip is connected with the Ethernet switch unit through the interface conversion unit.

During specific implementation, in order to enable message forwarding between line card boards, in the embodiment of the present invention, a board corresponding to the slot number is provided for each line card board (including the switching line card board and the routing line card board). MAC address and MOD ID, and set the corresponding relationship between the board MAC address and MOD ID of each line card board in the interface conversion unit of the exchange line card board and the routing line card board. As in the interface conversion unit of the switching line card board and the routing line card board, the destination board MAC address lookup table as shown in Table 2 is set, when searching in the lookup table, the keywords of the search include the purpose MOD ID (as shown in the table DST_MODID in 2), the query result includes the MAC address of the destination board. Further, the query result may also include the type of the line card, for example, 1 indicates the switching line card, and 0 indicates the routing line card; or vice versa; or the line card type expressed in other forms. Alternatively, a line card type lookup table can also be set in the interface conversion unit of the switching line card board and the routing line card board, as shown in Table 3, when searching in the line card board type lookup table, the keyword to be searched Including the target MOD ID or the MAC address of the target board or the slot number or board number corresponding to the MAC address of the target board. Switching line card board, use 0 to represent the routing line card board; or vice versa; or use other forms to represent the line card board type.

Table 2

table 3

Among them, the board MAC address in Table 2 and Table 3 is not the same as the MAC address in the external Ethernet message received by the line card board. The board MAC address here is only used to indicate which line card board it is, that is, the Ethernet The switching unit uses the board MAC address corresponding to the MOD ID to identify each line card board.

When cross-board forwarding is required between switching line cards or between switching line cards and routing line cards, the line card will search for the destination MOD ID and destination port and other information, and encapsulate this information in the HiGig header added before the message, and then find the corresponding destination board MAC address and other information according to the destination MOD ID, and encapsulate this information in the MAC header added before the HiGig header , and then send the message to the Ethernet switching unit; the Ethernet switching unit sends the message to the corresponding destination line card according to the MAC address of the destination board in the message. After the destination line board strips the MAC header and HiGig header in the message, it sends out the message according to the destination port number of the message.

The switching line card board in the embodiment of the present invention is firstly described in detail below:

(1) The switch line card board receives Ethernet packets from the outside through the L2/L3 switch chip.

The L2/L3 switching chip in the switch line card board receives an external Ethernet message, and the format of the Ethernet message can be as shown in Figure 5, and Figure 5 shows a format of the Ethernet message in the prior art schematic diagram. The corresponding meanings of each field in the message are shown in Table 4:

field length meaning IPG 12B (byte) Ethernet frame gap, 12 bytes Preamble 8B Ethernet frame preamble MAC_DA 6B Destination MAC address MAC_SA 6B source MAC address TPID 2B VLAN protocol type, 0x8100, the first two bytes of the VLAN Header COS 4b Packet priority, the first 4 bits of the last two bytes of the VLAN Header VID 12b Packet VLAN ID, the last 12 bits of the last two bytes of the VLAN Header Packet_Data indeterminate message payload FCS 4B CRC checksum of Ethernet frame

Table 4

The L2/L3 switching chip searches the Layer 2/Layer 3 forwarding table according to the message information, such as the destination MAC address. When finding the corresponding destination outbound port information, if the outbound port is its own port, the L2/L3 switching chip Directly copy the message to the corresponding port for sending. If the outgoing port is the port of another line card board, it needs to be forwarded across boards. The L2/L3 switching chip will send the destination outgoing port information, such as DST_MODID and DEST_PORT, etc. , encapsulated in the HiGig header to form a HiGig message (if three-layer forwarding is performed, the MAC header of the original Ethernet message will also be updated). In some cases, the forwarding table of the L2/L3 switching chip may be relatively small, and the corresponding destination output port information may not be found during the above table lookup. In this case, the message can be discarded, or the The message is sent to a default line card board. Usually, since the routing and forwarding table of the routing line card has more information, the default line card may be a routing line card. During specific implementation, a specific DST_MODID and DEST_PORT can be set in advance, and the table entry corresponding to the specific DST_MODID and the board MAC address of the default line card board is set in the board MAC address lookup table of the interface conversion unit, then the L2/L3 exchange When the chip does not find the corresponding destination port information, it encapsulates the specific DST_MODID, DEST_PORT and other HiGig header related information in the HiGig header to form a HiGig message.

As shown in FIG. 6 , FIG. 6 shows a schematic diagram of a format of a HiGig message in the prior art. It can be seen that the HiGig message has partially changed the format of the Ethernet message shown in Figure 5, removed the 8-byte preamble and the 4-byte frame gap of the Ethernet message shown in Figure 5, and added 12-byte HiGig header. In addition, the FCS of the message is also recalculated to include the checksum of the HiGig header.

Wherein, for the L2/L3 switching chip, no matter the type of the line card is a routing line card or a switching line card, the processing process may be the same.

The L2/L3 switching chip passes the formed HiGig message to the interface conversion unit. After the interface conversion unit receives the HiGig message from the L2/L3 switching chip, it searches for the correspondence between the MAC address of the board and the MOD ID according to the purpose MOD ID in the HiGig header. The relationship table, such as the target board MAC address lookup table shown in Table 2, after finding the target board MAC address, add the MAC header information that can be recognized by the Ethernet switching unit including the target board MAC address before the HiGig message, so that the HiGig The message is converted into an Ethernet message, and then the interface conversion unit sends the converted Ethernet message to the Ethernet switching unit. Wherein, if the purpose MOD ID in the HiGig header is a preset specific DST_MODID, then the interface conversion unit can add an identification bit in the MAC header when adding the MAC header information to indicate that the destination line card board of the current message is The default line card board after the table lookup fails.

The format of the Ethernet message converted by the interface conversion unit is shown in Figure 7, and Figure 7 shows the format of the Ethernet message sent by the line card board to the Ethernet switching unit in the embodiment of the present invention and its relationship with the HiGig message Relationship diagram. The corresponding meanings of each field in the Ethernet message are shown in Table 5:

field length meaning IPG 12B Ethernet frame gap, 12 bytes Preamble 8B Ethernet frame preamble MAC_DA 6B MAC address of the target board MAC_SA 6B Source board MAC address TPID 2B VLAN protocol type, 0x8100, the first two bytes of VLAN Header COS 4b Packet priority, the first 4 bits of the last two bytes of the VLAN Header VID 12b Packet VLAN ID, the last 12 bits of the last two bytes of the VLAN Header (it has no practical significance for 10 Gigabit Ethernet switch chips, such as fixed to 1) HiGig Header 12B HiGig head Packet_Data indeterminate Message payload (including the MAC header information of the original message) FCS 4B CRC checksum of the Ethernet frame after the update

table 5

Because the L2/L3 switching chips supporting the HiGig protocol all add standard HiGig headers in the HiGig message, so that other chips supporting the HiGig protocol can identify the HiGig message according to the HiGig header, in the embodiment of the present invention, in the When a HiGig packet is converted into an Ethernet packet, some information in the HiGig header has lost its meaning for identifying the HiGig packet, such as the field "START_OF_FRAME(SOF)" used to indicate the beginning of the HiGig packet, etc., so In order to effectively utilize the bandwidth and avoid invalid bytes occupying the length of the message, the HiGig header can be simplified, unnecessary bytes are omitted, and only the necessary information is retained. For example, the HiGig header is simplified from the original 12 bytes to Including the 6 bytes shown in Table 6, that is, Table 6 lists the composition and meaning of each field in a simplified HiGig header.

field length meaning SRC_MODID 7bit Source chip number DST_MODID 7bit Destination chip number VLAN 16bit VLAN information, including VLAN_PRI, VLAN_CFI, VID_HIGH, VID_LOW OPCODE 3bit Packet type, unicast or multicast, etc. PFM 2bit Port filtering mode, for multicast SRC_PORT_TGID 6bit source port number DEST_PORT 5bit destination port number COS 2bit service priority

Table 6

Of course, the content included in the simplified HiGig header is not limited to the content shown in Table 6, and may also be other content, which will not be listed here.

Correspondingly, after the interface conversion unit receives the HiGig message from the L2/L3 switching chip, it will first strip the standard HiGig header, and add a simplified HiGig header, and then encapsulate the found destination board MAC address in the in the MAC header in front of this simplified HiGig header. At this time, the HiGig header in the Ethernet packet format shown in the lower part of Figure 7 becomes a simplified HiGig header, and correspondingly, the 12-byte HiGig header in Table 5 also becomes a 6-byte HiGig header. Simplified HiGig header.

Further, in order to prevent message blocking, a buffer channel, such as a FIFO channel, can be set corresponding to each line card board in the interface conversion unit, for storing messages corresponding to the line card board; and a flow rate is set in the interface conversion unit The management control module is used to monitor the FIFO buffer status of each FIFO channel of the card board of this line, and regularly send flow control information, status information, resource allocation information, etc. The card board suspends sending data packets to the card board of this line. These information can be realized through specific control messages. The flow management control module of the interface conversion unit of the line card board is used to schedule the messages in the FIFO channel round-robin or based on priority.

Therefore, in order to indicate the message type, such as whether the message is a normal message or the above-mentioned specific control message for flow control, a corresponding message type field can be additionally set in the lower part of FIG. 7 . Alternatively, considering the limited number of line card boards connected to the routing and switching equipment in the embodiment of the present invention, the board MAC address used to identify each line card board can be fixedly configured without the need to use the source MAC address of the Ethernet message. Learning, in this case, the source board MAC address in the Ethernet message sent to the Ethernet switching unit is useless, so the 6 fields of the source board MAC address "MAC_SA" in the lower part of Figure 7 can be used byte to indicate the message type, in order to mark the source of the message, different message type identifiers can be set corresponding to the slot numbers or board numbers of different line card boards. As shown in Table 7, Table 7 shows a schematic diagram of the content of the message type field when the routing and switching device includes 9 line cards.

message type Byte 1 (Byte1) Byte 2 (Byte2) Byte 3 (Byte3) Byte 4 (Byte4) Byte 5 (Byte5) Byte 6 (Byte6) datagram 00 40～48 Identification bit Control message 00 C0～C8 00 00 00 type bit

Table 7

It can be seen from Table 7 that in this embodiment, the second-highest byte of the field corresponding to the MAC address of the source board is used to indicate the message type. For the case of 9 line card boards, in this embodiment, 40 to 48 are used to represent each line card board For data messages, C0~C8 are used to represent the control messages of each line card board, and other bytes can be reserved as reserved bits. In addition, as mentioned above, after the L2/L3 switching chip fails to look up the table, the message can be sent to the default line card board. Correspondingly, an identification bit needs to be added in the MAC header to indicate the destination line card board of the current message. It is the default line card board after the table lookup fails, so in this embodiment, when sending a data packet, the last byte of the field corresponding to the source board MAC address can be used as the identification bit. In addition, since the control message can represent information such as flow control information, status information, and resource allocation information, the last byte of the field corresponding to the source board MAC address can be used as the type bit to indicate the type of the current message , the message format specifically defined by different types of bits can be set according to the actual situation, and will not be described in detail here. In addition, there may be other forms of byte definitions, which will not be listed here.

Correspondingly, when the interface conversion unit converts the HiGig message into the Ethernet message, it can add corresponding content according to the type of the message in the field corresponding to the MAC address "MAC_SA" of the source board. For example, when the message to be sent is a data message, the highest 1 byte of the field corresponding to the MAC address of the source board can be changed to 0×00, and the next highest 1 byte is based on the slot number or board Change the serial number to one of 0×40~0×48 (when there are 9 line card slots), the content of the following 4 bytes is meaningless, and the last 1 byte indicates that the data packet is exchanged at L2/L3 Whether the table lookup fails when the chip performs table lookup and forwarding; when the message to be sent is a control message, the highest 1 byte of the source board MAC address can be changed to 0×00, and the next highest 1 byte is based on the The slot number or board number is changed to 0×C0～0×C8 (when there are 9 line card slots), the middle 3 bytes are meaningless and reserved as 0×00, and the last 1 byte indicates various control reports. type of text.

(2) The switching line card board receives the Ethernet message from the switching network through the interface conversion unit.

After receiving the message from the line card board, the Ethernet switching unit forwards the message to the destination line card board according to the MAC address of the destination board in the message.

If the destination line card board is a switching line card board, the interface conversion unit of the switching line card board receives the message from the Ethernet switching unit, strips the MAC header of the message, and restores the message to HiGig message, and pass the restored HiGig message to the L2/L3 switching chip. Wherein, if a simplified HiGig header is used in order to effectively utilize bandwidth, the interface conversion unit further strips the simplified HiGig header after stripping the MAC header of the message, and adds a standard HiGig header, thereby converting the message Restored to HiGig packets. In addition, the interface conversion unit also recognizes whether the message is a control message for flow control or an ordinary message according to the slot number or board number of the source line card carried in the source board MAC address field. The control message is processed by the module that implements the flow management function, and the module can use the identification bit of the 6th byte to judge the specific type of the control message.

After receiving the HiGig message from the interface conversion unit, the L2/L3 switching chip strips off the HiGig header in the message, and sends the message out from the corresponding port according to the destination port number in the HiGig header.

Through the description of (1) and (2) above, the processing process of the switching line card board in the embodiment of the present invention is described in detail. In specific implementation, the internal structure of the interface conversion unit in the switch line card board can have multiple specific implementation forms, two of which are listed below:

The first:

FIG. 8 shows a schematic diagram of an internal structure of an interface conversion unit. As shown in Figure 8, the interface conversion unit includes: a cache channel consistent with the total number of routing line card boards and switching line card boards, a first receiving and sending module, a second receiving and sending module, a flow management control module, and a first packet A modification module and a second message modification module.

Wherein, each buffer channel corresponds to a line card board, and includes a forward channel and a reverse channel, which are respectively used to store messages in two directions corresponding to the line card board.

The first receiving and sending module is used to receive the HiGig message from the L2/L3 switch chip, according to the purpose MOD ID in the message, send the message to the forward channel of the corresponding buffer channel; and receive the message from the first The second message modifies the message of the module, and sends the message to the L2/L3 switching chip.

The second receiving and sending module is used to receive the Ethernet message from the Ethernet switching unit, and sends the message to the reverse channel of the corresponding buffer channel according to the source board MAC address field in the message; and Receive the message from the first message modification module, and send the message to the Ethernet switching unit.

The flow management control module is used to monitor the cache status of each buffer channel of the local line card board, and regularly send control messages for flow control to other line card boards according to the monitored cache status The line card board sends the data message; schedules the message from the forward channel or the reverse channel of the corresponding buffer channel in round robin or based on priority, and provides the message scheduled from the forward channel to the first message modification module , providing the message invoked from the reverse channel to the second message modification module.

The first message modification module is used to receive the message provided by the flow management control module, strip the HiGig header in the message, and search for the MOD ID and board MAC stored in itself according to the purpose MOD ID in the message HiGig header Correspondence table of addresses, obtain destination board MAC address, encapsulate simplified HiGig header before described message, and described destination board MAC address is encapsulated in the MAC header that is positioned at the front of simplified HiGig header, constitutes Ethernet message , sending the Ethernet packet to the second receiving and sending module.

Wherein, if the simplified HiGig header is not used in the embodiment, the first message modification module does not strip the HiGig header of the message after receiving the message provided by the flow management control module, but after obtaining the MAC address of the destination board, Directly encapsulate the MAC address of the target board in the MAC header located in front of the HiGig header to form an Ethernet packet.

The second message modification module is used to receive the message provided by the traffic management control module, strip the MAC header and the simplified HiGig header in the message, add a standard HiGig header to the message, and restore it to a HiGig message , sending the HiGig message to the first receiving and sending module.

Wherein, if the simplified HiGig header is not used in the embodiment, after receiving the message provided by the traffic management control module, the second message modification module only strips the MAC header in the message to complete the restoration of the HiGig message.

The second type:

Fig. 9 shows another schematic diagram of the internal structure of the interface conversion unit. As shown in Figure 9, the interface conversion unit also includes: a cache channel consistent with the total number of routing line card boards and switching line card boards, a first receiving and sending module, a second receiving and sending module, a flow management control module, a first report The document modification module and the second message modification module, only the connection relationship between the modules has changed. details as follows:

Each buffer channel corresponds to a line card board, and includes a forward channel and a reverse channel, which are respectively used to store messages in two directions corresponding to the line card board.

The flow management control module is used to monitor the cache status of each buffer channel of the local line card board, and regularly send control messages for flow control to other line card boards according to the monitored cache status The line card board sends the data message; schedules the message from the forward channel or the reverse channel of the corresponding buffer channel in round robin or based on priority, and provides the message scheduled from the forward channel to the second receiving and sending module, Provide the message invoked from the reverse channel to the first receiving and sending module.

The first receiving and sending module is used to receive the HiGig message from the L2/L3 switching chip, and send the message to the first message modification module; receive the message scheduled by the flow management control module, and send the message to L2/L3 switch chip.

The first message modification module is used to receive the HiGig message from the first receiving and sending module, strips the HiGig header in the message, searches the MOD ID and stored in itself according to the purpose MOD ID in the message HiGig header Board MAC address correspondence table, obtain destination board MAC address, encapsulate simplified HiGig head before described message, and described destination board MAC address is encapsulated in the MAC head that is positioned at the front of described HiGig head, constitutes Ethernet message, and send the Ethernet message to the forward channel of the corresponding buffer channel according to the MAC address of the destination board.

Wherein, if the simplified HiGig header is not used in the embodiment, the first message modification module does not strip the HiGig header of the message after receiving the message provided by the flow management control module, but after obtaining the MAC address of the destination board, Directly encapsulate the MAC address of the target board in the MAC header located in front of the HiGig header to form an Ethernet packet.

The second receiving and sending module is used to receive the Ethernet message from the Ethernet switching unit, and send the message to the second message modification module; receive the message scheduled by the flow management control module, and send the message to the Ethernet switching unit;

The second message modification module is used to receive the Ethernet message from the second receiving and sending module, strip the MAC header and the simplified HiGig header in the message, and add a standard HiGig header to the message to form a HiGig message , sending the HiGig message to the reverse channel of the corresponding cache channel according to the source MOD ID in the message.

Wherein, if the simplified HiGig header is not used in the embodiment, after receiving the message provided by the traffic management control module, the second message modification module only strips the MAC header in the message to complete the restoration of the HiGig message.

In addition, since the physical interface of the L2/L3 switch chip supporting the HiGig protocol is an XAUI interface, and the XAUI interface is a serial interface, in order to facilitate Ethernet packet processing, the XAUI interface can be converted to an XGMII interface (10 Gigabit media-independent interface), the XGMII interface is a parallel interface.

For this reason, the internal structure of the first receiving and sending module of the interface conversion unit may be shown in FIG. 10 , including: a first serial-to-parallel conversion module and a first adaptation identification module.

Wherein, the first serial-to-parallel conversion module is used to receive the message from the L2/L3 switching chip through the XAUI interface, and transmit the message to the first adaptation identification module through the parallel XGMII interface; The first adaptation identifies the message of the module, and transmits the message to the L2/L3 switch chip through the serial XAUI interface.

The first adaptation identification module is configured to adapt and identify the HiGig message sent by the first serial-to-parallel conversion module and the HiGig message sent by other modules. Wherein, for the interface conversion unit shown in FIG. 8 , the other modules here refer to the flow management control module; for the interface conversion unit shown in FIG. 9 , the other modules here refer to the second packet modification module.

Of course, in the case of a short wiring length, the above-mentioned first serial-to-parallel conversion module may not be required.

In addition, the Ethernet switching unit in the embodiment of the present invention may be various types of Ethernet switching units, for example, may be a 10 Gigabit Ethernet switching unit or a Gigabit Ethernet switching unit.

Taking the case where the Ethernet switching unit is a 10 Gigabit Ethernet switching unit as an example, the Ethernet switching unit is connected to the routing line card board and the switching line card board through the XAUI interface. In order to facilitate the processing of Ethernet messages, you can Convert that XAUI interface to an XGMII interface.

For this reason, the internal structure of the second receiving and sending module of the interface conversion unit may be shown in FIG. 11 , including: a second serial-to-parallel conversion module and a second adaptation identification module.

Wherein, the second serial-to-parallel conversion module is used to receive the message from the Ethernet switching unit through the serial XAUI, and pass the message to the second adaptation identification module through the parallel XGMII interface; The second adaptation identifies the message of the module, and sends the message to the Ethernet switching unit through the serial XAUI interface.

The second adaptation identification module is used for adapting and identifying the Ethernet message sent by the second serial-to-parallel conversion module and the Ethernet message sent by other modules. Wherein, for the interface conversion unit shown in FIG. 8 , the other modules here refer to the flow management control module; for the interface conversion unit shown in FIG. 9 , the other modules here refer to the first packet modification module.

In addition, if the Ethernet switching unit is another Ethernet switching unit such as a Gigabit Ethernet switching unit, the XAUI and XGMII in the second receiving and sending module are changed accordingly, and the XAUI and XGMII in the first receiving and sending module are also changed accordingly ; In addition, the first serial-to-parallel conversion module needs to complete rate matching with the L2/L3 switching chip.

The switching line card in the embodiment of the present invention has been described in detail above, and the routing line card in the embodiment of the present invention will be described in detail below:

The routing forwarding table in the routing line card board also includes the corresponding relationship between the destination IP address and the purpose MOD ID (such as DST_MODID) shown in the three-layer forwarding table similar to Table 1, and also stores similar information in the routing line card board. Table 2 and Table 3 show the correspondence between the MOD ID and the board MAC address, and the correspondence between the board MAC address or MOD ID and the line card board type. Wherein, the corresponding relationship table between MOD ID and board MAC address and/or the corresponding relationship table between board MAC address or MOD ID and the line card board type can also include the slot number or card number of the source line card board.

After the routing line card board receives the message from the outside, it checks its own routing forwarding table according to the destination address of the message, and if the table lookup shows that the message is sent through its own egress port, it sends the message directly; if The table lookup shows that the message is sent through other line card boards, then according to the purpose MODID obtained from the table lookup, look up the corresponding relationship table between the MOD ID and the board MAC address, and the corresponding relationship table between the board MAC address or MOD ID and the line card board type, Obtain the board MAC address and line card type, if the line card type shows that the destination line card is another routing line card, then process according to the prior art, that is, add the board MAC address and port number in the message The outbound port information and other cross-board forwarding information, after encapsulating the message, forward it to other routing line cards through the Ethernet switching unit; if the line card type shows that the destination line card is a switching line card, then the routing line The card board encapsulates information such as the destination MOD ID and destination port number in the HiGig header located in front of the Ethernet message, and encapsulates the MAC address of the destination board in the MAC header located in front of the HiGig header to form an Ethernet message. send the Ethernet packet to the Ethernet switching unit.

After the routing line card board receives the Ethernet message from the Ethernet switching unit, according to the source board MAC address field in the message (such as the slot number or card number of the source line card board in the source board MAC address field, etc.) Look up the table to get the type of the source line card. If the type of the source line card shows that the message comes from another routing line card, the message will be processed according to the existing technology, that is, the outgoing port information of the message will be stripped , after completing other services forwarded across boards, send the message on the corresponding port; if the type of the source line card shows that the message comes from the switching line card, the routing line card will strip the message after receiving the message. MAC header and HiGig header of the message, and send the message from the corresponding port according to the destination port number in the HiGig header.

Wherein, if a simplified HiGig header is used for effective bandwidth utilization, the HiGig header encapsulated in front of the Ethernet message by the routing line board and the HiGig header stripped from the Ethernet message are all simplified HiGig headers.

In addition, if the routing line card is the default routing line card sent after the switching line card fails to look up the table, after receiving the Ethernet packet forwarded by the Ethernet switching unit, the line card will The default identification bit, such as the identification bit corresponding to the sixth byte of the source board MAC address field, after judging that it is the default routing line card, strip the MAC header and HiGig header of the message, and then send the message It is processed as a new message from the outside. That is, according to the destination address of the message, processing such as checking its own routing and forwarding table is performed.

If the routing line card recognizes that the packet is a control packet for flow control according to the MAC address field of the source board, the control packet can be handed over to the unit that implements the flow management function for processing. This unit uses the 6th byte The identification bit determines the specific control message type.

The routing switching device in the embodiment of the present invention has been described in detail above, and the routing switching method in the embodiment of the present invention will be described in detail below.

The routing switching method in the embodiment of the present invention is applied to a routing switching device including a routing line card board and a switching line card board, wherein the routing switching device includes an Ethernet switching unit, and the Ethernet switching unit can be set in the routing switching device In the main control board, it can also be set separately in the switch board, etc., and the switch line card board includes L2/L3 switch chips.

Wherein, the switching line card board forwards messages to other switching line card boards or routing line card boards through the Ethernet switching unit, and receives messages from other switching line card boards or routing line card boards through the Ethernet switching unit; The card board forwards messages to other routing line card boards or switching line card boards through the Ethernet switching unit, and receives messages from other routing line card boards or switching line card boards through the Ethernet switching unit.

During specific implementation, the L2/L3 switch chip may be a switch chip supporting the Ethernet protocol, or may be a switch chip supporting other protocols. The routing switching method in the embodiment of the present invention will be described below by taking the L2/L3 switching chip as an example of the L2/L3 switching chip supporting the HiGig protocol.

FIG. 12 shows a flow chart of a switching line card board receiving an external message and forwarding it to other line card boards through an Ethernet switching unit. As shown in Figure 12, the process includes the following steps:

Step 1201, the L2/L3 switch chip of the switch line card board receives the Ethernet message from the outside.

Step 1202, the L2/L3 switching chip checks the L2/L3 forwarding table according to the destination address of the message.

Step 1203, if cross-board forwarding is required, judge whether to find the destination MOD ID and destination port number that need cross-board forwarding, if found, execute step 1204; otherwise, execute step 1205.

Step 1204, encapsulating the destination MOD ID and destination port number in the HiGig header in front of the Ethernet message to form a HiGig message. After that, step 1206 is executed.

Step 1205, encapsulating the preset specific purpose MOD ID and destination port number in the HiGig header in front of the Ethernet message to form a HiGig message.

Step 1206, the L2/L3 switching chip sends the formed HiGig message to the interface conversion unit.

Step 1207, the interface conversion unit searches the correspondence table between the MOD ID and the board MAC address stored in itself according to the destination MOD ID in the HiGig header of the message, and obtains the destination board MAC address.

Step 1208, the interface conversion unit encapsulates the MAC address of the target board in the MAC header located in front of the HiGig header to form an Ethernet message.

Step 1209, sending the Ethernet packet to the Ethernet switching unit.

Wherein, if the purpose MOD ID in the step 1207 is a preset specific purpose MOD ID, then in this step, when the interface conversion unit adds the MAC header information, an identification bit can be added in the MAC header to represent the current message The destination line card is the default line card after the table lookup fails.

After receiving the above message from the interface conversion unit, the Ethernet switching unit sends the message to the corresponding switching line card board or routing line card board according to the MAC address of the destination board in the MAC header of the message.

Wherein, consistent with the routing and switching equipment in this embodiment, if a simplified HiGig header is used in order to effectively utilize the bandwidth, the interface conversion unit performs step 1208 before receiving the HiGig message from the L2/L3 switching chip. , the standard HiGig header in the packet will be stripped first, and the simplified HiGig header will be added. This process may be performed before step 1207 is performed, or after step 1207 is performed. Then, in step 1208, the found MAC address of the destination board is encapsulated in the MAC header located in front of the simplified HiGig header.

Further, if the interface conversion unit is provided with a cache channel and a traffic management control module, corresponding to the structure of the interface conversion unit shown in FIG. 8 , in this process, between steps 1206 and 1207, it may further include: The interface conversion unit sends the message to the forward channel of the corresponding buffer channel according to the destination board information in the message, such as the destination MOD ID. Step 1206B, the flow management control module schedules the packets in the forward channel of a buffer channel in round robin or based on priority. Then in step 1207, the message scheduled by the flow management control module is processed.

Corresponding to the structure of the interface conversion unit shown in Figure 9, in this process, between step 1208 and step 1209, it may further include: step 1208A, the interface conversion unit will report the target board information according to the purpose board information in the message, such as the board MAC address The text is sent to the forward channel of the corresponding cache channel. Step 1208B, the flow management control module schedules the packets in the forward channel of a buffer channel in round robin or based on priority. Then in step 1209, the message scheduled by the flow management control module is sent.

Fig. 13 shows the flow chart of the switching line card board receiving other line card board messages through the Ethernet switching unit. As shown in Figure 13, the process includes the following steps:

Step 1301, the interface conversion unit of the switch line card board receives the message from other switch line card boards or routing line card boards forwarded by the Ethernet switch unit.

Step 1302, the interface conversion unit strips off the MAC header of the message, and restores the message to a HiGig message.

Step 1303, delivering the restored HiGig message to the L2/L3 switching chip.

Step 1304: After receiving the HiGig message from the interface conversion unit, the L2/L3 switching chip strips off the HiGig header in the message, and sends the message out from the corresponding port according to the destination port number in the HiGig header.

Wherein, if a simplified HiGig header is used in order to effectively utilize the bandwidth, then in step 1302, the interface conversion unit further strips the simplified HiGig header after stripping the MAC header of the message, and adds a standard HiGig header, In this way, the message is restored to a HiGig message.

In addition, before step 1302, the interface conversion unit also identifies whether the message is a control message for flow control or an ordinary message according to the slot number or board number of the source line card carried in the source board MAC address field. The control message for flow control is handed over to the module that implements the flow management function for processing, and the module can use the identification bit of the 6th byte to judge the specific type of the control message.

Further, if the interface conversion unit is provided with a buffer channel and a flow management control module, corresponding to the structure of the interface conversion unit shown in FIG. 8 , in this process, between steps 1301 and 1302, it may further include: The interface conversion unit sends the message to the forward channel of the corresponding buffer channel according to the source board information in the message, such as the source board MAC address field (such as the slot number or board number in the source board MAC address field). Step 1301B, the traffic management control module schedules the packets in the forward channel of a buffer channel in round robin or based on priority. Then in step 1302, the message scheduled by the flow management control module is processed.

Corresponding to the structure of the interface conversion unit shown in Figure 9, in this process, between step 1302 and step 1303, may further include: step 1302A, interface conversion unit according to the source board information in the message, as source MOD ID, will report The text is sent to the forward channel of the corresponding cache channel. Step 1302B, the flow management control module schedules the packets in the forward channel of a buffer channel in round robin or based on priority. Then in step 1303, the message scheduled by the flow management control module is sent.

FIG. 14 shows a flow chart of the routing line card board receiving an external message and forwarding it to other line card boards through the Ethernet switching unit. As shown in Figure 14, the process includes the following steps:

Step 1401, the routing line card board receives the Ethernet message from the outside.

Step 1402, the routing line board checks the routing and forwarding table according to the destination address of the message.

Step 1403, according to the purpose MOD ID obtained by looking up the table, look up the corresponding relationship table between MOD ID and board MAC address, and the corresponding relationship table between board MAC address or MOD ID and the line card board type, and obtain the purpose board MAC address and the line card board type.

Step 1404, determine whether the line card type indicates that the destination line card is another routing line card, if yes, perform step 1405; otherwise, perform step 1406.

Step 1405, process according to the prior art. That is, add the outgoing port information including the MAC address of the destination board, the port number and other cross-board forwarding information in the message, after the message is encapsulated, forward it to other routing line card boards through the Ethernet switching unit, and end this process.

Step 1406, the routing line card board encapsulates information such as the purpose MOD ID and the purpose port number in the HiGig header positioned in front of the Ethernet message, and encapsulates the MAC address of the target board in the MAC header positioned in front of the HiGig header , forming an Ethernet packet.

Step 1407, sending the Ethernet packet to the Ethernet switching unit.

Wherein, if a simplified HiGig header is used for effective bandwidth utilization, the HiGig header encapsulated in front of the Ethernet packet by the routing line card in step 1406 is a simplified HiGig header.

FIG. 15 shows a flow chart of a routing line card board receiving messages from other line card boards through an Ethernet switching unit. As shown in Figure 15, the process includes the following steps:

Step 1501, the routing line card board receives the Ethernet message from the Ethernet switching unit.

Step 1502, look up the table according to the source board MAC address field in the message (such as the slot number or card number of the source line card in the source board MAC address field), and obtain the type of the source line card.

Step 1503, according to the type of the source line card, it is judged whether the packet comes from the routing line card, if yes, execute step 1504; otherwise, execute step 1505.

Step 1504, process the message according to the prior art. That is, the outgoing port information of the message is stripped, and after other services of cross-board forwarding are completed, the message is sent on the corresponding port. End this process.

Step 1505, the routing line board strips the MAC header and the HiGig header of the packet.

Step 1506, the routing line board sends the message out from the corresponding port according to the destination port number in the HiGig header.

Wherein, if the simplified HiGig header is adopted for effective bandwidth utilization, the HiGig header stripped by the routing line board from the Ethernet packet in step 1505 is the simplified HiGig header.

In addition, step 1505 may further include: according to the identification bit in the source board MAC address field in the message, judging whether it is the default line card after the switch line card fails to look up the table, if not, perform step 1506. Otherwise, the routing line card processes the message as a new message from outside. That is, according to the destination address of the message, processing such as checking its own routing and forwarding table is performed.

Further, between step 1501 and step 1502, it may further include: the routing line card board identifies whether the message is a control message for flow control according to the source board MAC address field, and if so, may hand over the control message to the Implement the unit processing of the traffic management function; otherwise, execute step 1502 .

The aforementioned Ethernet switching unit may be a 10 Gigabit Ethernet switching unit or a Gigabit Ethernet switching unit.

In the embodiment of the present invention, the data exchange is accelerated through the combination of organic hardware and software, and the management quantity of the equipment is reduced, and the maintainability is improved.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (19)

1. route exchange device, comprising: Ethernet crosspoint and route line card plate is characterized in that this equipment also comprises: comprise the three layers of L3 exchange chip of two layers of L2/ of supporting the HiGig agreement and the switched line clamp of interface conversion unit, wherein,

Between the switched line clamp, carry out message forwarding by the Ethernet crosspoint between switched line clamp and the route line card plate, described switched line clamp carries out the transmitting-receiving of message by interface conversion unit and Ethernet crosspoint;

Described L2/L3 exchange chip is used to receive the Ethernet message from the outside, looking into L2/L3 according to the destination address of described message transmits, if find the purpose chip number MOD ID and the destination slogan that need straddle to transmit, then described purpose MOD ID and destination slogan are encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit; Reception is peeled off the HiGig head in the described message from the HiGig message of interface conversion unit, and according to the destination slogan in the described HiGig head message is sent from the corresponding port;

Described interface conversion unit is used to receive the HiGig message from described L2/L3 exchange chip, search the MOD ID that stores in self and the mapping table of plate media access control MAC address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to the Ethernet crosspoint; Reception is peeled off the MAC head of described message from the Ethernet message of Ethernet crosspoint, and described message is reduced to the HiGig message, and described HiGig message is passed to described L2/L3 exchange chip;

Described route line card plate is used to receive the message from the outside, look into the route forwarding table of storing in self that comprises purpose MOD ID according to the destination address of described message, if find the purpose MOD ID and the destination slogan that need be transmitted to the switched line clamp, then described purpose MOD ID and destination slogan are encapsulated in the HiGig head that is arranged in Ethernet message front, search the MOD ID that stores in self and the mapping table of plate MAC Address according to described purpose MOD ID, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to the Ethernet crosspoint; Receive the Ethernet message that the Ethernet crosspoint is transmitted, peel off the MAC head and the HiGig head of described message, and message is sent from the corresponding port according to the destination slogan in the described HiGig head from the switched line clamp;

Described Ethernet crosspoint is used to receive the Ethernet message of switched line clamp and route line card plate, and the purpose plate MAC Address according in the described message is transmitted to corresponding cable card board with described message.

2. equipment as claimed in claim 1, it is characterized in that, described L2/L3 exchange chip is when looking into L2/L3 according to the destination address of message and transmit, if search less than corresponding target MOD ID and destination slogan, then specific purpose MOD ID and the destination slogan that sets in advance is encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit;

Described interface conversion unit is after receiving described HiGig message, if the purpose MODID in the described message is described specific MOD ID, then find plate MAC Address to the default route cable card board that should MOD ID be provided with according to this MOD ID, described purpose plate MAC Address and corresponding default identification are encapsulated in the MAC head that is arranged in a described HiGig front, the Ethernet message that constitutes is sent to the Ethernet crosspoint;

After described default route cable card board receives the described Ethernet message of Ethernet crosspoint forwarding, according to the default identification position in the described MAC head, behind the MAC head of peeling off described message and HiGig head, described message is handled as the message from the outside.

3. equipment as claimed in claim 2 is characterized in that, described interface conversion unit is carried at described default identification position in the source plate MAC Address field in the MAC head.

4. equipment as claimed in claim 1, it is characterized in that, after described interface conversion unit receives HiGig message from described L2/L3 exchange chip, described purpose plate MAC Address is encapsulated in before the MAC head that is arranged in a described HiGig front, further the HiGig head in the described message is peeled off, and the HiGig head after the interpolation simplification; Described interface conversion unit is reduced to described message before the HiGig message after peeling off the MAC head of described message, peels off the HiGig head after the described simplification further, and adds the HiGig head of standard;

Described route line card plate is encapsulated in HiGig head that is arranged in Ethernet message front and the HiGig head of HiGig head for simplifying of peeling off from the Ethernet message.

5. equipment as claimed in claim 4, it is characterized in that, described interface conversion unit comprises: the buffer memory passage, first consistent with route line card plate and switched line clamp sum quantity receives sending module, second and receives sending module, traffic management control module, first message change module and second message change module, wherein

Cable card board of correspondence of each buffer memory passage, and comprise forward path and backward channel, be respectively applied for the message of the corresponding cable card board both direction of storage;

The described first reception sending module is used to receive the HiGig message from the L2/L3 exchange chip, according to the purpose MOD ID in the described message, described message is sent in the forward path of respective cache passage; And receive the message of changing module from second message, described message is sent to the L2/L3 exchange chip;

The described second reception sending module is used to receive the Ethernet message from the Ethernet crosspoint, and the source plate MAC Address field according in the described message sends to described message in the backward channel of corresponding buffer memory passage; And receive the message of changing module from first message, described message is sent to the Ethernet crosspoint;

Described traffic management control module is used for repeating query or dispatches message based on priority ground from the forward path or the backward channel of respective cache passage, the message that to dispatch from forward path offers first message change module, and the message that will call from backward channel offers second message change module;

Described first message change module is used to receive the message of described traffic management control module scheduling, peel off the HiGig head in the described message, search the MOD ID that stores in self and the mapping table of plate MAC Address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, the HiGig head that encapsulation is simplified before described message, and described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to second receive sending module;

Described second message change module is used to receive the message of described traffic management control module scheduling, peel off the MAC head in the described message and the HiGig head of simplification, in message, add the HiGig head of standard, restore the HiGig message, described HiGig message is sent to first receive sending module.

6. equipment as claimed in claim 4, it is characterized in that, described interface conversion unit comprises: the buffer memory passage, first consistent with route line card plate and switched line clamp sum quantity receives sending module, second and receives sending module, traffic management control module, first message change module and second message change module, wherein

Cable card board of correspondence of each buffer memory passage, and comprise forward path and backward channel, be respectively applied for the message of the corresponding cable card board both direction of storage;

Described traffic management control module is used for repeating query or dispatches message based on priority ground from the forward path or the backward channel of respective cache passage, the message that to dispatch from forward path offers second and receives sending module, and the message that will call from backward channel offers first and receives sending module;

The described first reception sending module is used to receive the HiGig message from the L2/L3 exchange chip, and described message is sent to first message change module; Receive the message of traffic management control module scheduling, described message is sent to the L2/L3 exchange chip;

Described first message change module is used to receive the HiGig message from the first reception sending module, peel off the HiGig head in the described message, search the MOD ID that stores in self and the mapping table of plate MAC Address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, the HiGig head that encapsulation is simplified before described message, and described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, according to described purpose plate MAC Address, described Ethernet message is delivered in the forward path of respective cache passage;

The described second reception sending module is used to receive the Ethernet message from the Ethernet crosspoint, and described message is sent to second message change module; Receive the message of traffic management control module scheduling, described message is sent to the Ethernet crosspoint;

Described second message change module is used to receive the Ethernet message from the second reception sending module, peel off the MAC head in the described message and the HiGig head of simplification, in message, add the HiGig head of standard, restore the HiGig message, source MOD ID according in the described message sends to described HiGig message in the backward channel of corresponding buffer memory passage.

7. as each described equipment in the claim 4 to 6, it is characterized in that, comprise in the HiGig head of described simplification:

Source MOD ID, purpose MOD ID, virtual LAN VLAN information, type of message, source port number and destination slogan.

8. equipment as claimed in claim 5, it is characterized in that, the traffic management control module of described interface conversion unit is further used for monitoring each buffer memory passage buffer storage state of this cable card board, according to the buffer status that monitors, regularly sends the control message that is used for flow control to other cable card board;

Described first message change module is common message or the described control message that is used for flow control according to the type of message, the slot number of source cable card board of corresponding described type or plate number are set in described source plate MAC Address field, are used for identification sources cable card board and type of message thereof;

Described second receives sending module behind the message that receives from the Ethernet crosspoint, according to the slot number in the source plate MAC Address field in the described message MAC head or plate number, identify source cable card board and type of message thereof, if type of message is the control message that is used for flow control, then described message is sent to the traffic management control module of self; If type of message is common message, then described message is transferred to second message change module of self.

9. as claim 5 or 6 described equipment, it is characterized in that described first receives sending module comprises:

First string and the modular converter is used for ten thousand mbit ethernet Attachment Unit Interface XAUI by serial and receives message from the L2/L3 exchange chip, and described message is passed to the first adaptive identification module by 10,000,000,000 parallel media independent interface XGMII; Receive message by parallel XGMII interface, the XAUI interface of described message by serial is passed to the L2/L3 exchange chip from the first adaptive identification module;

The first adaptive identification module is used for carrying out adaptive and identification to first string and modular converter HiGig message that sends and the HiGig message that other module sends.

10. equipment as claimed in claim 9 is characterized in that, described Ethernet crosspoint is ten thousand mbit ethernet crosspoints, and described Ethernet crosspoint links to each other by ten thousand mbit ethernet Attachment Unit Interface XAUI with described route line card plate, switched line clamp;

Described second receives sending module comprises: second string and the modular converter and the second adaptive identification module, wherein,

Described second string and modular converter are used for XAUI by serial and receive message from the Ethernet crosspoint, and described message is passed to the second adaptive identification module by parallel XGMII; Receive message by parallel XGMII interface, the XAUI interface of described message by serial is sent to the Ethernet crosspoint from the second adaptive identification module;

The second adaptive identification module is used for carrying out adaptive and identification to second string and modular converter Ethernet message that sends and the Ethernet message that other module sends.

11. a switched line clamp is characterized in that, this switched line clamp comprises: three layers of L3 exchange chip of two layers of L2/ and the interface conversion unit of supporting the HiGig agreement;

Described L2/L3 exchange chip is used to receive the Ethernet message from the outside, looking into L2/L3 according to the destination address of described message transmits, if find the purpose plate numbering MOD ID and the destination slogan that need straddle to transmit, then described MOD ID and destination slogan are encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit; Reception is peeled off the HiGig head in the described message from the HiGig message of interface conversion unit, and according to the destination slogan in the described HiGig head message is sent from the corresponding port;

Described interface conversion unit is used to receive the HiGig message from described L2/L3 exchange chip, search the MOD ID that stores in self and the mapping table of plate media access control MAC address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to the Ethernet crosspoint; Reception is peeled off the MAC head of described message from the Ethernet message of Ethernet crosspoint, and described message is reduced to the HiGig message, and described HiGig message is passed to described L2/L3 exchange chip.

12. switched line clamp as claimed in claim 11, it is characterized in that, described L2/L3 exchange chip is when looking into L2/L3 according to the destination address of message and transmit, if search less than corresponding target MOD ID and destination slogan, then specific purpose MOD ID and the destination slogan that sets in advance is encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit;

Described interface conversion unit is after receiving described HiGig message, if the purpose MODID in the described message is described specific MOD ID, then find plate MAC Address to the default route cable card board that should MOD ID be provided with according to this MOD ID, described purpose plate MAC Address and corresponding default identification are encapsulated in the MAC head that is arranged in a described HiGig front, the Ethernet message that constitutes is sent to the Ethernet crosspoint.

13. switched line clamp as claimed in claim 11, it is characterized in that, described interface conversion unit comprises: the buffer memory passage, first consistent with route line card plate and switched line clamp sum quantity receives sending module, second and receives sending module, traffic management control module, first message change module and the second change module, wherein

Cable card board of correspondence of each buffer memory passage, and comprise forward path and backward channel, be respectively applied for the message of the corresponding cable card board both direction of storage;

The described first reception sending module is used to receive the HiGig message from the L2/L3 exchange chip, according to the purpose MOD ID in the described message, described message is sent in the forward path of respective cache passage; And receive the message of changing module from second message, described message is sent to the L2/L3 exchange chip;

The described second reception sending module is used to receive the Ethernet message from the Ethernet crosspoint, and the source plate MAC Address field according in the described message sends to described message in the backward channel of corresponding buffer memory passage; And receive the message of changing module from first message, described message is sent to the Ethernet crosspoint;

Described traffic management control module is used for repeating query or dispatches message based on priority ground from the forward path or the backward channel of respective cache passage, the message that to dispatch from forward path offers first message change module, and the message that will call from backward channel offers second message change module;

Described first message change module is used to receive the message that described traffic management control module provides, search the MOD ID that stores in self and the mapping table of plate MAC Address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to second receive sending module;

Second message change module is used to receive the message that described traffic management control module provides, and peels off the MAC head in the described message, restores the HiGig message, described HiGig message is sent to first receive sending module.

14. switched line clamp as claimed in claim 11, it is characterized in that, described interface conversion unit comprises: the buffer memory passage, first consistent with route line card plate and switched line clamp sum quantity receives sending module, second and receives sending module, traffic management control module, first message change module and the second change module, wherein

Cable card board of correspondence of each buffer memory passage, and comprise forward path and backward channel, be respectively applied for the message of the corresponding cable card board both direction of storage;

Described traffic management control module is used for repeating query or dispatches message based on priority ground from the forward path or the backward channel of respective cache passage, the message that to dispatch from forward path offers second and receives sending module, and the message that will call from backward channel offers first and receives sending module;

The described first reception sending module is used to receive the HiGig message from the L2/L3 exchange chip, and described message is sent to first message change module; Receive the message of traffic management control module scheduling, described message is sent to the L2/L3 exchange chip;

Described first message change module is used to receive the HiGig message from the first reception sending module, search the MOD ID that stores in self and the mapping table of plate MAC Address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, according to described purpose plate MAC Address, described Ethernet message is delivered in the forward path of respective cache passage;

The described second reception sending module is used to receive the Ethernet message from the Ethernet crosspoint, and described message is sent to second message change module; Receive the message of traffic management control module scheduling, described message is sent to the Ethernet crosspoint;

Described second message change module is used to receive the Ethernet message from the second reception sending module, peel off the MAC head in the described message, restore the HiGig message, the source MOD ID according in the described message sends to described HiGig message in the backward channel of corresponding buffer memory passage.

15. as claim 13 or 14 described switched line clamps, it is characterized in that, after described first message change module receives HiGig message from described L2/L3 exchange chip, described purpose plate MAC Address is encapsulated in before the MAC head that is arranged in a described HiGig front, further the HiGig head in the described message is peeled off, and the HiGig head after the interpolation simplification;

Described second message change module is reduced to described message before the HiGig message after peeling off the MAC head of described message, peels off the HiGig head after the described simplification further, and adds the HiGig head of standard.

16. route exchanging method, it is characterized in that, this method is applied to comprise in the route exchange device of route line card plate and switched line clamp, comprise the Ethernet crosspoint in the described route exchange device, described switched line clamp comprises L2/L3 exchange chip and the interface conversion unit of supporting the HiGig agreement, and this method comprises:

The switched line clamp E-Packets to other switched line clamp or route line card plate by interface conversion unit and Ethernet crosspoint, and by the message of Ethernet crosspoint and interface conversion unit reception from other switched line clamp or route line card plate;

The route line card plate E-Packets to other route line card plate or switched line clamp by the Ethernet crosspoint, and by the message of Ethernet crosspoint reception from other route line card plate or switched line clamp;

Described switched line clamp E-Packets to other switched line clamp or route line card plate by interface conversion unit and Ethernet crosspoint and comprises:

L2/L3 exchange chip in the switched line clamp receives the message from the outside, looking into L2/L3 according to destination address in the described message transmits, if find the purpose MOD ID and the destination slogan that need straddle to transmit, then described purpose MOD ID and destination slogan are encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit; Interface conversion unit is searched the MOD ID that stores in self and the mapping table of plate MAC Address according to the purpose MOD ID in the described message HiGig head, obtain purpose plate MAC Address, described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to the Ethernet crosspoint; The Ethernet crosspoint sends to corresponding switched line clamp or route line card plate according to the purpose plate MAC Address in the described message MAC head with described message;

Described switched line clamp comprises by the message that Ethernet crosspoint and interface conversion unit receive from other switched line clamp or route line card plate:

The interface conversion unit of switched line clamp receives the message from other switched line clamp or route line card plate that the Ethernet crosspoint is transmitted, peel off the MAC head of described message, described message is reduced to the HiGig message, the HiGig message after the reduction is passed to the L2/L3 exchange chip; The L2/L3 exchange chip peels off the HiGig head in the message, and according to the destination slogan in the HiGig head message is sent from the corresponding port after receiving HiGig message from interface conversion unit;

Described route line card plate E-Packets to other route line card plate or switched line clamp by the Ethernet crosspoint and comprises:

The route line card plate receives the Ethernet message from the outside, looks into route forwarding table according to the destination address of described message; The purpose MOD ID that obtains according to tabling look-up searches the mapping table of MOD ID and plate MAC Address, and the mapping table of plate MAC Address or MOD ID etc. and cable card board type, obtain plate MAC Address and cable card board type, when the cable card board type shows that the purpose cable card board is the switched line clamp, information such as purpose MOD ID and destination slogan are encapsulated in the HiGig head that is arranged in Ethernet message front, and described purpose plate MAC Address is encapsulated in the MAC head that is arranged in a described HiGig front, constitute the Ethernet message, described Ethernet message is sent to the Ethernet crosspoint; The Ethernet crosspoint sends to corresponding switched line clamp or route line card plate according to the purpose plate MAC Address in the described message MAC head with described message;

Described route line card plate comprises by the message that the Ethernet crosspoint receives from other route line card plate or switched line clamp:

The route line card plate receives the Ethernet message from the Ethernet crosspoint, table look-up according to the source plate MAC Address field in the message, obtain the type of source cable card board, at cable card board type explicit message during from the switched line clamp, peel off the MAC head and the HiGig head of described message, and message is sent from the corresponding port according to the destination slogan in the described HiGig head.

17. method as claimed in claim 16, it is characterized in that, described interface conversion unit is encapsulated in described purpose plate MAC Address before the MAC head that is arranged in a described HiGig front, further comprises: peel off the HiGig head of described HiGig message, and add the HiGig head after simplifying;

Described interface conversion unit further comprises after peeling off the MAC head of described message: peel off the HiGig head after described message is simplified, and add the HiGig head of standard;

Described route line card plate is encapsulated in the HiGig head of HiGig head for simplifying that is positioned at Ethernet message front;

The HiGig head of the HiGig head that described route line card plate is peeled off from the Ethernet message for simplifying.

18. method as claimed in claim 17, it is characterized in that, this method further comprises: the L2/L3 exchange chip is when looking into L2/L3 according to the destination address of message and transmit, if search less than corresponding target MOD ID and destination slogan, then specific purpose MOD ID and the destination slogan that sets in advance is encapsulated in the HiGig head that is arranged in Ethernet message front, constitute the HiGig message, described HiGig message is passed to interface conversion unit;

Described interface conversion unit is after receiving described HiGig message, find plate MAC Address according to this specific MOD ID to the default route cable card board that should MOD ID be provided with, described purpose plate MAC Address and corresponding default identification are encapsulated in the MAC head that is arranged in a described HiGig front, the Ethernet message that constitutes is sent to the Ethernet crosspoint;

After described default route cable card board receives the described Ethernet message of Ethernet crosspoint forwarding, according to the default identification position in the described MAC head, behind the MAC head of peeling off described message and HiGig head, described message is handled as the message from the outside.

19. method as claimed in claim 17, it is characterized in that, described interface conversion unit with purpose plate MAC Address be encapsulated in be arranged in HiGig front the MAC head before or afterwards, further comprise: interface conversion unit is according to the purpose plate information in the message, message is sent in the forward path of respective cache passage traffic management control module repeating query or based on the message in the forward path of certain buffer memory passage of priority ground scheduling;

Described interface conversion unit is reduced to message before the HiGig message or afterwards, further comprise: interface conversion unit is according to the source plate information in the message, message is sent in the forward path of respective cache passage traffic management control module repeating query or based on the message in the forward path of certain buffer memory passage of priority ground scheduling.

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