CN1863089A - Method for configurating slave node of virtual LAN - Google Patents

Abstract

The invention relates to the VLAN field, and discloses a VLAN slave node configuration method, so that the master node can remotely configure the VLAN to which the slave node belongs, and at the same time perform QoS scheduling on each MAC frame. In the present invention, the master node in the VLAN sends a MAC frame to the slave node, which carries the VLAN tag of the slave node, and the slave node sets the initial VLAN ID of the slave node according to the received VLAN tag, and establishes a connection with the master node. Two-way link connection, the master node further connects and assigns all the VLAN IDs of the slave node according to the instructions of the high-level application, and can add, delete or change these VLAN IDs, thus realizing the remote configuration and maintenance of the slave node, Reduced maintenance costs. Since all MAC frames communicated between the master node and the slave node carry VLAN tags, QoS scheduling for each MAC frame based on the VLAN tags can be realized.

Description

How to configure virtual local area network slave nodes

technical field

The invention relates to the field of virtual local area network, in particular to the automatic configuration technology of nodes in the virtual local area network.

Background technique

Local Area Network ("LAN" for short) refers to a private network that connects multiple computer terminals, databases and other equipment in a local area, such as schools, enterprises, etc., for internal information exchange. It is tens of meters to several kilometers, usually in a building or several adjacent buildings.

A LAN is usually defined as a separate broadcast domain, which mainly uses network devices such as hubs, bridges, or switches to connect all nodes in the same network segment. Network nodes in the same LAN can communicate directly without going through a network router; while communication between devices in different LAN segments must go through a network router.

VLAN is an emerging technology that realizes virtual workgroups by logically (rather than physically) dividing devices in a LAN into network segments, that is, VLAN technology allows network managers to logically divide a physical LAN into different broadcast domains (that is, VLANs).

VLAN is a very important Ethernet technology. Its most important function is to divide a large Ethernet into multiple small virtual Ethernets to solve the problem of Ethernet broadcast storms. Among them, each VLAN contains a group of computer workstations with the same requirements, and has the same attributes as the physically formed LAN. But because it is divided logically, each workstation in the same VLAN does not necessarily belong to the same physical LAN segment.

In addition, broadcast and unicast traffic within a VLAN will not be forwarded to other VLANs, which helps to control traffic, reduce equipment investment, simplify network management, and improve network security. Therefore, VLAN is also a protocol proposed to improve the security of Ethernet. It adds a VLAN header on the basis of Ethernet frames, and uses VLAN identification (Identity, referred to as "ID") to divide users into smaller tasks. Group, which restricts the Layer 2 gateway mutual access between users in different workgroups, and each workgroup is a VLAN. Access rights can be set in the gateway to ensure that authorized users can access specific VLANs.

According to the implementation method of VLAN on the switch, it can be roughly divided into four categories: VLAN based on port, VLAN based on MAC address, VLAN based on network layer and VLAN based on IP multicast. Among them, the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronics Engineers, referred to as "IEEE") 802.1Q stipulates an international standard for dividing VLANs based on ports of Ethernet switches. The VLAN tag is defined in IEEE802.1Q/P, and the VLAN tag contains the VLAN ID, which is the identification of the VLAN. The VLAN tag also has a Class of Service (Class of Service, referred to as "COS") field, which is used to implement media access control The Quality of Service ("QoS") function of the Medium Access Control ("MAC") layer can perform QoS scheduling for each MAC frame according to the COS field.

Specifically, the port-based VLAN division method is divided according to the ports of the Ethernet switch. For example, the switch has 24 ports, of which, 1-4 ports are VLAN 10; 5-17 are VLAN 20; 18-24 are VLAN 30 , Of course, these ports belonging to the same VLAN can be discontinuous. The specific configuration of each port of the switch is determined by the administrator. The same VLAN can span several Ethernet switches. For example, if there are multiple switches, ports 1-6 of switch 1 and ports 1-4 of switch 2 can be designated as the same VLAN. Classification according to ports is currently the most widely used method for defining VLANs. The advantage of this method of division is that the definition of VLAN members is simple, as long as all ports are defined; definition.

The VLAN division method based on the MAC address is divided according to the MAC address of each host, that is, the host with each MAC address is configured which group it belongs to.

The biggest advantage of this method for dividing VLANs is that when the user's physical location moves, that is, when changing from a switch to other switches, the VLAN does not need to be reconfigured. Therefore, it can be considered that this division method is based on users; the disadvantage of this method is that all users must be configured during initialization. If there are too many users, such as hundreds or even thousands of users, this configuration Complicated and costly. In addition, since there may be many VLAN group members on each port of the switch, broadcast packets in the VLAN cannot be limited, resulting in a reduction in the execution efficiency of the switch.

The VLAN division method based on the network layer is divided according to each user's network layer address or protocol type (if multiple protocols are supported). Although this method of division is based on network addresses, such as IP addresses, it has nothing to do with routing at the network layer, it just looks at the network address of each packet. However, because it is not based on routing, it is not based on routing protocols such as Routing Information Protocol (Routing Information Protocol, referred to as "RIP"), Open Shortest Path First Protocol (Open Shortest Path First, referred to as "OSPF"), but based on spanning tree algorithm Perform a bridge exchange.

The advantage of this method is that when the physical location of the user changes, the VLAN to which the user belongs does not need to be reconfigured. In addition, VLANs can be divided according to protocol types, which is very important for network managers. This method does not require additional frame tags to identify VLANs, and can also reduce network traffic.

The disadvantage of this method is that it is inefficient, because checking the network address of each data packet needs to consume a certain amount of processing time. The general switch chip can automatically check the Ethernet frame header of the data packet on the network, but if it needs to support the IP frame header, It requires the switch chip to adopt higher technology and spend more time-consuming detection.

According to the VLAN division method of IP multicast, that is to say, a multicast group is regarded as a VLAN. This method of division extends the VLAN to the Wide Area Network (Wide Area Network, referred to as "WAN"), so that its division can have greater flexibility, and it is also easy to expand through routers; but the disadvantage is that this method is not efficient , not suitable for LAN.

Based on the above advantages of VLAN, VLAN can be used to provide private network services, and differentiated services can also be provided at the MAC layer.

The network structure of implementing differentiated services using VLAN is shown in Figure 1, which includes a master node, a slave node, and a Layer 2 Ethernet in the middle.

Specifically, both the master node and the slave nodes use VLAN technology to form a virtual layer-2 Ethernet network. Before the master node and slave nodes communicate, the layer-2 Ethernet must establish a VLAN connection in advance. For the master node, according to the network planning, the VLAN information it belongs to can be obtained, so that the master node can send and receive MAC frames carrying VLAN tags; for the slave nodes, because there is no information about the VLAN they belong to, they cannot send and receive MAC frames carrying VLAN tags. There are mainly two solutions:

The first solution is that the slave node must pre-set the VLAN ID before communicating with the master node. This solution cannot achieve remote configuration of the slave node VLAN by the master node.

The second solution is to send and receive MAC frames that do not carry VLAN tags from the nodes. This solution cannot perform QOS scheduling for each MAC frame.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a configuration method of a virtual local area network slave node, so that the master node can remotely configure the VLAN to which the slave node belongs, and at the same time perform QoS scheduling on each MAC frame.

In order to achieve the above object, the invention provides a configuration method of a virtual local area network slave node, comprising the following steps:

The master node sends a MAC frame to the slave node, which carries the virtual local area network label information of the slave node;

The slave node sets the initial virtual local area network identifier of the slave node according to the virtual local area network label information in the received MAC frame.

Among them, the following steps are also included:

The slave node establishes a link connection between the slave node and the master node according to the initial virtual local area network identifier;

The master node assigns all virtual local area network identifiers of the slave nodes through the link connection.

Furthermore, in the method, the assigning includes adding, deleting, or changing the virtual local area network identifier of the slave node.

Furthermore, in the method, the assignment takes place via a higher layer of the master node and a higher layer of the slave node.

In addition, in the method, the master node sends the corresponding virtual local area network label information to all the slave nodes in the virtual local area network by broadcasting or multicasting.

In addition, in the method, the master node issues the label information of the virtual local area network to which the slave node belongs to all the slave nodes in a point-to-point manner.

In addition, in described method, also comprise following steps:

The master node and the slave node pre-set the link type as "Trunk" or "Hybrid".

In addition, in described method, also comprise following steps:

After the slave node accesses the network, it detects whether it receives a MAC frame carrying the VLAN label information from the master node, and if so, sets the initial virtual LAN identifier of the slave node.

By comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that the master node in the VLAN sends a MAC frame to the slave node, wherein the VLAN tag information of the slave node is carried, and the slave node according to the received MAC frame VLAN label information, set the initial VLAN ID of the slave node, and establish a bidirectional link connection with the master node, thereby realizing remote configuration of the VLAN to which the slave node belongs, and reducing the cost of VLAN networking configuration.

After the master node and the slave node establish a two-way link connection with the initial VLAN ID, the master node further assigns all the VLAN IDs of the slave node through the link connection according to the instructions of the upper layer, and can add and delete these VLAN IDs Or change operations, thereby realizing remote configuration and maintenance of slave nodes and reducing maintenance costs.

Since all MAC frames communicated between the master node and the slave node carry VLAN tag information, it is possible to realize remote configuration of the VLAN to which the slave node belongs and at the same time implement QoS scheduling for each MAC frame based on the VLAN tag information.

Description of drawings

FIG. 1 is a schematic diagram of a network structure using VLANs to implement differentiated services in the prior art;

Fig. 2 is a schematic diagram of Ethernet VLAN configuration structure in the prior art;

Fig. 3 is the flow chart of the configuration method of the VLAN slave node according to the first embodiment of the present invention;

Fig. 4 is a flow chart of a VLAN slave node configuration method according to the second embodiment of the present invention.

Detailed ways

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 accompanying drawings.

In the VLAN of the present invention, the master node sends a MAC frame to the slave node in a broadcast, multicast or point-to-point manner, which contains VLAN tag information to which the slave node belongs. The slave node sets its initial VLAN ID according to the received VLAN tag information, thereby establishing a two-way link connection with the master node. According to the established link connection, the master node can assign all the VLAN IDs of the slave node according to the network planning to realize the VLAN configuration for the slave node.

In order to support the MAC frame exchanged between the master node and the slave node to carry VLAN tag information, the master node and the slave node pre-set the link type to "Trunk" or "Hybrid" type, and set it to "Trunk" type Ethernet VLAN The configuration structure is shown in Figure 2, where each link can support multiple VLANs.

The configuration method of the VLAN slave node in the first embodiment of the present invention is shown in FIG. 3 . The master node and the slave node pre-set the link type as "Trunk" or "Hybrid", wherein each link can support multiple VLANs.

In step 301, when the master node system is started or the VLAN is set, since the master node can obtain each VLAN ID to which it belongs according to the network planning, and can know the slave nodes contained in each VLAN, the master node can be in each VLAN The MAC frame is delivered to each slave node of the VLAN in a broadcast or multicast manner, wherein the VLAN tag information of the slave node is carried.

In step 302, after the slave node accesses the network, in the initial state, the VLAN it belongs to is unknown, therefore, the slave node cannot generate a MAC frame with VLAN tag information, but can receive the frame carrying the VLAN tag sent by the Ethernet switch. MAC frame of information. Therefore, after the slave node accesses the network, it can detect whether it has received a MAC frame carrying VLAN tag information from the master node, and if so, proceed to step 303; otherwise, return to step 302 to continue detection.

In step 303, the slave node obtains the VLAN ID therein according to the VLAN tag information in the received MAC frame, and sets the slave node's initial VLAN ID according to the VLAN ID, and can also add the VLAN ID to the slave node simultaneously. The list of VLAN IDs supported by the node. Go to step 304.

In step 304, the slave node can utilize the initial VLAN ID to establish a two-way link connection with the master node, so that the master node can send a MAC frame carrying the VLAN tag information to realize communication with the master node, and the master node In the communication process with the slave node, the remote configuration of the VLAN to which the slave node belongs can be further realized, thereby reducing the configuration cost of VLAN networking.

In step 305, according to the network planning, the master node judges whether VLAN assignment needs to be performed on the slave node, and if so, proceeds to step 306; otherwise, returns to step 305. According to the planning of the network, the slave node may belong to one or more VLANs, but in step 304 only one initial VLAN ID is configured, so further assignment is required. For example, when a slave node belongs to multiple VLANs at the same time, the VLAN ID to which the slave node belongs needs to be increased; when the number of VLANs to which the slave node belongs decreases due to network planning changes, the VLAN ID of the corresponding slave node needs to be deleted; when the VLAN ID changes, It is also necessary to change the VLAN ID of the corresponding slave node.

In step 306, the master node may assign the slave nodes through its high layer. Specifically, the assigned information is sent to the high layer of the slave node, and the high layer specific entity of the slave node assigns the VLAN of the slave node. Through assignment, the VLAN to which the slave node belongs can be flexibly configured. Of course, the initial VLAN ID of the slave node can also be modified. Specifically, assignment includes adding, deleting, or changing the VLAN ID of the slave node, thereby realizing remote configuration and maintenance of the slave node and reducing VLAN maintenance costs. Go to step 307.

In step 307, the slave node detects whether its upper layers have received VLAN assignment information from the master node, and if so, proceeds to step 308; otherwise, returns to step 307 to continue detection.

In step 308, the slave node modifies the list of VLAN IDs supported by the slave node accordingly according to its high-level assignment. End this process.

The configuration method of the VLAN slave node according to the second embodiment of the present invention is shown in FIG. 4 . The master node and the slave node also pre-set the link type as "Trunk" or "Hybrid", wherein each link can support multiple VLANs.

In step 401, the master node periodically sends a MAC frame to a slave node whose initial VLAN ID has not been successfully set in a point-to-point manner, wherein the slave node carries VLAN tag information. Because through the network planning information, the master node can know the attributes of each slave node subordinate to it, as long as there is a slave node that has not successfully set the initial VLAN ID, it will periodically send a MAC with VLAN tag information to the slave node frame. In addition, since the VLAN master node needs to send the MAC frame cyclically, compared with the broadcast or multicast method, this point-to-point method is more applicable when there are fewer VLAN slave nodes; In this case, too many VLAN master node resources will be occupied, so it is not recommended.

Steps 402 to 408 are similar to steps 302 to 308 respectively, and will not be repeated here.

In the above embodiment, since all MAC frames communicated between the master node and the slave node carry VLAN tag information, it is possible to implement remote configuration of the VLAN to which the slave node belongs and at the same time realize the configuration of each MAC frame based on the VLAN tag information. QoS scheduling.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention.

Claims (8)

1. a configuration method of virtual local area network from node, is characterized in that, comprises the following steps: The master node sends a MAC frame to the slave node, which carries the virtual local area network label information of the slave node; The slave node sets the initial virtual local area network identifier of the slave node according to the virtual local area network label information in the received MAC frame. 2. the configuration method of virtual local area network according to claim 1, is characterized in that, also comprises the following steps: The slave node establishes a link connection between the slave node and the master node according to the initial virtual local area network identifier; The master node assigns all virtual local area network identifiers of the slave nodes through the link connection. 3. The method for configuring a virtual local area network slave node according to claim 2, wherein said assigning includes adding, deleting, or changing the virtual local area network identifier of the slave node. 4. The method for configuring a virtual local area network slave node according to claim 3, wherein the assignment is performed through a high layer of the master node and a high layer of the slave node. 5. The configuration method of a virtual local area network slave node according to claim 1, wherein the master node sends the corresponding virtual local area network to all the slave nodes in the virtual local area network by broadcasting or multicasting. LAN label information. 6 . The method for configuring a virtual local area network slave node according to claim 1 , wherein the master node issues the virtual local area network label information to which the slave node belongs to all the slave nodes in a point-to-point manner. 7. according to the configuration method of virtual local area network described in any one in claim 1 to 6, it is characterized in that, also comprise the following steps: The master node and the slave node pre-set the link type as "Trunk" or "Hybrid". 8. the configuration method of virtual local area network according to claim 7, is characterized in that, also comprises the following steps: After the slave node accesses the network, it detects whether it receives a MAC frame carrying the VLAN label information from the master node, and if so, sets the initial virtual LAN identifier of the slave node.

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