CN105024836B - A switching method, device and SR of an active service router SR and a standby SR - Google Patents

Abstract

The present invention provides a method, device and SR for switching between an active service router SR and a standby SR. The method is used in a metropolitan area network using a shared gateway, and the method includes: according to the configuration mode of the optical line terminal OLT, Detect whether the state of the link between the active SR and the OLT is available through a corresponding protocol, wherein, when the OLT adopts a dual uplink configuration, the protocol is the Ethernet connectivity fault management ETH-CFM protocol , when the OLT adopts a single uplink configuration, the protocol is the link aggregation control protocol LACP; when the state of the link between the active SR and the OLT is unavailable, the active SR is replaced by the active SR. The state is switched to the standby state; the standby SR is notified to switch from the standby state to the active state. By adopting the technical scheme provided by the present invention, the switching between the main and standby SRs can be automatically realized according to the link communication state, without manual intervention, and the switching efficiency of the main and standby SRs is improved.

Description

A switching method, device and SR of an active service router SR and a standby SR

technical field

The present invention relates to the field of communications, and in particular, to a method, device and SR for switching between an active service router SR and a standby SR.

Background technique

According to different access modes, the access layer and the convergence layer of the metropolitan area network also correspond to different topological structures. SR (service router, service router) divides the active and standby ports according to different access modes. In the prior art, a cold backup mode is adopted between the active and standby SRs, and when a network element or link in the active segment fails, the active-standby switchover is completed manually. That is, when the master/standby SR switchover needs to be performed, manual intervention is required, which is inefficient.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a method, device and SR for switching between an active service router SR and a standby SR, which can automatically realize the switching between the active and standby SRs according to the link communication state, without manual intervention, and improve the The switching efficiency of the active and standby SRs is improved.

In order to achieve the above object, the present invention provides a method for switching between an active service router SR and a standby SR, which is used in a metropolitan area network using a shared gateway, including: according to the configuration mode of the optical line terminal OLT, detecting through a corresponding protocol Whether the status of the link between the active SR and the OLT is available, wherein when the OLT adopts a dual uplink configuration, the protocol is the Ethernet connectivity fault management ETH-CFM protocol. When the single uplink configuration is adopted, the protocol is the link aggregation control protocol LACP; when the state of the link between the active SR and the OLT is in the unavailable state, the active SR is switched from the active state to the standby state ; Notify the standby SR to switch from the standby state to the active state.

Preferably, the switching of the active SR from the active state to the standby state is specifically: setting the state of the service access point sap of the active SR to the off state.

Preferably, the notifying the standby SR to switch from the standby state to the active state is specifically: communicating with the standby SR through the user routing redundancy protocol SRRP, and informing the standby SR to switch from the standby state to the active state.

The present invention also provides a switching method between the active service router SR and the standby SR, which is used in a metropolitan area network using an independent gateway, including: acquiring the communication status of the active SR and the standby SR; When the communication status of the standby SR indicates that the standby SR cannot receive the message sent by the active SR, check whether the link between the standby SR and the switch SW is available; when the link between the standby SR and the switch SW is available, the standby SR is Switch from the standby state to the active state.

Preferably, the acquiring the communication status of the active SR and the standby SR is specifically: acquiring the communication status of the active SR and the standby SR through the ETH-CFM protocol.

The present invention also provides a switching device for the active service router SR and the standby SR, which is used in a metropolitan area network using a shared gateway, comprising: a first detection module, which is used for, according to the configuration mode of the optical line terminal OLT, through corresponding The protocol detects whether the status of the link between the active SR and the OLT is available, wherein, when the OLT adopts the dual uplink configuration, the protocol is the Ethernet connectivity fault management ETH-CFM protocol, when When the OLT adopts a single uplink configuration, the protocol is the Link Aggregation Control Protocol LACP; the switching module is configured to switch the active SR when the state of the link between the active SR and the OLT is unavailable. Switch from the active state to the standby state; the notification module is used to notify the standby SR to switch from the standby state to the active state.

Preferably, the switching module is further configured to set the state of the service access point sap of the active SR to a closed state.

Preferably, the notification module communicates with the standby SR through the user routing redundancy protocol SRRP, and notifies the standby SR to switch from the standby state to the active state.

The present invention also provides a switching device for the main service router SR and the standby SR, which is used in a metropolitan area network using an independent gateway, comprising: an acquisition module for acquiring the communication status of the main SR and the standby SR; a second The detection module is used to detect whether the link between the backup SR and the switch SW is available when the communication state between the primary SR and the backup SR indicates that the backup SR cannot receive the message sent by the primary SR; the switching module is used for When the link between the standby SR and the switch SW is available, the standby SR is switched from the standby state to the active state.

Preferably, the acquisition module acquires the communication status of the active SR and the standby SR through the ETH-CFM protocol.

The present invention also provides an SR, including the above-mentioned switching device of the active service router SR and the standby SR.

The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:

The present invention provides a method, device and SR for switching between an active service router SR and a standby SR, which can automatically realize the switching between the active and standby SRs according to the link communication state, without manual intervention, and improve the switching of the active and standby SRs. efficiency.

Description of drawings

FIG. 1 is a flowchart of a method for switching between an active service router SR and a standby SR according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart of a method for switching between an active service router SR and a standby SR according to Embodiment 2 of the present invention.

FIG. 3 is a schematic structural diagram of a device for switching between an active service router SR and a standby SR according to Embodiment 1 of the present invention.

FIG. 4 is a schematic structural diagram of a device for switching between an active service router SR and a standby SR according to Embodiment 2 of the present invention.

FIG. 5 is a schematic diagram of a metropolitan area network structure using a large V-shaped structure.

FIG. 6 is a schematic diagram of a metropolitan area network structure using a small V-shaped structure.

FIG. 7 is a schematic diagram of a metropolitan area network structure using an independent gateway structure.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

Aiming at the problem of manual intervention and low efficiency in the prior art when the main and standby SRs need to be switched, the present invention provides a switching method, device and SR for the main service router SR and the standby SR, which can communicate according to the link. The switch between the active and standby SRs is automatically realized without manual intervention, which improves the switching efficiency of the active and standby SRs.

1 is a flowchart of a method for switching between an active service router SR and a standby SR according to Embodiment 1 of the present invention, which is used in a metropolitan area network with a shared gateway structure. As shown in the figure, the method includes:

Step S100, according to the configuration mode of the OLT of the optical line terminal, detect whether the status of the link between the active SR and the OLT is an available state through a corresponding protocol, wherein, when the OLT adopts a dual uplink configuration, the The protocol is the Ethernet connectivity fault management ETH-CFM protocol, and when the OLT adopts a single uplink configuration, the protocol is the Link Aggregation Control Protocol LACP;

Step S102, when the state of the link between the active SR and the OLT is unavailable, switch the active SR from the active state to the standby state;

Step S104, notify the standby SR to switch from the standby state to the active state.

In the above technical solution, it is detected whether the link state between the active SR and the OLT is available, and when it is unavailable, the active SR is switched from the active state to the standby state, and the standby SR is notified to switch from the standby state to the active state , so that the automatic switching of the active and standby SRs is realized without manual intervention, and the switching efficiency of the active and standby SRs is improved.

Wherein, when the OLT adopts a dual uplink configuration, it is detected whether the state of the link between the active SR and the optical line terminal OLT is an available state through the ETH-CFM protocol.

In the above technical solution, the OLT adopts a dual-uplink configuration, that is, the OLT is dual-connected to two switches to detect the link status from the active SR to the OLT, that is, to detect the link status between the active SR and the OLT across switches. It can support the end-to-end link detection protocol across network elements. Therefore, the ETH-CFM (Ethernet Connectivity Fault Management, Ethernet Connectivity Fault Management) protocol can be used to detect the link status between the active SR and the OLT.

Wherein, when the OLT adopts a single uplink configuration, the link aggregation control protocol LACP is used to detect whether the status of the link between the active SR and the optical line terminal OLT is available.

In the above technical solution, the OLT adopts a single uplink configuration, that is, the OLT is connected to one switch, the OLT is connected to the switch using the LACP protocol, and the link status from the active SR to the OLT can be detected, and the link status from the SR to the switch can be detected separately. and the link status from the switch to the OLT. The LACP protocol is used between the SR and the switch. Therefore, the LACP protocol can be used to detect the link status between the active SR and the OLT.

The switching of the active SR from the active state to the standby state is specifically: setting the state of the service access point sap of the active SR to the off state.

In the above technical solution, when the state of the link between the active SR and the OLT is in an unavailable state, the state of the service access point sap of the active SR is set to a closed state. At this time, the active SR The state of the active SR is switched from the active state to the standby state, such as switching from master to initialize, so that the active SR will not transmit user services.

The notifying the standby SR to switch from the standby state to the active state may specifically include: communicating with the standby SR through the user routing redundancy protocol SRRP, and informing the standby SR to switch from the standby state to the active state.

In the above technical solution, the active SR and the standby SR can communicate through the user routing redundancy protocol, thereby informing the standby SR to switch its state from the standby state to the active state, such as switching from backupshunt to master.

2 is a flowchart of a method for switching an active service router SR and a standby SR according to Embodiment 2 of the present invention, which is used for a standby SR in a metropolitan area network with an independent gateway structure, and the method includes:

Step S200, obtaining the communication status of the active SR and the standby SR;

Step S202, when the communication state of the primary SR and the backup SR indicates that the backup SR cannot receive the message sent by the primary SR, detect whether the link between the backup SR and the switch SW is available;

Step S204, when the link between the standby SR and the switch SW is available, the standby SR is switched from the standby state to the active state.

In the above technical solution, in the independent gateway structure, the active SR and the standby SR can communicate through the switch SW, that is, the link link in the independent gateway structure is: the active SR—the switch SW—the standby SR. When the standby SR can When the message from the active SR is received, it indicates that the link between the active SR, the switch SW and the standby SR is normal, and the active SR can transmit data. Therefore, there is no need to switch the active and standby SRs. When the standby SR cannot receive When a message arrives from the active SR, it indicates that there is a problem with the link between the active SR, the switch SW, and the backup SR. There may be a problem with the link between the active SR and the switch SW, or the backup SR and the backup SR may have problems. If there is a problem between the switches SW, when there is a problem with the active SR and the switch SW, it is necessary to switch the active and standby SRs, that is, the standby state of the standby SR is switched to the active state. Active-standby switchover, therefore, by detecting whether the link between the standby SR and the switch SW is available, when the link between the standby SR and the switch SW is available, the active-standby SR switchover is performed.

Wherein, the acquiring the communication state of the active SR and the standby SR may specifically be: acquiring the communication state of the active SR and the standby SR through the ETH-CFM protocol.

In the independent gateway structure, since there is no idle IP for SRRP virtual and real gateway IP address configuration, the SRRP protocol cannot be supported. Therefore, the OAM feature of the ETH-CFM protocol can be used to run ETH-CFM between the primary and backup SRs. protocol.

3 is a schematic structural diagram of a switching device for an active service router SR and a standby SR according to Embodiment 1 of the present invention, which is used in a metropolitan area network using a shared gateway structure, and the active service router SR and the standby SR switch The switching device 30 includes:

The first detection module 31 is configured to detect whether the state of the link between the active SR and the OLT is available according to the configuration mode of the optical line terminal OLT through the corresponding protocol, wherein, when the OLT adopts the dual uplink When configuring, the protocol is the Ethernet connectivity fault management ETH-CFM protocol, and when the OLT adopts a single uplink configuration, the protocol is the link aggregation control protocol LACP;

a switching module 32, configured to switch the active SR from the active state to the standby state when the state of the link between the active SR and the OLT is an unavailable state;

The notification module 33 is configured to notify the standby SR to switch from the standby state to the active state.

In the above technical solution, the first detection module 31 detects whether the link state between the active SR and the OLT is available, and when it is unavailable, the switching module 32 switches the active SR from the active state to the standby state, and the notification module 33 notifies the The standby SR is switched from the standby state to the active state, thereby realizing the automatic switching of the active and standby SRs without manual intervention, and improving the switching efficiency of the active and standby SRs.

Preferably, the switching module is further configured to set the state of the service access point sap of the active SR to a closed state.

Preferably, the notification module communicates with the standby SR through the user routing redundancy protocol SRRP, and notifies the standby SR to switch from the standby state to the active state.

4 is a schematic structural diagram of a device for switching between a primary service router SR and a backup SR according to Embodiment 2 of the present invention, which is used for a backup SR in a metropolitan area network with an independent gateway structure, the primary service router SR and the backup SR The switching device 40 of the standby SR includes:

an acquisition module 41, used to acquire the communication status of the main SR and the standby SR;

The second detection module 42 is configured to detect whether the link between the standby SR and the switch SW is available when the communication state of the primary SR and the standby SR indicates that the standby SR cannot receive the message sent by the primary SR;

The switching module 43 is configured to switch the standby SR from the standby state to the active state when the link between the standby SR and the switch SW is available.

In the above technical solution, in the independent gateway structure, the active SR and the standby SR can communicate. When the standby SR can receive messages from the active SR, it indicates that the active SR can transmit data to the outside. Switchover of the standby SR. When the standby SR cannot receive messages from the active SR, it indicates that there is a problem with the link between the active SR, the switch SW, and the standby SR, and there may be a link between the active SR and the switch SW. If there is a problem with the road, there may also be a problem between the standby SR and the switch SW. When there is a problem between the active SR and the switch SW, it is necessary to switch the active and standby SRs, that is, the standby state of the standby SR is switched to the active state, and the acquisition module 41 Obtain the communication status between the active SR and the standby SR. When the communication status between the active SR and the standby SR indicates that the standby SR cannot receive the messages sent by the active SR, and if there is a problem with the switch SW, the active/standby switchover is not required. , therefore, the second detection module 42 detects whether the link between the standby SR and the switch SW is available, and when the link between the standby SR and the switch SW is available, the switching module 43 switches the standby SR from the standby state to the active state state.

Preferably, the acquisition module acquires the communication status of the active SR and the standby SR through the ETH-CFM protocol.

An SR includes the above-mentioned switching device of an active service router SR and a standby SR.

FIG. 5 is a schematic diagram of a metropolitan area network structure using a large V-shaped structure.

The characteristics of the MAN structure of the large V-type access mode are: OLT dual access to 2 SWs (switches, switches), as shown in the figure, when the main service router is SR1, the downlink traffic of user service routing is transmitted by SR1, and passes through SR1. The switch SW1 is sent to the OLT, and sent to each user via the optical network unit ONU. When the link from SR1 to OLT is interrupted, the link cannot transmit data. If SR1 is still used as the main service router, there will be problems. Therefore, it is necessary to switch the main and backup service routers. Therefore, the main service router Whether to switch between the active and standby service routers can be determined according to the state of the entire spanning SW link from the active service router to the OLT.

In order to detect the link status between the active service router and the OLT, the ETH-CFM protocol can be run between the service router and the OLT, and the link status between the active service router and the OLT can be detected according to the protocol. The specific implementation is as follows: as shown in the figure, the ETH-CFM protocol is respectively enabled on the two ports connected to the OLT and the downlink ports of the two service routers corresponding to the two ports, and the OLT and the main service router are transparently transmitted through SW1 ETH-OAM (ethernet operation, administration and management) message. When the link between the active service router SR1 and SW1 or the link between SW1 and the OLT is interrupted, the active service router SR1 cannot receive the ETH-OAM message sent by the OLT, so the active service router can be determined. The link between SR1 and the OLT is interrupted, the state of the associated user interface sap point of the active service router SR1 changes from up to down, and the state of the active service router SR1 is switched from master to initialize.

Through the SRRP running between the active service router and the standby service router, the virtual redundant interface of the active and standby service routers can transmit state synchronization information, and the active service router can notify the standby service router SR2 The state is switched from backupshunt to master, that is: The original standby service router SR2 is switched to the active service router. At this time, the current active service router, the original standby service router SR2, advertises the switched user service route, and the downlink traffic of the user service route in this segment is switched from SR1 to SR2.

FIG. 6 is a schematic diagram of a metropolitan area network structure using a small V-shaped structure.

The characteristics of the MAN structure of the small V-type access mode are: OLT accesses one SW (switch, switch), as shown in the figure, when the main service router is SR1, the downlink traffic of user service routing is transmitted by SR1, and passes through the switch. SW, sent to the OLT, and sent to each user via the optical network unit ONU. When the link from SR1 to SW is interrupted or the link from SW to OLT is interrupted, SR1 to OLT cannot transmit data. If SR1 is still used as the main service router, problems will occur, so it is necessary to configure the primary and backup service routers. Therefore, the active service router can determine whether to switch the active and standby service routers according to the state of the entire spanning SW link from the active service router to the OLT. The status of each link needs to be detected.

In order to detect the link status between the active service router and the OLT, the LACP protocol can be run between the service router and the SW. Road bundling implements link-level protection. Of course, the LACP protocol can also be used to detect the link status between the SW and the OLT. The specific implementation is as follows: as shown in the figure, the LACP protocol is enabled between the SW and the service router. When the link between the active service router SR1 and the SW is interrupted, the active service router SR1 will not be able to receive the LACPDU (LinkAggregation Control Protocol Data Unit, Link Aggregation Control Protocol Data Unit) sent by the SW, so that the active service router SR1 can be determined. The link between the service router SR1 and the OLT is interrupted, the state of the associated user interface sap point of the active service router SR1 changes from up to down, and the state of the active service router SR1 is switched from master to initialize.

Through the SRRP running between the active service router and the standby service router, the virtual redundant interface of the active and standby service routers can transmit state synchronization information, and the active service router can notify the standby service router SR2 The state is switched from backupshunt to master, that is: The original standby service router SR2 is switched to the active service router. At this time, the current active service router, the original standby service router SR2, advertises the switched user service route, and the downlink traffic of the user service route in this segment is switched from SR1 to SR2.

FIG. 7 is a schematic diagram of a metropolitan area network structure using an independent gateway structure.

The characteristics of the MAN structure of the independent gateway access method are: each user is allocated an independent address space and has an independent gateway. In a metropolitan area network with independent gateway access, the service access point sap of the active service router is up, and the service access point sap of the standby service router is down.

In the metropolitan area network with independent gateway access mode, there are no free two IP address resources for the real gateway IP of SRRP, and the SRRP protocol is not supported, that is, the SRRP protocol cannot be run between the active service server and the standby service server. Therefore, , as shown in the figure, in order to control the status of the service access point sap of the active service router SR1 and the standby service router SR2, the ETH-CFM protocol can be run between the active service router SR1 and the standby service router SR2, and the SW The transparent transmission method is implemented. The main service router SR1 only sends and does not receive OAM packets of the ETH-CFM protocol, and the standby service router SR2 only receives and does not send OAM packets of the ETH-CFM protocol. When the road is interrupted, the sap status of the active service router SR1 will become down. At this time, the standby service router SR2 cannot receive the OAM packet of the ETH-CFM protocol sent by the active service router SR1, so that the active service router can be determined. The link on the SR1 side is interrupted, and the status of the associated user interface sap point of the standby service router SR2 changes from down to up. At this time, the current active service router, that is, the original standby service router SR2, advertises the switched user service routes. The downlink traffic of the user service route of this segment is switched from SR1 to SR2.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (5)

1. a switching method of main service router SR and standby SR, for adopting in the metropolitan area network of shared gateway, it is characterized in that, comprising: According to the configuration mode of the OLT of the optical line terminal, whether the status of the link between the active SR and the OLT is available is detected through the corresponding protocol, wherein, when the OLT adopts the dual uplink configuration, the protocol is Ethernet Network connectivity fault management ETH-CFM protocol, when the OLT adopts a single uplink configuration, the protocol is the link aggregation control protocol LACP; When the state of the link between the active SR and the OLT is an unavailable state, switching the active SR from the active state to the standby state; Through the user routing redundancy protocol SRRP, it communicates with the standby SR to notify the standby SR to switch from the standby state to the active state. 2. The method according to claim 1, wherein the switching of the active SR from the active state to the standby state is specifically: Set the status of the service access point sap of the active SR to the off state. 3. A switching device of a main service router SR and a backup SR, used in a metropolitan area network using a shared gateway, characterized in that it comprises: The first detection module is configured to detect whether the state of the link between the active SR and the OLT is available according to the configuration mode of the optical line terminal OLT through the corresponding protocol, wherein, when the OLT adopts the dual uplink configuration When the protocol is the Ethernet connectivity fault management ETH-CFM protocol, when the OLT adopts a single uplink configuration, the protocol is the link aggregation control protocol LACP; a switching module, configured to switch the active SR from the active state to the standby state when the state of the link between the active SR and the OLT is unavailable; The notification module is used to communicate with the standby SR through the user routing redundancy protocol SRRP, and notify the standby SR to switch from the standby state to the active state. 4 . The apparatus according to claim 3 , wherein the switching module is further configured to set the state of the service access point sap of the active SR to a closed state. 5 . 5. An SR, characterized in that it comprises the switching device of the active service router SR and the standby SR according to any one of claims 3-4.

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