WO2016034127A1

WO2016034127A1 - System and method for achieving dual-node interconnection pseudo-wire

Info

Publication number: WO2016034127A1
Application number: PCT/CN2015/088845
Authority: WO
Inventors: 张磊; 黄祥国; 刘涛
Original assignee: 烽火通信科技股份有限公司
Priority date: 2014-09-05
Filing date: 2015-09-02
Publication date: 2016-03-10
Also published as: CN104270231A; CN104270231B

Abstract

A system and method for achieving a dual-node interconnection pseudo-wire, relating to the technical field of wireless backhaul network applications; the system comprises two bridge nodes, at least one access side node, and at least one core side node; the two bridge nodes are respectively connected to each access side node and each core side node; the two bridge nodes are divided into a master node and a standby node, the master node and the standby node both being provided with an access side interface, a dual-node interconnection pseudo-wire side interface and a core side interface, any two interfaces on one bridge node being interconnected; a dual-node interconnection pseudo-wire side virtual circuit is provided between the master node and the standby node; an access side virtual circuit is respectively provided between the access side node and the master node and between the access side node and the standby node; the dual-node interconnection pseudo-wire side virtual circuit and the access side virtual circuit are bound in a dual-node interconnection pseudo-wire group; and an automatic protection switching signalling channel is superimposed respectively on the dual-node interconnection pseudo-wire side virtual circuit and on the access side virtual circuit.

Description

System and method for realizing two-node interconnected pseudowire

Technical field

The present invention relates to the field of wireless backhaul network application technologies, and in particular to a system and method for implementing a two-node interconnected pseudowire.

Background technique

With the LTE (3GPP Long Term Evolution, 3GPP technology long-term evolution technology) gradually being widely used in China, higher requirements are placed on the wireless backhaul requirements of base station data services. At present, for its application in the wireless backhaul network, the common service model is to deploy the L2 network (Layer 2 network) for the access layer, the L3 network (Layer 3 network) for the core layer, and the L2 network to the L3 for the aggregation node through the bridge interface. Network business transformation.

The L2 network is a switching network, and the peer-to-peer pseudowire technology is used to implement the peer-to-peer communication pipeline. In order to implement line protection for services, PW (Pseudo Wire) redundancy protection is also deployed. LSP (Label Switched) Path, label switching path) 1:1 protection and other functions to protect the L2 network service overlay.

The L3 network is an IP forwarding network that forwards traffic through routing. In the L3 network, the protection function of the L3 network service is implemented through technologies such as VPN FRR (Virtual Private Network Fast Reroute).

In the existing network protection model, the linear protection of LSP1:1 is superimposed on the basis of PW redundancy protection to prevent link communication interruption in the L2 network. However, this method has the following drawbacks: When the PW redundancy protection is triggered, the downlink link does not detect the link fault of the access layer. If the slave node is still offline, the service will be interrupted; and PW redundancy protection is adopted. The design superimposed with LSP1:1 protection makes the process of the existing network configuration more Complex, seriously wasting label resources.

Summary of the invention

In view of the deficiencies in the prior art, the present invention aims to provide a system and method for implementing a two-node interconnected pseudowire. The present invention eliminates the need for overlaying LSP1:1 protection, simplifies the protection model in the L2 network, and improves The stability and reliability of the protection function.

To achieve the above objective, the technical solution adopted by the present invention is: a system for implementing a two-node interconnected pseudowire, comprising two bridge nodes, at least one access side node, and at least one core side node, wherein the two bridge nodes respectively Connected to each of the access side nodes and each of the core side nodes, the two bridge nodes are divided into a primary node and a standby node, and the primary node and the standby node are respectively provided with an access side interface and a dual node interconnection. A pseudowire side interface and a core side interface, and any two interfaces on the same bridge node communicate with each other; a dual node interconnected pseudowire side virtual circuit is provided between the active node and the standby node, and the access side node and the master An access-side virtual circuit is respectively disposed between the node and the standby node, and the dual-node interconnected pseudo-wire virtual circuit and the access-side virtual circuit are bound in a two-node interconnected pseudowire group, and the two-node interconnected pseudowire An automatic protection switching signaling channel is superimposed on the side virtual circuit and the virtual circuit on the access side.

On the basis of the above technical solution, the bridge node is provided with a plurality of interface boards, and the interface board is provided with a virtual bridge. The virtual bridge includes three interfaces, namely, an L2VE1 interface, an L3VE1 interface, and an L2VE0. interface.

On the basis of the foregoing technical solution, the L2VE1 interface corresponds to the access side interface, the L3VE1 interface corresponds to the core side interface, and the L2VE0 interface corresponds to the dual node interconnected pseudowire side interface; wherein the L2VE1 interface and the L3VE1 interface are a default. The bridging group is used to complete the bridging of the L2 network service interface and the L3 network service interface. The L2VE0 interface is an interface of the two-node interconnected pseudowire side, which is used to bridge the L2 network service interface and the L3 network service interface.

Based on the foregoing technical solution, at least one of the L2VE1 interfaces is bound On the logical sub-interface, the L3VE1 interface terminates all logical sub-interfaces on the L2VE1 interface and forms a termination sub-interface. In the bridge group consisting of the L2VE1 interface and the L3VE1 interface, the services of all interfaces on the L2VE1 interface are forwarded to the mapping by default. Under the L3VE1 interface.

On the basis of the above technical solution, the default path of the virtual bridge on the active node is: in the uplink direction, sent by the L2VE1 interface to the L3VE1 interface, or sent by the L2VE0 interface to the L3VE1 interface; in the downlink direction, it is determined by the L2VE1 according to the service type. The interface or the L2VE0 interface forwards.

On the basis of the foregoing technical solution, the default path of the virtual bridge on the standby node is: in the uplink direction, sent by the L2VE1 interface to the L2VE0 interface or sent by the L2VE0 interface to the L3VE1 interface; when switching, the L2VE1 interface is sent to the L3VE1 interface; Direction, forwarded by the L2VE1 interface.

The present invention also provides a method for implementing a two-node interconnected pseudowire, which includes the following steps: setting a default working path of the active node from the access side interface to the core side interface, and the default working path of the standby node is the access side interface. To the core side interface; the access side node and the standby node complete the access side protocol information exchange through the pseudowire automatic protection switching; the primary node and the standby node automatically protect the switching information through the pseudowire, and complete the interaction between the active and standby nodes. The interaction of the state information; the state machine of the active node completes the bridge switching of the bridge node according to the automatic protection switching message sent by the standby node and the link state of the active node and the access side.

On the basis of the foregoing technical solution, a transport layer OAM is initiated between the access side node and the active node to detect a communication state of the virtual circuit link between the access side node and the active node; in the primary node and the standby node The communication state of the virtual circuit link between the active node and the standby node is detected through the transport layer OAM.

On the basis of the foregoing technical solution, the ARP hot standby function is configured on the bridge node, that is, the ARP address learned by the active node is synchronized to the ARP entry of the standby node; When the active node fails, the downlink service reaches the standby node, and then the ARP entry information synchronized on the standby node is used to forward the service.

The beneficial effects of the invention are:

1. The invention only deploys PW redundancy protection at the access layer, and does not need to perform overlay of LSP1:1 protection, which simplifies the protection model in the L2 network and improves the stability and reliability of the protection function.

2. The present invention can effectively connect the L2 network and the L3 network by setting up a virtual bridge and configuring the primary and backup nodes for the virtual bridge, thereby improving the survivability of the service in the entire network.

3. The method adopted by the present invention, through the L2VE1 interface and the bridge group associated with the L3VE1 interface, the function is simple and effective, and the specific implementation method is isolated for the user. In the process of smooth system upgrade, the user can be perceived less. Significantly improve its performance.

DRAWINGS

1 is a topological structural diagram of a system for implementing a two-node interconnected pseudowire in an embodiment of the present invention;

2 is a simplified model diagram of a bridge node in an embodiment of the present invention;

3 is a virtual model diagram of three interfaces on a bridge node in an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS:

1-access side interface; 2-core side interface; 3-double node interconnected pseudowire side interface.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 , a system for implementing a DNI-PW (Dual Node Interconnection Pseudo Wire) includes two bridge nodes, at least one access side node, and at least one core side node, where Ingress side node and core side node The number varies arbitrarily with the size of the network. The two bridge nodes are respectively connected to each access side node and each core side node, and the two bridge nodes are divided into a primary node and a standby node, and the primary node and the standby node are connected. Inbound interface 1, dual node interconnected pseudowire side interface 3 and core side interface 2, and any two interfaces on the same bridge node communicate with each other; a dual node interconnected pseudowire side is provided between the active node and the standby node VC (Virtual Circuit), an access side virtual circuit is provided between the access side node and the active node and the standby node, and the virtual circuit of the two-node interconnected pseudowire side is bound to the virtual circuit of the access side. In the two-node interconnected pseudowire group, the APS (Auto Protect Switch) signaling channel is superimposed on the virtual circuit of the two-node interconnected pseudowire and the virtual circuit on the access side, respectively, to implement bridge protection for services.

Referring to FIG. 2, the bridge node is provided with a plurality of interface boards, and the interface board is provided with a virtual bridge, and the virtual bridge is used to convert the L2 network to the L3 network, and the service is also performed on the virtual bridge. Forwarding action behavior, each virtual bridge is unique on the bridge node, globally valid and does not depend on a specific board.

As shown in FIG. 3, the virtual bridge includes three interfaces, namely, an L2VE1 interface, an L3VE1 interface, and an L2VE0 interface. The L2VE1 interface corresponds to the access side interface 1, the L3VE1 interface corresponds to the core side interface 2, and the L2VE0 interface corresponds to the dual node interconnected pseudowire side interface 3. The L2VE1 interface and the L3VE1 interface are a default bridging group. It is used to complete the bridging of the L2 network service interface and the L3 network service interface. The L2VE0 interface is an interface on the side of the two-node interconnected pseudowire to complete the bridging of the L2 network service interface and the L2 network service interface. The L2VE1 interface and the access-side node are used to quickly detect the link communication status through OAM (Operation Administration and Maintenance). When the access-side alarm is detected, the interface on the associated active node is activated, and the L3VE1 interface is pointed to L2VE0. interface.

The L2VE1 interface is bound to at least one logical sub-interface, and the L3VE1 interface is terminated. All the logical sub-interfaces on the L2VE1 interface are configured as a termination sub-interface. In the bridging group of the L2VE1 interface and the L3VE1 interface, the services of all the interfaces on the L2VE1 interface are forwarded to the L3VE1 interface. When the PW bound to a logical sub-interface on the L2VE1 interface fails, the downlink switching of the L3VE1 interface only performs the switching action for the invalid logical sub-interface under the L2VE1 interface.

The default path of the virtual bridge on the active node is: in the uplink direction, it is sent to the L3VE1 interface by the L2VE1 interface or sent to the L3VE1 interface by the L2VE0 interface. In the downlink direction, it is forwarded by the L2VE1 interface or the L2VE0 interface according to the service type. The default path of the virtual bridge on the standby node is: in the uplink direction, sent by the L2VE1 interface to the L2VE0 interface or sent by the L2VE0 interface to the L3VE1 interface; when switching, it is sent to the L3VE1 interface by the L2VE1 interface; in the downlink direction, it is forwarded by the L2VE1 interface.

A method for implementing a two-node interconnected pseudowire based on the above system includes the following steps:

The default working path of the active node is the access side interface 1 to the core side interface 2. The default working path of the standby node is the access side interface 1 to the core side interface 2.

The access side protocol information exchange is performed between the access node and the standby node through the PW APS (Pseudo Wire Auto Protect Switch). The active node and the standby node automatically protect the switching information through the pseudowire. Complete the interaction of status information between the active and standby nodes.

Initiating TP OAM (Transport Operation Administration Maintenance) between the access side node and the active node to detect the communication state of the virtual circuit link between the access side node and the active node; The communication state of the virtual circuit link between the active node and the standby node is detected between the standby nodes through the transport layer OAM. According to the access side protocol information and the state information between the active and standby nodes, the state machine of the active node completes the bridging of the bridge node according to the automatic protection switching message sent by the standby node and the link state of the active node and the access side. Switched.

The ARP (Address Resolution Protocol) hot standby function is configured on the bridge node, that is, the ARP address learned by the active node is synchronized to the ARP entry of the standby node; when the active node fails, the downlink is performed. After the service reaches the standby node, the service is forwarded by searching for the ARP entry information synchronized on the standby node. Specifically, the service that is downlinked from the L3VE1 interface is forwarded through the corresponding logical sub-interface through the ARP entry information. When the ARP entry learning information is not received, the ARP address learning process is triggered on the L3VE1 interface. The ARP request packet is sent to the downstream node. When the ARP response packet is received, the ARP entry information is learned.

When two bridge nodes are respectively connected to multiple access side nodes and multiple core side nodes, the two bridge nodes are respectively connected to each access side node and each core side node, and each access side is An access side virtual circuit is respectively disposed between the node and the active node and the standby node.

The present invention is not limited to the above embodiments, and those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings are also considered as protection of the present invention. Within the scope. The contents not described in detail in the present specification belong to the prior art well known to those skilled in the art.

Claims

A system for implementing a two-node interconnected pseudowire includes two bridge nodes, at least one access side node, and at least one core side node, and the two bridge nodes are respectively associated with each access side node and each core side node The connection is characterized in that: the two bridge nodes are divided into a primary node and a standby node, and the primary node and the standby node are respectively provided with an access side interface, a dual node interconnected pseudowire side interface, and a core side interface. And any two interfaces on the same bridge node communicate with each other;

A dual-node interconnected pseudowire side virtual circuit is disposed between the active node and the standby node, and an access side virtual circuit is respectively disposed between the access side node and the active node and the standby node, and the dual node interconnected pseudowire The side virtual circuit and the access side virtual circuit are bound in a two-node interconnected pseudowire group, and the automatic protection switching signaling channel is superimposed on the virtual circuit of the two-node interconnected pseudowire side and the virtual circuit on the access side.
The system for implementing a two-node interconnected pseudowire according to claim 1, wherein the bridge node is provided with a plurality of interface cards, and the interface card is provided with a virtual bridge, and the virtual bridge includes 3 Interfaces are L2VE1 interface, L3VE1 interface, and L2VE0 interface.
The system for implementing a two-node interconnected pseudowire according to claim 2, wherein the L2VE1 interface corresponds to an access side interface, the L3VE1 interface corresponds to a core side interface, and the L2VE0 interface corresponds to a dual node interconnected pseudowire side interface. The L2VE1 interface and the L3VE1 interface are a default bridging group, which is used to complete the bridging of the L2 network service interface and the L3 network service interface, and the L2VE0 interface is an interface of the two-node interconnection pseudowire side, which is used to complete the L2 network service interface. Bridge of the L3 network service interface.
The system for implementing a two-node interconnected pseudowire according to claim 3, wherein at least one logical sub-interface is bound to the L2VE1 interface, and the L3VE1 interface terminates all logical sub-interfaces on the L2VE1 interface, and forms a termination. Subinterface configuration, On the L2VE1 interface and the L3VE1 interface, the services of all interfaces on the L2VE1 interface are forwarded to the mapped L3VE1 interface by default.
The system for implementing a two-node interconnected pseudowire according to claim 3, wherein the default path of the virtual bridge on the active node is: in the uplink direction, sent by the L2VE1 interface to the L3VE1 interface, or sent by the L2VE0 interface to the L3VE1 interface. Interface: In the downlink direction, it is determined to be forwarded by the L2VE1 interface or the L2VE0 interface according to the service type.
The system for implementing a two-node interconnected pseudowire according to claim 3, wherein the default path of the virtual bridge on the standby node is: in the uplink direction, sent by the L2VE1 interface to the L2VE0 interface or sent by the L2VE0 interface to the L3VE1 interface; When switching, it is sent to the L3VE1 interface by the L2VE1 interface; in the downstream direction, it is forwarded by the L2VE1 interface.
A method for implementing a two-node interconnected pseudowire according to the system of claim 1, comprising the steps of:

The default working path of the active node is set from the access side interface to the core side interface, and the default working path of the standby node is the access side interface to the core side interface.

The access side protocol and the standby node complete the access side protocol information exchange through the pseudowire automatic protection switching; the primary node and the standby node automatically protect the switching information through the pseudowire, and complete the interaction of the state information between the active and standby nodes;

The state machine of the active node completes the bridge switching of the bridge node according to the automatic protection switching message sent by the standby node and the link state of the active node and the access side.
The method for implementing a two-node interconnected pseudowire according to claim 7, wherein:

Initiating a transport layer OAM between the access side node and the active node to detect a communication state of the virtual circuit link between the access side node and the active node;

The communication state of the virtual circuit link between the active node and the standby node is detected by the transport layer OAM between the primary node and the standby node.
The method for implementing a two-node interconnected pseudowire according to claim 7, wherein the bridge node is provided with an ARP hot standby function, that is, the ARP address learned on the active node is synchronized to the ARP of the standby node. In the entry, when the primary node fails, the downlink service reaches the standby node, and then the ARP entry information synchronized on the standby node is used to forward the service.