Improved quick rerouting method and network equipment

Abstract

The invention discloses an improved quick rerouting method and a network device. The network device is provided with a main interface and a backup interface for a service flow. The method includes that the network device receives the service flow; the network device detects whether the inlet interface for receiving the service flow is the same with the outlet interface of the service flow in the self forwarding information table, and the inlet interface is the main interface, if so, the service flow is switched onto the backup interface for forwarding, so that the service flow transmits through the backup chain circuit. The technical scheme of the invention can avoid long time interruption of service flow caused by the generation of routing loop.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to an improved fast rerouting method and a network device. Background technique [0002] The interruption of traffic transmission caused by link or node failure on the network will not be restored until the route reconverges on the new topology. During this period, the packets that must traverse the failed part to reach the destination will be lost or cause a loop . [0003] Although many new technologies have been adopted in the fast convergence of routing protocols, the speed of routing convergence has been greatly improved. However, the emergence of new network services such as voice and video imposes stricter requirements on the traffic interruption time. Many operators expect the traffic interruption time caused by network failures to be controlled within 50 ms or even lower, which cannot be achieved through traditional routing protocol fast convergence technolog...

AI Technical Summary

Problems solved by technology

[0008] exist figure 2 In the initial stage, the service flow from device C to device A is forwarded through link C-B-A. If the link between device B and device A fails at this time, after device B detects the failure, in order to switch the service flow to On the backup link C-D-E-A, the service flow is forwarded through the interface B2, so that the service flow from C to A is first forwarded to B through the C-B link, and then B returns the service flow to C; however, since C cannot quickly perceive the occurrence of B The change of the link switching will still forward the service flow through the main interface C1, thus forming a routing loop; this loop will return to normal only after the routing protocol converges and generates a new topology, resulting in a long-term interruption of the service flow

[0009] To sum up, the existing IP FRR technology will still cause long-term interruption of service flow due to routing loops

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