Main and standby switching method of device supporting multi-topology routing as well as master control board

Abstract

The invention discloses a main and standby switching method of a device supporting multi-topology routing as well as a master control board. The main and standby switching method of the device comprises the following steps that when a standby board of the device supporting MTR (Multi-Topology Routing) finds that a main board goes wrong, the standby board enters a main and standby switching process, a backup intermediate system is used for interconnecting IS-IS (Intermediate System-to-Intermediate System) data so as to carry out routing computation and introduction on each sub-topology; when the standby board finds that the routing computation and the introduction of one sub-topology are completed, the standby board generates a LSP (Layered Service Provider) message, and for the sub-topology subjected to the routing computation and the introduction, a routing computation and introduction completing mark of each sub-topology is arranged in the LSP message; and the standby board sends the LSP message to a neighborhood device so that the neighborhood device carries out local routing computation on each sub-topology subjected to the routing computation and the introduction on the standby board according to the routing computation and introduction completing mark in the LSP message. By adopting the main and standby switching method, the routing convergence time is reduced when the main and standby switching occurs in the device supporting multi-topology routing.

Description

technical field [0001] The present invention relates to the technical field of routing convergence, in particular to a method for active / standby switchover of equipment supporting Multiple Topology Routing (MTR) and a main control board located on the equipment supporting MTR. Background technique [0002] For traditional routing technologies, a physical topology relies on routing to establish a logical structure, and different service packets for the same purpose must be forwarded through the same link. Of course, the next hop can be changed through policy-based routing (PBR, Policy-Based Routing), or traffic planning can be performed through traffic engineering (TE, Traffic Engineer). However, Multiple Topology Route (MTR, MultipleTopology Route) provides another option. Compared with PBR, the advantage of MTR is that it is based on the topology rather than the next hop. Compared with TE, the deployment of MTR is more convenient. The implementation of MTR is to perform a...

AI Technical Summary

Problems solved by technology

[0012] The reason why LSP packets cannot be generated until the route calculation and import of all sub-topologies is completed is that when the device is configured with import, generating LSP packets too early may cause route flapping, because: EBGP GR is usually faster than IS- IS GR is slow. If LSP packets are generated and sent when IS-IS GR is completed, BGP routes will not be included in the LSP packets because BGP routes have not been imported into IS-IS routes at this time. After the device receives the LSP message and finds that the message does not carry a BGP route, it will consider its own BGP route invalid and delete its own BGP route, causing route flapping

[0013] It can be seen that when the device supports MTR, the standby board must wait until the route calculation and import of all sub-topologies are completed before it can generate LSP packets, which will slow down the route convergence speed of the device, especially when there are too many sub-topologies, it will be greatly reduced. Increase the time spent on route convergence

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