An isis LSP publishing method and device

Abstract

The invention discloses an ISIS (Intermediate System to Intermediate System) LSP (Layered Service Provider) publishing method and equipment. The method comprises the following steps that a self generated LSP is sent by Hub equipment through an interface connected with Spoke equipment or other Hub equipment, wherein the self generated LSP of the Hub equipment contains default routing information, so that a default route, the next hop of which is the Hub equipment, is generated by the Spoke equipment, which is used for receiving the self generated LSP of the Hub equipment, in accordance with the default routing information; and when the LSP is received by the Hub equipment, the LSP is preserved by the Hub equipment, and the forwarding of the LSP through an interface connected with the Spoke equipment is terminated. According to the ISIS LSP publishing method and the equipment, the LSP flooding overhead of the Hub equipment is reduced, and the LSDB (Link State Database) capacity and the routing computation overhead of the Spoke equipment are reduced, thereby improving the stability and the expandability of a network.

Description

technical field [0001] The present invention relates to the communication field, in particular to an ISIS LSP release method and equipment. Background technique [0002] ISIS (Intermediatesystemtointermediatesystem, intermediate system to intermediate system) protocol is an internal routing protocol based on the link state of the autonomous system. The LSP (LinkStateProtocolDataUnit, link state information protocol data unit) that describes the link state is diffused among the devices in the neighbor relationship, and the same LSDB (LinkStateDatabase, link state database) is finally formed on each device in the network, based on the LSDB Perform route calculation and save the generated routing information in the routing table. The routing table selects the optimal route and sends it to the forwarding table to guide packet forwarding. The ISIS protocol has the characteristics of wide adaptability, fast convergence speed, no loop, and supports routing classification. It is on...

AI Technical Summary

Problems solved by technology

The synchronization of LSDB in the whole level will cause the LSDB scale of the Spoke device and the Hub device to be the same size, including the LSP of the Hub and all Spokes, resulting in huge memory consumption

[0019] 2) The routing calculation overhead on the Spoke device is large

If there is a change in the interface status, neighbor status, or advertised route of a Spoke device, which leads to a change in the LSP, it will cause a large number of routing calculations for all other Spoke devices, resulting in huge CPU resource consumption.

[0021] 3) The cost of LSP flooding on the Hub device is high

However, in this solution, a large number of ISIS process configurations need to be done on the Hub device, which consumes a lot of system resources, and the configuration is relatively complicated, making it difficult for network administrators to maintain

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