A method and device for updating link state data packets

Abstract

The invention discloses a method and a device for realizing link-state packet updating; the method comprises the following steps: according to a classification strategy, dividing LSP (Link-State Packet) fragments of a system into two fragment types or more, and determining a TLV (Type-Length-Value) type corresponding to each of the fragment types when the LSP updating is carried out; during the LSP updating, determining the corresponding fragment types according to the TLV types of to-be-updated TLV information; and selecting the LSP fragments from the determined fragment types for updating the TLV information. The LSP updating comprises the steps of adding the TLV information, and / or deleting the TLV information, and / or modifying the TLV information. According to the method disclosed by the invention, by dividing the fragment types of the LSP fragments of the system, the LSP flooding load due to a fact that all LSP fragments are recombined and updated in the LSP updating is avoided, and the operating speed of the system is improved.

Description

technical field [0001] The invention relates to routing switching technology, in particular to a method and device for updating link state packets (LSP). Background technique [0002] The Link State Packet (LSP) contains the routing information generated by the Link State Routing Protocol (ISIS) router to describe its surrounding environment; the LSP consists of a header and a Type Length Content (TLV) field, which is used to publish routes between ISIS nodes Select information, the router advertises the LSP to all neighbors, thereby generating local link state information; the router receives the LSP advertised by other neighbors, copies and advertises, and thus obtains the topology information of the entire network. [0003] When the ISIS system is running, the adjacency relationship is up / down, the interface is enabled with ISIS, the imported Internet Protocol (IP) route changes, the IP route between areas changes, the metric (metric) value is modified, and the timing ref...

AI Technical Summary

Problems solved by technology

[0003] When the ISIS system is running, the adjacency relationship is up / down, the interface is enabled with ISIS, the imported Internet Protocol (IP) route changes, the IP route between areas changes, the metric (metric) value is modified, and the timing refresh, etc. will trigger LSP update. ;When the LSP is updated, all LSP fragments will be reorganized and updated, resulting in LSP flood load, consuming the central processing unit (CPU) of the local device and the remote device, causing the system to run slowly

When the number of LSP fragments is large, LSP periodic refresh will cause the network to send a large number of LSP updates in an instant, and the pressure on the network will increase instantly, and even the problem of long-term CPU occupation and hang-up may occur.

[0004] To sum up, the existing LSP update method has the problem of flooding load, which affects the running speed of the system; when there are many LSP fragments, the CPU will be occupied for a long time and hang up, which will affect the normal communication of the system

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