Method and network equipment for suppressing periodic refreshing and aging of link state messages

Abstract

The present application discloses a method for suppressing the periodical refreshing and aging of the link state message LSP, which is applied to a network including multiple network devices. flag, publish the LSP; when the content of the LSP changes, refresh the LSP and flood all interfaces; when receiving an LSP carrying the aging suppression flag, compare the old and new of the corresponding LSP, if the received If the LSP is new and the remaining lifetime of the LSP is not 0, the aging timer of the received LSP is not started. The application also discloses a network device. This application can reduce the instantaneous pressure of the network, reduce the CPU consumption of the local device and the peer device, and improve the stability of the operation of the IS‑IS protocol.

Description

technical field [0001] The present application relates to the technical field of routing protocol update, in particular to a method and network equipment for suppressing periodic refreshing and aging of link state messages. Background technique [0002] The routing protocol IS-IS from the intermediate system to the intermediate system is a link state protocol, which mainly informs the topology and routing information through the link state message LSP, and uses the SPF (Shortest Path First, shortest path first) algorithm for routing calculation . [0003] The LSP message records various TLV information, including routing prefix TLV, neighbor TLV, area address TLV, interface address TLV, and protocol support TLV. Each IS system is responsible for generating and releasing LSP messages. When the system generates an LSP, the remaining lifetime of the LSP is set to the maximum lifetime, for example, 1200 seconds by default. The remaining lifetime is the aging time, which will c...

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Problems solved by technology

[0006] That is to say, in order to avoid frequent aging of LSPs in the network, even if there is no change in the content of the LSP, the system will periodically refresh the LSP, which will cause IS-IS devices running on the network to have The exchange of a large number of protocol packets creates instant pressure on the network. At the same time, the periodic refresh of the LSP also consumes the CPU of the local device. In addition, when there are a large number of interfaces and neighbors, the periodic refresh of the LSP on the local device It may cause the LSP refresh flood of the peer device at the same time, causing an instant packet storm on the local device, which may cause the IS-IS protocol to fail to operate normally.

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