Method and device used for synchronization after restart of FC (fiber channel) exchanger

Abstract

The invention provides a method and a device used for synchronization after the restart of an FC (fiber channel) exchanger. According to the invention, after the FC exchanger is restarted, when a neighbor FC exchanger establishing an adjacency relationship with a host computer before the host computer is restarted is discovered, the adjacency relationship with the neighbor FC exchanger is maintained immediately; the neighbor FC exchanger is requested to carry out the initialization synchronization of an LSR (link state record) on the host computer in a condition that the adjacency relationship is kept; therefore, a route from other FC exchanger to the host computer can be prevented from being canceled, so as to guarantee that the route from the other FC exchanger to the host computer is not changed; moreover, the FC exchanger subjected to the restart can learn the same LSR before the restart of the host computer through the initialization synchronization of the LSR; therefore, a recalculated route from the host computer to the other FC exchanger is also the same before the host computer is restarted; further, the FC exchanger subjected to the restart triggers route calculation after the initialization synchronization is completed; and therefore, the calculated route can be prevented from being frequently changed along with the process of the initialization synchronization.

Description

technical field [0001] The invention relates to the routing and forwarding technology of the FSPF (Fabric Shortest Path First, optical fiber shortest path first) protocol, in particular to a method and device for synchronizing after restarting of an FC switch. Background technique [0002] The FSPF protocol is a link-based dynamic route discovery protocol used by FC networks. Each FC switch that supports FSPF protocol can use the LSR (Link State Record) generated locally to describe the local and neighbor FC The relationship between switches, and the use of SW_ILS (Switch Fabric Internal Link Service, switch fiber interactive connection service) protocol LSU (The Link State Update, link state update) message and LSA (The Link State Acknowledgment, link state confirmation ) packets and neighboring FC switches to synchronize their respective LSRs, so that each FC switch can learn the topology of the FC network through the relationship described by the LSR, and then realize the...

AI Technical Summary

Problems solved by technology

[0024] However, the restarted FC switch will roll back its status after restarting, and re-initiate neighbor discovery with the neighbor FC switch, which will cause the neighbor FC switch to also roll back the state, and cause the Adjacency relationship established with the neighbor FC switch At this time, all the routes related to the restarted FC switch in the FC network will be deleted, and, during the period of initialization synchronization after re-discovering neighbors, the recalculated routes related to the restarted FC switch Relevant routes will also change frequently with the initial synchronization process, so that the routes in the FC network will change due to the restart of the FC switch

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