Switching method and device of main/standby router in virtual route redundancy protocol

Abstract

The invention provides a switching method and a device of a main / standby router in a virtual route redundancy protocol. The method comprises the following steps: the main router in the virtual router group receives the first announcement information which is sent by the first router except for the main router in the group and which carries the first dynamic priority value of the first router; the main router compares the first dynamic priority value with the own second dynamic priority value, if the first dynamic priority value is less than the second dynamic priority value, then the main router state is maintained; and the first dynamic priority value and the second dynamic priority value are respectively the number of the message of which the destination MAC address is the virtual MAC address of the virtual router group which is respectively received in the recent announcement period by the first router and the main router. By introducing the mechanism of dynamic priority to the VRRP protocol, the invention avoids network oscillation caused by unnecessary switching of main / standby router, thus improving the stability of the network.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a switching method and equipment for active and standby routing equipment in a virtual routing redundancy protocol. Background technique [0002] With the development of Internet technology, people put forward higher and higher requirements for the reliability and stability of the network. The Virtual Router Redundancy Protocol (VRRP) technology emerged as the times require, which is a method to improve network reliability. Sexual better technical solution. As a fault-tolerant protocol, VRRP can ensure that when the next-hop router of the host in the LAN fails, it can be replaced by another router in time, so as to maintain the continuity and reliability of communication. [0003] Usually, in the VRRP protocol, a virtual router group consists of a master router and several backup routers in the same network segment. Among them, the main router realizes the real function ...

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Problems solved by technology

[0004] However, the inventor found in the process of invention that in practical applications, the main router may have a communication link failure or its own function failure. At this time, the backup router cannot receive the notification information sent by it, and will elect a new main router. router

And when the original master router returns to normal, if the new master router is generated due to the communication failure of the original master router, there will be two master routers in the group, causing a new round of master router competition, and due to the static priority of the original master router higher than the new master router, the original master router will re-compete successfully, causing the role switch of the master router in the group

And if the new master router is caused by the original master router's own failure, two situations will occur at this time: if the original master router has the highest priority level 255, it will directly enter the master router state, causing the role switch of the master router; The original master router does not have the highest priority level, because its static priority is always higher than the new master router, in the preemption mode, the original master router will also compete to become the master router, causing the role of the master router to switch

[0005] However, in practical applications, the switchover process of the master router at this time is completely unnecessary, because the network link has been restored before the original master router returns to normal, but this unnecessary switchover process of the master router has once again caused The network is unstable and causes the network to oscillate

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