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VRRP protocol and experimental configuration

2022-07-26 06:00:00 【Au poplar】

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Editing experiment II （ Combined with layer 3 switching ）

VRRP Definition

Virtual routing redundancy protocol is abbreviated as VRRP agreement , The user terminal in LAN usually adopts the form of configuring a default gateway Access to external networks , If the default gateway device fails at this time , Will be Disconnect network access of all user terminals , This is likely to bring inconvenience to users Predictable losses , So you can deploy multiple gateways to solve Solve the problem of single point of failure , So how to make multiple gateways work together, but Without conflict, it has become the most urgent problem to be solved . therefore VRRP emerge as the times require , It can realize the backup of gateway , It can also solve the problem of conflict between multiple gateways .

VRRP How the protocol works

(1) The router in the virtual router is selected according to the priority Master. Master The router sends free ARP message , Make your own virtual MAC Address notification to the device or host to which it is connected , So as to undertake the task of message forwarding ;

(2) Master Router sends periodically VRRP message , To publish its configuration information ( Priority, etc ) And working conditions ;

(3) If Master Router failure , In virtual router Backup The router will re elect the new... Based on priority Master

(4) When the virtual router state switches ,Master The router is switched by a device Change to another device , new Master The router simply sends A portable virtual router MAC Address and virtual IP Free address information ARP message , In this way, the host or device connected to it can be updated Of ARP Related information . The host in the network is not aware of Master The router has switched to another device .

(5) Backup The priority of the router is higher than Master Router , from Backup How routers work ( Preemptive mode and non preemptive mode ) Decide whether to re elect Master.