User Manual UMN:CLIV81024539.9 Virtual Router Redundancy Protocol (VRRP)Virtual router redundancy protocol (VRRP) is configuring Virtual router (VRRP Group)consisted of VRRP routers to prevent network failure caused by one dedicated router.You can configure maximum 255 VRRP routers in VRRP group of V8102. First of all, de-cide which router plays a roll as Master Virtual Router. The other routers will be BackupVirtual Routers. After you give priority to these backup routers, the router serves for Mas-ter Virtual Router when there are some problems in Master Virtual router. When you con-figure VRRP, configure all routers in VRRP with unified Group Id and assign unified Asso-ciated IP to them. After that, decide Master Virtual Router and Backup Virtual Router. Arouter that has the highest priority is supposed to be Master and Backup Virtual Routersalso get orders depending on priority.Fig. 9.43 VRRP OperationIn case routers have same priorities, then a router, which has lower IP address, gets theprecedence. Fig. 9.43 shows an example of configuring three routers which have IP ad-dresses, 10.0.0.1/24, 10.0.0.2/24 and 10.0.0.3/24 for each one as Virtual router by Asso-ciated IP, 10.0.0.5/24. If these three routers have same Priority, a router, which has thesmallest IP, address, 10.0.0.1/24 is decided to be Master Router. Also, switches and PCsconnected to the Virtual Router are to have IP address of Virtual Router, 10.0.0.5/24 asdefault gateway.
