Enable Preempt Mode

See the first figure in VRRP Topology for the toplology in this example. You can configure VRRP to preempt the existing router. This means that if a new VRRP router is added to the network with priority higher than the existing routers, then the new router becomes the master. If preemption is disabled, then the new router will not become a master. This router becomes master only when the current master is down, that is, only when it does not receive any advertisement packets from the current master. By default, preempt mode is enabled.

1. In switch 1 and switch 2, enable preempt mode.

   SEFOS# configure terminal
   SEFOS(config)# router vrrp
   SEFOS(config-vrrp)# interface vlan 2
   SEFOS(config-vrrp-if)# vrrp 1 preempt
   SEFOS(config-vrrp-if)# end

2. View the preemption status in switch 1.

   SEFOS# show vrrp interface vlan 2 detail
   vlan2  - vrID 1
   ---------------
   State is Master
   Virtual IP address is 12.0.0.5
   Virtual MAC address is 00:00:5e:00:01:01
   Master router is 12.0.0.5
   Associated IpAddresses :
   ----------------------
   12.0.0.5
   12.0.0.6
   Advertise time is 1 secs
   Current priority is 200
   Configured priority is 200, may preempt
   Accept Mode Disabled

3. View the preemption status in switch 2.

   SEFOS# show vrrp interface vlan 2 detail
   vlan2  - vrID 1
   ---------------
   State is Backup
   Virtual IP address is 12.0.0.5
   Virtual MAC address is 00:00:5e:00:01:01
   Master router is 12.0.0.5
   Associated IpAddresses :
   ----------------------
   12.0.0.5
   12.0.0.6
   Advertise time is 1 secs
   Current priority is 150
   Configured priority is 150, may preempt
   Accept Mode Disabled