Virtual Router Redundancy Protocol (VRRP)
- Standards-based alternative to HSRP, defined in RFC 2338.
- VRRP refers to the active router as the master router; all others are in the backup state.
- VRRP virtual MAC from the range 0000.5e00.01XX where the last eight bits represent the group number.
- VRRP advertisements are multicast to 224.0.0.18, using IP protocol 112.
- VRRP advertisements are sent in 1-second intervals by default; backup routers can optionally learn the interval from the master router.
- VRRP routers will preempt the master by default if they have a higher priority.
- VRRP is unable to track interfaces and concede an election.
VRRP configuration is very similar to HSRP configuration:
vrrp 1 ip [virtual_ip]
vrrp 1 timers {advertise [hello]learn}
vrrp 1 priority [priority]
vrrp 1 preempt
vrrp 1 authentication md5 key-string [password]
vrrp 1 track [object]
decrement
Verification
show vrrp [brief]
