VRRP

VRRP is currently in version 3, it’s a standards based way to perform FHRP.

Active Router: The router performing as the default gateway
Backup Router: The routers waiting to transition to become default gateways.

Details

Default timers: 1s / 3 seconds
224.0.0.18

Example

R5# show vrrp brief
Interface          Grp Pri Time  Own Pre State   Master addr     Group addr
Gi0/0              56  100 3609       Y  Backup  192.168.56.6    192.168.56.56

Config

interface GigabitEthernet0/0
 ip address 192.168.56.5 255.255.255.0
 ipv6 address 2001:DB8:0:56::5/64
 vrrp 56 ip 192.168.56.56

References

Network Services Configuration Guide, Cisco IOS XE 17.x - Configuring VRRP Cisco IOS XE 17 - Cisco

RFC 9568: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6 | RFC Editor