VRRP: Tune Advertisements to 3 Seconds

Bundle lab · $29.99

Advanced CCNP VRRP lab: standardize the VRRP advertisement interval to 3 seconds on a shared user VLAN. Two IOS routers (R1, R2) and two hosts connect to a single access switch on VLAN 10 (10.0.10.0/24). Both routers share VRRP group 1 and the same virtual IP 10.0.10.254 so hosts keep one default gateway. R1 is the master via priority 110; both routers explicitly set 'vrrp 1 timers advertise 3' to enforce a consistent master advertisement rate and backup master-down detection window. Verify with 'show vrrp' (Advertisement interval 3.000 sec) and host pings to the VIP.

Learning objectives

• Configure VRRP with a shared virtual IP on two routers in one LAN
• Deterministically set the master router using VRRP priority
• Standardize the VRRP advertisement interval to 3 seconds on both routers
• Validate VRRP state and timers with IOS 'show vrrp'
• Confirm host default gateway reachability via the VRRP VIP

Troubleshooting focus

• Group number or virtual IP mismatch prevents VRRP peering
• Timers configured on only one router cause non-standard behavior after role changes
• PC default gateway pointed at a physical router IP instead of the VRRP VIP
• Router LAN interface down or in the wrong VLAN on the switch
• Subnet mask mismatch on the router LAN interfaces versus the hosts