VRRP Object Tracking for Uplink Failover

Bundle lab · $29.99

Configure VRRP with interface object tracking so the virtual gateway fails over when the active router loses its upstream link, avoiding black-holing. The site LAN (VLAN 10) uses a single virtual default gateway (10.0.10.254) shared by two IOS routers (R1, R2). A separate access switch (SW) bridges the LAN. Both routers uplink via Ethernet0/1 to a second switch (CORE) on VLAN 99 to represent the upstream path. R1 is the intended VRRP master (priority 110). You will create a track object that monitors R1's uplink (Ethernet0/1) and decrements its VRRP priority by 20 if the link fails, allowing R2 to preemptively take over as master. The lab grades the deterministic VRRP configuration: common group and virtual IP on both routers, R1 priority 110, the global track object, and the 'vrrp 1 track 1 decrement 20' tie-in on R1.

Learning objectives

• Configure VRRP with a shared virtual IP on two routers for a single LAN
• Deterministically select the VRRP master using priority (R1=110, R2=100)
• Build and reference a global track object to monitor an uplink interface
• Verify VRRP role, priority, and tracking state with IOS show commands
• Explain how VRRP preemption and priority decrement avoid black-holing

Troubleshooting focus

• Mismatch in VRRP group number or virtual IP prevents the pair from forming
• R1 not master due to missing priority or unexpected decrement state
• Track object defined but not referenced on the VRRP interface
• Tracking the wrong interface or wrong object number — no priority change
• VRRP suppressed by a shutdown or an administrative down state on the LAN interface