VRRP Object Tracking for Uplink Failover
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.