Router A is responsible for answering ARP requests sent to the virtual IP address.
If Router A becomes unavailable, Router B will forward packets sent to the virtual MAC address of Router A
If another router were added to this GLBP group, there would be two backup AVGs
Router B is in GLBP listen state.
Router A alternately responds to ARP requests with different virtual MAC addresses.
Router B will transition from blocking state to forwarding state when it becomes the AVG