- Provides gateway redundancy by using a singe IP and multiple MAC
- Can be 4 routers in a group
- Group members communicate to 224.0.0.102 on UDP-3222
- Hello messages sent every 3 seconds by default
- Group members will elect a Active Virtual Gateway (AVG), the other routers will be bakcup AVG
- AVG will assign virtual MAC to other routers known as Active Virtual Forwarders (AVF)
- Each ACF assumes responsibility for forwarding packets sent to the virtual MAC assigned to it by the AVG
- AVG is responsible for answering ARP requests for the VIP
interface fa0/1 glbp 1 load-balancing host-dependant #other options are round-robin, and/or weighted glbp 1 authentication text glbp 1 timers msec msec glbp 1 ip 10.1.1.1 glbp 1 priority 255 glbp 1 preempt glbp 1 timers redirect glbp 1 weighting track [decrement] glbp 1 wighting 110 lower 95 upper 105
show glbp