Cisco Jan 2, 2013
  • Provides gateway redundancy by using a singe IP and multiple MAC
  • Can be 4 routers in a group
  • Group members communicate to 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 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


Rob Edwards

Northern (UK) chap focusing on platforms, automation, cloud and cloud native applications. Recovering network engineer, although it turns out networking is as important, if not more, now than before!