Sunday, January 12, 2014

HSRP, VRRP, or GLBP

HSRP, VRRP, or GLBP. The big question is...which one? ...and why? Well, me being a Cisco spud, I immediately gravitated to HSRP since that's all I know very well. But before I left, I decided to check out the competition, here's what I found:
Cisco Hot-Standby Router Protocol (HSRP):

  • Created by Cisco, for Cisco in 1994
  • Uses a default hello timer of 3 seconds with a hold timer of 10 seconds
Virtual Router Redundancy Protocol (VRRP)
  • Created by the IETF in 1999
  • Works between multiple vendors
  • Has faster timers than HSRP by default - hello of 1 second, hold timer of 3 seconds
Gateway Load Balancing Protocol (GLBP)
  • Created by Cisco, for Cisco in 2005
  • Identical features to HSRP, but allows an active-active connection that adds load-balancing features
Since this client had no need for load balancing, I decided to go with the VRRP option. The configuration was a piece of cake:
Router1(config-if)#vrrp 1 ip 10.1.6.1 (they obviously used a real IP address)
Router1(config-if)#vrrp 1 preempt
Router1(config-if)#vrrp 1 priority 100
Router2(config-if)#vrrp 1 ip 10.1.6.1
Router2(config-if)#vrrp 1 preempt
Router2(config-if)#vrrp 1 priority 120 

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