Cisco CCNP and CCIE Study Notes

HSRP and GLBP are similar protocols used for redundancy and load-sharing of routers on a subnet. (VRRP is the non-proprietary version of HSRP; HSRP is a Cisco-specific protocol.) HSRP requires a little more configuration and multiple groups to achieve load balancing while GLBP does the same thing with less configuration. Also, the load balancing that GLBP can achieve can better than with HSRP because with HSRP the load balancing is done manually and not related to actual traffic at any point in time.

The reason I am even thinking about HSRP and GLBP right now is because there was a question on one of the Cisco newsgroups if running both HSRP and GLBP on the same routers would work fine. I thought about it a bit and could not see why anyone would want to do that. In any case, I was curious about this and so I decided to try it on my routers and did just that. I found that the two protocols do work fine when configured simultaneously on the same routers!

Here are the configs I used on the two HSRP routers

Router 1

interface Ethernet1
 ip address 192.169.0.2 255.255.255.0
 no keepalive
 standby 2 ip 192.169.0.254
 glbp 10 ip 192.169.0.253

Router 2

interface Ethernet1
 ip address 192.169.0.3 255.255.255.0
 no keepalive
 standby 2 ip 192.169.0.254
 standby 2 priority 150
 standby 2 preempt
 glbp 10 ip 192.169.0.253