GLBP in Router Cisco

OK Let's Start

Here are the minimal configuration to make GLBP on the Router.

R1#conf t
R1(config)#int gig 0/1
R1(config-if)#glbp 10 ip 10.1.1.1
R1(config-if)#glbp 10 priority 110
R1(config-if)#glbp 10 preempt
R1(config-if)#glbp 10 authentication md5 key-string $3cr3T

R2#conf t
R2(config)#int gig 0/1
R2(config-if)#glbp 10 ip 10.1.1.1
R2(config-if)#glbp 10 preempt
R2(config-if)#glbp 10 authentication md5 key-string $3cr3T

Done...!

 

GLBP is First Hop Redudancy from Cisco Propietary, and the default preemption is Disable. So, we need to explicit define to Enable. 

The higher priority make Router as Active, the lowest will make as Standby.