Knowledge Base

Design & Configure

NHRP: GLBP config (Cisco)

Technology: Routing
Area: NHRP
Vendor: Cisco
Software: 12.X , 15.X
Platform: Catalyst platforms, Routing platforms

Gateway Load Balancing Protocol (GLBP) is one of the NHRP kind protocols that protects traffic from a router or circuit failure. GLBP behaves very similar to Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP). GLBP communicates over Layer 2.

To configure GLBP (basic configuration), use the following command on first router (primary):

Router1(config)# interface GigabitEthernet  0/1
Router1(config-if)#ip address
Router1(config-if)# glbp 10 ip
Router1(config-if)# glbp priority 150
Router1(config-if)# exit

Configure the backup GLBP router:

Router2(config)# interface GigabitEthernet  0/1
Router2(config-if)#ip address
Router2(config-if)# glbp 10 ip
Router2(config-if)# exit

Hosts will use as active address (default gateway). Default GLBP priority is 100, the higher wins and is elected on active router. If priorities are the same, the higher priority wins the active gateway election.


Check also how to configure VRRP on Cisco IOS.

Author: Marcin Bialy