I have two ISP's providing VPN links between my HQ and three remote offices, we are using broadband links and Leased Lines in all the sites, the idea for this is to provide route redundancy/failover in case one router fails.
I did some research on how best to achieve this, and two Cisco technologies were highly recommended for this; Gateway Load Balancing Protocol (GLBP) and Hot Standby Router Protocol (HSRP).
GLBP is cisco's newest Gateway redundancy feature and it operates @ layer 2. It elects one of the members of the GLBP Virtual Gateway, and this acts as the ARP responder.
HSRP is a cisco proprietary redundancy protocol for establishing a fault-tolerant default Gateway. The protocol establishes a framework between network routers in order to achieve default gateway failover. If the primary gateway should become inaccessible, in close association with a rapid-converging routing protocol like BGP, EIGRP or OSPF.
more reading : Redundant Protocols - GBLP, HSRP , HSRP vs BGLP vs VRRP , How to Configure HRSP for Load Balancing
Of the two protocols, I had to settle for HSRP as I only have a few client computers in remote sites that one link could easily handle so load balance is not necessary.
Sample Config for Site A
Router A
int FastEthernet0/0
ip address 1.0.0.1 255.0.0.0
standby 1 preempt
standby 1 ip 1.0.0.3
standby 1 priority 110
Router B
int FastEthernet0/1
ip address 1.0.0.2
standby 1 preempt
standby 1 ip 1.0.0.3
Router B - f0 = 7
2 comments:
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Nice post. Thanks for content creator.
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