How GLBP will learn if wan link is down but ether net is up

Unanswered Question
Jun 22nd, 2010


I want to configure the glbp on two routers to load balancing on WAN link, We have 100 mb link, each terminated on cisco 2951 with ethernet o/p from service providers Mux. Since ethernet will be always up how glbp will learn the wan link is down & forward the traffic to another router...

Need configuration guidance.....

Nilesh G.

I have this problem too.
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Giuseppe Larosa Tue, 06/22/2010 - 23:56

Hello Nilesh,

in these cases you can use reliable static routing with object tracking and you can use IP SLA. The same idea can be used to modify GLBP weighting


and object tracking with GLBP you can reduce weighting if the IP SLA test fails.

Hope to help


gatlin007 Wed, 06/23/2010 - 07:23

If this is in your WAN and you have devices capable of routing on each side it would be more supportable to use a dynamic routing protocol such as RIP, EIGRP or OSPF instead of static routes based on IP SLA.



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