Load Balancing with GLBP

[Shahzad Qadir]

Hi All,

Is it possible to use glbp to load balance when I have one router connected to two upstream routers and these routers are configured with GLBP. As far as I know there got to be mulitple hosts on the segment for GLBP to do any kind of load balancing....

Thanks

[John Blakley · Accepted solution]

In this scenario, I don't believe it's possible. GLBP works by assigning different virtual mac addresses to hosts in order to achieve load balancing. If you only have the one router behind the glbp group, you'll only have 1 mac address listed in the arp table for the virtual address/mac pair that the AVG handed out to you...

Aside from that, you could configure policy routing on the single router and forward them outside of your normal routing table. This could work for you...

HTH,
John

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[Gregory Snipes]

GLBP does not provide any kind of per packet load balancing, it balances hosts. Your router is only one host so even with GLBP it will only use one gateway.

If you have control of all this equipment the easiest we to achive what you are looking for is to just configure a routing protocal that supports equal cost load balancing, like OSPF or EIGRP between the three routers.

If you do not have control of all the routers policy routing is the way to go.