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GLBP dual path balancing

I have a site with two MPLS circuits that I am currently loadbalancing via GLBP. The setup is: I have a switch plugged into each og the MPLS routers; MPLS1 =, MPLS2 is, GLBP is, and all of my PCs point to I can see via my monitoring software that the circuits on MPLS1 and 2 are load balanced. I am planning on adding a single firewall to the switch, and re-IPing the network. The addresses listed will all stay the same. The firewall will have an outside IP of, and my new internal range will be ( is also /24).

Question: will the firewall only arp for once, and then forward all traffic to that single AVF? If not, then I think I'll be happy and all will work as is does now, just behind a FW. If it will choose one path in this setup, what changes would I need to make to have it still load balance?


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Cisco Employee

GLBP dual path balancing

I guess only L3 routing (e.g. EIGRP or OSPF) on FW can help you to keep load-balancing. From the L2 perspective FW will always use single route.


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