We are planning to deploy GLBP on two of our internet routers (Cisco 3845),Both the routers connect to same ISP & bandwidth of both of them is 5MB.Both the routers are terminating on the inside firewall (non-Cisco Fortigate) using an L2 switch.
We are planning to configure default route on the firewall pointing to GLBP VIP (184.108.40.206).I have attached the configuration template(IP addressing has been changed to maintain authenticity).
We are also planning to track the ISP gateway using ICMP on both routers.We would like to know whether there is any ambiguity in the configuration template which we have made.Any suggestions highly appreciated.
I don't see any configuration template however if the only host served by the GLBP pair of routers is the firewall you don't get any load balancing because GLBP works well when multiple clients are present in the vlan: the GLBP AVG answers to ARP requests to the VIP using some algorithm for example in round robin and providing the virtual MAC addresses of AVF (Forwarders only one router is the AVF for a MAC address)
If there is a single host once the FW has done the ARP request for the VIP address it uses this info until the ARP entry expires.
You get redundancy but this can be achieved with HSRP or VRRP.
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