We have 3 sites over an MPLS. Each site has 2 x Cisco 2911's running HSRP. Each site has a tunnel interface from it's local site to the remote site over the MPLS. The tunnel interfaces are mirrored on each of the 2911 pairs where source IP is the local virtual IP and destination IP is the remote virtual IP. We are running OSPF across the network and all seems to be fine; the primary router has the tunnel interface up, the secondary router has the tunnel interface down (not admin down) and hence, neighbor relationships are correctly established. One of the sites has a 2911 and a 3725 in HSRP. From this site, we are having difficulty with OSPF whereby the neighbor site will build a relationship with the primary router, then go down, then build a relationship with the secondary router, then go down and etc; as a result, our logs are filled with neighbour adjacency alerts.
I should point out that the 3725 has FE ports and the 2911 has Gib ports; i've tried manually setting the tunnel interfaces with priorities but am still unable to make this work. I'm beginning to think we will need another 2911?
We are looking to have the capability whereby if the primary router goes down, the standby router kicks into gear, OSPF routes learned and business as usual.