I have 2 catalyst 4507 as the backbone, and 2 router 2610xm running dlsw: each one connected to each 4507.
Vlan bridging is doing in dot1Q sub-interfaces at the 2610xm, and the protocol I use is vlan-bridge.
With the bridging active at the same time in both 2610xm I have no problems with loop. But when I run dlsw in both routers, and the peers become connected, I receive in both 4507 the message:
%C4K_EBM-4-HOSTFLAPPING: Host 02:00:8E:C9:0A:80 in vlan 16 is f
lapping between port Gi3/6 and port Gi3/2.
These are the ports than connect to a 2610 xm and to the other 4507 (that has connected the other 2610xm).
Cisco says this is indicating a STP loop.
My question: is it wrong this topology?, how can I get redundancy to dlsw service with 2 routers?