have a 3548 and a 3550 each cross-connected and trunking to two 7206s. Looking at spanning-tree info on the two switches, they both declare themselves root bridge for the same vlans. spanning-tree isn't enabled on the routers. up to this point there aren't any redundant vlans across the two switches, which is why i'm guessing there have been no issues. now, however, i'm tasked with setting up redundant connections from a pix failover pair, one to each switch. hsrp will be configured on router subinterfaces for their vlan.
since at the moment the switches aren't passing bpdus to each other is there a way to configure the routers to forward this info and in general how will i go about avoiding bridge loops in this scenario