I'm proposing to install two pix firewall in a lan based failover configuration. Each firewall will be physically installed at either end of a DWDM link. I'm dedicating interfaces and vlan's for both the 'failover' and 'stateful' connections on each switch at either end of the DWDM link. However, the actual link between both switches on the DWDM will need to be trunked. Can I expect to see any issues with failover in this configuration?
I can't comment on the DWDM side of things but as long as it functions as a trunk link then i can't see why you would have any issues. In effect it is often what people do on a pair of resilient switches connected by a trunk link with a pix on each switch. We have this setup in our datacentre.
As long as there is enough bandwidth on the trunk it should be fine.