We are streching vlans on our WAN Layer between 2 of our datacenters terminating on 6509 via DWDM. The reason why so we can have firewalls in HA pair, one per datacenter connected via the layer vlan streched between datacenters also loadbalancers and BGP Routers. The BGP routers are IGBP peers connected to streached vlans on the same subnet.
My big concern is spanning-tree loops can affect live services.
Is cisco LAM (LOCAL AREA MOBILITY) recommended instead of streaching vlans between datacenters WAN?