we have two 6500's on two campus separated by a mile with aerial fiber connecting the switches. We have contracted with a local provider to supply a redundant fiber path. We pay a monthly fee to have the fiber and will pay an additional fee if we have to use the fiber. How can I configure the switches to have the aerial fiber active and the dark fiber in standby only to be active in the event the aerial fiber is damaged? Each switch is in its own vtp domain. We have vlan 204 on each switch. 172.28.1.1 on one switch and 172.28.1.2 on the other switch to route between the switches.
Do you still want VLAN 204 to span between the switches ? I assume that you have layer 3 point to point link between your switches.. in that case, you can create layer 3 interfaces on the switchport, for point to point connection...
interface gig 1/1
description *** primary connection to switch 2****
ip address x.x.x.x 255.255.255.252
udld port aggressive
interface gig 1/2
description **** backup port *****
ip address y.y.y.y 255.255.255.252
** select appropriate delay values to make gig 1/2 as backup circuit for routing...
router eigrp 10
network x.x.x.x (WAN network)
network 192.168.x.x (LAN networks)
and it really depends on how you want to route your standby routes.. try first with UDLD with static routes.. it might work since UDLD shuts the port down in case of fiber issues (TX or RX) and static route can disapper...
Hope this helps.. all the best