[c-nsp] link failure detection notification (CFM/LMI/OAM?)

[Jason Lixfeld]

Scenario -

[7600 1 (ES port)] -(T)- [ME3400 1] -(T)- [ME3400 2] -(T)- [7600 2 (ES port)]

- Customer is connected to ME3400 2 on an access port in VLAN 10.
- VLAN 10 is carried on the trunks between both ME3400s to each 7600 ES port
- An xconnect is configured on each ES port under a service instance for vlan 10.
- The Z end of Customer's VLAN has a primary and backup xconnect to 7600 1 and 7600 2, respectively.
- The primary xconnect is via 7600 1.

Problem -

- If the link between ME3400 1 and ME3400 2 goes down, what mechanism is available to notify 7600 1 to teardown it's xconnect so the Z end fires up the backup xconnect?
- Spanning-tree/REP/whatever is not available as a protection mechanism between the 7600s and/or the ME3400s.

I've been looking at CFM/LMI/OAM, but I haven't found any clues yet to determine whether or not it can (directly or otherwise) signal an xconnect to tear itself down if connectivity is broken somewhere within the last mile.

Thanks in advance for any tips.