Satish, to add more here,
You want redundancy towards your PE, and you would have a dual homed CE, so the CE2a and CE2b is not applicable in your scenario.
Now MR-APS and PW redundancy are two different and independent features.
1) For the PW redundancy to work it requires two physical interfaces where it
can do the PW label imposition. Of the two one PW is primary and the other
is a pure backup.
2) In MR-APS it providing a feature to take advantage of the APS feature built into
carrier systems. where in the similar configuration which resides on the primary
interface can be used on the secondary interface, so that when due to failure
when your MUX switches over the path to the protected path, the protect interface on
your side should have the same configuration so that it can swicth the data to the
same remote side.
3) Now when you want to club these features together, you can use both the interfaces
on the PE side one as primary for APS which is also the primary for PW in terms
of configuration. And the secondary for APS would be the secondary for your PW as well.
4) You need to be careful of the Holdtime configured for APS and Backup-Delay for PW Redundancy.
The holdtime for APS should be lower than the PW Backup-Delay.
5) Now I believe why this will work is the APS switchover to the protected interface happens
based on SDH/SONET signalling which is transparent to the PW, and is interpreted by the PE edge
device and is not transported across the PW. So upon the receipt of the alarms the APS switchover
is done on the configured hello/holdtime. And then your PW redundancy should kickin and enable the
backup PW. By the time which the protected interface would be up and your PW should be fucntionaly.
Do try it out and post the results back.
HTH-Cheers,
Swaroop
