[c-nsp] PA-POS-2OC3 APS Protect and Loopback Visibility

[Tim Densmore]

Hi Folks,

I'm seeing a strange issue with multiple PA-POS-2OC3 cards where once 
the card has been configured for APS, the port that had been the APS 
protect will no longer show loopbacks they way I'd expect.  Looping the 
working side internally (loopback internal or simply looping fiber back 
to the local interface) under the interface config allows testing like 
I'd expect - the interface shows up/up (looped) and I can ping the local 
IP.  The protect side does not respond in the same way - it remains 
up/down.  The only indication that there's a loop present is that the 
POS controller PTB info reflects the local interface rather than the 
interface on the APS remote host.  The interface remains up/down.  Even 
after clearing all APS config with either "no" or "default" the same 
condition remains.  I'm seeing this in multiple chassis (NPE400 and G2) 
and multiple versions of IOS.  If the card is reseated after the APS 
config is torn out, an internal loopback will result in an up/up on the 
interface, but no indication of (looped).

Is there a way to reset the protect interface to a pre-APS state that 
will allow loopbacks to show?  This makes remotely troubleshooting bad 
fiber/bad SFP/bad loop issues very difficult in cases where we're seeing 
*RDI or *AIS back from the provider.

Thanks,

Tim