When I do a sho int fcx/x counters, I can see information that really doesn't make much sense to me and its not explained anywhere that I can easily find.
One in particular is:
<number> bb credit transitions from zero.
I also see the same <number> LLR.
I have 2 x 9509's with ONS 15454 in the middle. Both 9509's are reporting the same number of BB Credit transitions from zero on the ISL (and Port Channel stats) and one switch as <number> for output LRRs and the other switch has <number> for input LRR.
This might be pure coincidence but I want to see if running out of bb credits (which is extremely unlikely over this distance) is causing the LRR events.
I believe LRR events (where is this documented) are caused by some sort of media error outside the 9509 in this case. I can't get any stats on the ONS as the person running them just plain wont look.
I get the feeling that I am getting a glitch in one of the DWDM links but I need to cover all bases.