[nsp] ATM interface errors

[Charles Sprickman]

Hi,

Perhaps someone here familiar with DSL agg. on a PA-A3 can help me out
here.

I have a DS3 ATM backhaul to Covad for DSL.  Last night I saw it drop out
from the customer end, so I dialed in and had a look at the atm interface
while I was waiting on the Covad NOC to pick up the phone.

The interface was showing up/up, but zero input packets, zero CRC errors,
zero input errors.  I could see a loop when Covad looped the BPX we're
plugged into and vice-versa (DS3 is just a x-conn from our cabinet to
theirs), but still no traffic.  Clients with OAM enabled were showing OAM
cells out, but none in.

Looking more closely at the interface stats, I saw that the "ignored"
count was incrementing rapidly.  I bounced my side and everything slowly
came back to normal.  What does "ignored" indicate on this interface?  We
double-checked we were both set to "cbitplcp" and had cell-scrambling
enabled.  According to the NOC, no changes tonight, and all they saw was
the circuit bounce up/down at about the time I noticed my line was dead.

Any ideas what may have happened?  The circuit was (by my account) running
clean.  Covad has no idea of what may have caused this, nor what we can do
to make sure it doesn't happen again...

Any input appreciated.

Thanks,

Charles

--
Charles Sprickman
spork at inch.com