[j-nsp] Debugging SONET (OC-3) errors

[Amos Rosenboim]

Hello Chris,

If I remember correctly then B3 errors are associated with clocking  
alignment along the circuit.
This also correlate to what you are saying about passing through 7  
carriers.

Regards

Amos Rosenboim
amos at oasis-tech.net



On Aug 4, 2008, at 9:54 PM, Chris Adams wrote:

> I have an OC-3 (POS running PPP) between two POPs (an M10i at each  
> end)
> getting errors, and this is the first time I've had to debug errors  
> on a
> SONET link.
>
> I am seeing BIP-B3 and REI-P incrementing in spurts on the Z end (e.g.
> 99 BIP-B3 and 45 REI-P, both showing 2 seconds), as well as ES-P and
> ES-PFE matching the seconds (2 in since I cleared the counters).  No
> other error counters are incrementing (no section or line errors at
> all).  I have seen some errors at the A end as well, but not as  
> many or
> as often.
>
> When I get a spurt of errors, both ends will show an interface flap  
> (at
> least most of the time; I'm not sure this is 100% of the time or not).
>
> Reading various docs, this means there is a problem somewhere between
> telco devices with the transmission from the Z end to the A end.  Is
> that correct?
>
> I opened a telco ticket, but they pretty much blew it off.  I know
> little about SONET so I am having trouble telling them what to check.
> I'd like to avoid intrusive testing if possible (since this is a major
> circuit for us).
>
> Part of the problem is that this circuit goes through 7 (yes 7!)
> different carriers, and I am not sure that the telco that owns the  
> whole
> thing is looking at anything other than the loop on the Z end (the  
> only
> piece they actually own).
>
> Any suggestions?
> -- 
> Chris Adams <cmadams at hiwaay.net>
> Systems and Network Administrator - HiWAAY Internet Services
> I don't speak for anybody but myself - that's enough trouble.
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