RE: [nsp] 12.0(12.??)S and PA-A3 problem

From: Martin, Christian (
Date: Tue Oct 03 2000 - 19:47:09 EDT

I hate to say it, but this may be the dreaded sleeping pvc...

This is similar to an output stuck condition, whereby the transmit ring
fills and doesn't drain. Very ugly...


> -----Original Message-----
> From: Jeff Bartig []
> Sent: Tuesday, October 03, 2000 12:03 PM
> To:
> Subject: [nsp] 12.0(12.??)S and PA-A3 problem
> Hello,
> I've been experiencing problems with 12.0(12)S and interim releases
> with a PA-A3 OC3MM port adapter. I'm wondering if anyone else is
> seeing similar problems.
> I first experienced this problem with 12.0(12)S on a 7206. Certain
> VCs stop passing traffic or experience very high packet loss.
> Other VCs on the same physical interface have no problems. Nothing
> is logged besides OSPF neighbors being lost. It is normally the
> busiest VC that experiences the problem. It can be temporarily
> fixed by performing a shut/no shut on the physical interface. The
> problem happens every 20-30 minutes. While the problem is happening,
> a "show atm vc vcd#" command will show output drops increasing.
> I've never experienced this problem while running 12.0(11)S3.
> I thought I might be encountering CSCds01236, so I tried 12.0(12.6)S1
> and 12.0(12.6)S2 on this 7206. I experienced the problem with both
> versions, even though it is suppose to be resolved. Today, I saw
> what looks like this same problem with a PA-A3 in a VIP2-50 while
> running 12.0(12.6)S1.
> I've had a case open with the TAC for a while. Currently, the TAC
> is claiming that this problem and another PA-A3 problem I am having
> are being caused by my old revision PA-A3 (HW rev 1.0, Board rev
> A0, Part# 73-2430-03 if anyone is interested). I've been shipped
> a replacement and am waiting for a maintenance window to get it
> installed. The TAC, though, can't point to any DDTS or field notice
> that states there are problems with the revision PA-A3 that I have.
> He didn't seem too excited to hear that if this does fix the problem,
> I'll be asking for replacements for all of my backbone PA-A3s,
> since they are all the same revision.
> If anyone has seen this problem, I would be interested in hearing
> about it. Could you include "show diag" output for the PA-A3, so
> I can see what revision you have.
> Thanks,
> Jeff
> --
> Jeff Bartig | University of Wisconsin - Madison
> 1210 W Dayton, Rm B263 | Division of Information Technology
> Work Phone: (608) 262-8336 | Network Engineering Technology
> E-Mail: |

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