[c-nsp] ATM multilink issue

[Adam Greene]

In case the information is useful to anyone, it appears the MLP degradation
issue we were facing was due to nothing more than a bad line from Verizon.

There's still a mystery about why this platform is reporting our WIC-1ADSL
cards as PA-1C-P's, but I guess if it works, it works!


----- Original Message ----- 
From: "Adam Greene" <maillist at webjogger.net>
To: <cisco-nsp at puck.nether.net>
Sent: Wednesday, June 25, 2008 5:07 PM
Subject: [c-nsp] ATM multilink issue


> Hi,
>
> I am troubleshooting an ATM multilink issue.
>
> The first (3) ATM lines I add to the bundle work great. I add a fourth
> line, and performance degrades horribly.
>
> I'm working with a 3640, 128MB RAM, 12.3(26), with the following cards:
>
> - NM-0FE2W: (2) PA-1C-P
> - NM-2FE2W: (2) PA-1C-P
>
> (there's also a NM-1E2W with (2) WIC-1DSU-T1's in the unit)
>
> I can bundle the (2) ATM lines from the NM-0FE2W and (1) from the NM-2FE2W
> just fine, but when I add the second line from the NM-2FE2W, performance
> is terrible.
>
> A "debug multilink events" shows that upon adding the fourth line, the
> following starts happening:
>
> *Jun  24 18:30:43.944 edt: Mu1 MLP: Begin bit lost, discard fragment
> 15F75B
> *Jun  24 18:30:43.944 edt: Mu1 MLP: Begin bit lost, discard fragment
> 15F75C
> *Jun  24 18:30:43.944 edt: Mu1 MLP: Begin bit lost, discard fragment
> 15F75D
> *Jun  24 18:30:43.976 edt: Mu1 MLP: Received lost fragment seq 15F756,
> expecting 15F7FE
> *Jun  24 18:30:43.980 edt: Mu1 MLP: Received lost fragment seq 15F75A,
> expecting 15F7FE
> *Jun  24 18:30:43.980 edt: Mu1 MLP: Received lost fragment seq 15F75E,
> expecting 15F7FE
> *Jun  24 18:30:43.984 edt: Mu1 MLP: Lost fragment 15F7FE (all links out of
> sequence)
>
> Could I just have a bad line from Verizon? Or a bad card? Or have I hit
> some hardware limit on the 3640?
>
>
> Thanks
> Adam
>
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