[c-nsp] Packet drops on MPLS xconnect

[Tom Storey]

Nevermind, I reckon Ive got it sorted.

MTU strikes again. :-)

> Hi all,
>
> I am experiencing packet drops in the tx direction of an MPLS based
> xconnect.
>
> The xconnect is between a 7304 NPE-G100 and a 7206VXR NPE-G1, and only
> seems to be an issue with tx from the 7304. rx on the 7304 is fine, and tx
> and rx on the 7206 are also fine.
>
> Moving the xconnect from the 7304 onto another 7206VXR NPE-G1 resolves the
> issue.
>
> Ive tried an IOS upgrade, reboot, rebuild of the xconnect, but to no
> avail.
>
> Ive also tried turning on various debug commands but wasnt able to obtain
> any usefil hints as to what the problem is.
>
> Here is part of the output of a "show mpls l2 vc detail" for the xconnect:
>
>   VC statistics:
>     packet totals: receive 545, send 485
>     byte totals:   receive 72955, send 61850
>     packet drops:  receive 0, seq error 0, send 60
>
> This was captured after the reboot so there isnt much happening, but you
> can see there are tx packet drops.
>
> Ive used various debug commands to try and get something to work on,
> including the following:
>
> debug mpls l2 vc event
> debug mpls l2 vc fsm
> debug mpls l2transport signaling message
> debug mpls l2 packet error
>
> I was hoping the last one would reveal something interesting, but I only
> seemed to get output from the first 1-2 commands.
>
> The xconnect establishes with no problems, and it will stay up, it just
> seems to be dropping packets for some reason.
>
> Is anyone familiar with the causes of these types of issues and what else
> can be looked at/debugged and how to resolve it?
>
> Thanks,
> Tom
>
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