[cisco-nas] Lost Fragments

[Dennis Peng]

What version are you running? Can you get "debug ppp multilink frag"
for one of the problem sessions? We recently added a knob to multilink
to allow you to tune our reassembly buffers (see CSCdv80109), however
we need to know how the fragments are being received in order to
determine if tuning will help and, if so, how to tune effectively.

Dennis

Voralt [peder at voralt.net] wrote:
> We have a PRI into a 3640 and are running 128k ISDN connections.  When I
> look at "show ppp multi", I see the following.  xxx has lots of lost
> fragments and discards and coincidentally, says their connection seems
> "slow".  yyy says it is running fine.  Another bit of information is that
> user xxx is on LEC A and all of the users on LEC A have lost fragments and
> discards and appear to be slow.  yyy is on LEC B and all of the users on LEC
> b have no problems and no errors.  We are using LEC C for the PRI.  If we
> drop all of the users and make them dial back in, it still follows all of
> the users from LEC A.  To me, it seems like an issue either inside LEC A's
> network, or between LEC A and LEC C, but I'm not sure exactly where.  We've
> contacted LEC C and they say "we see no errors on the PRI, have a nice day".
> Any ideas where this error might be originating?  I can't imagine that it is
> on the user end.
> 
> 
> Virtual-Access5, bundle name is xxx
>   Bundle up for 2d22h
>   Dialer interface is Serial0/1:23
>   16452 lost fragments, 53922 reordered, 0 unassigned
>   7296 discarded, 0 lost received, 25/255 load
>   0x45C2F0 received sequence, 0x385538 sent sequence
>   Member links: 2 (max not set, min not set)
>     Se0/1:4, since 2d22h, last rcvd seq 45C2EE
>     Se0/1:0, since 2d22h, last rcvd seq 45C2EF
> 
> Virtual-Access6, bundle name is yyy
>   Bundle up for 2w5d
>   Dialer interface is Serial0/1:23
>   0 lost fragments, 23 reordered, 0 unassigned
>   0 discarded, 0 lost received, 7/255 load
>   0x19352E received sequence, 0x166A7C sent sequence
>   Member links: 2 (max not set, min not set)
>     Se0/1:8, since 2w5d, last rcvd seq 19352C
>     Se0/1:9, since 2w5d, last rcvd seq 19352D
> 
> 
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-- 
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      ||        ||                                 Dennis Peng
      ||        ||        Cisco Systems, Inc.      Escalation Engineer
     ||||      ||||       170 West Tasman Drive    Phone: (408) 526-6143
 ..:||||||:..:||||||:..   San Jose, CA 95134       Fax:   (408) 232-2343
   Cisco Systems Inc.                              dpeng at cisco.com
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