[cisco-nas] Lost Fragments

Wed Jun 18 19:50:51 EDT 2003

I don't know how much you want or what you need, so here is a chunk of the
debug.  We are running 12.2(12) on a 3640.  0/1:0 and 0/1:4 are in a
multilink bundle and are having problems.  6&7 are in another bundle and
they are fine.

Jun 18 18:46:01: Se0/1:0 MLP: O frag 805C0E5A size 74 direct
Jun 18 18:46:01: Se0/1:4 MLP: O frag 405C0E5B size 77 direct
Jun 18 18:46:01: Se0/1:4 MLP: I frag 806C920A size 40 direct
Jun 18 18:46:01: Se0/1:0 MLP: I frag 406C920B size 41 direct
Jun 18 18:46:01: Se0/1:7 MLP: I frag C005331B size 50 direct
Jun 18 18:46:01: Se0/1:0 MLP: O frag 805C0E5C size 70 direct
Jun 18 18:46:01: Se0/1:4 MLP: O frag 405C0E5D size 71 direct
Jun 18 18:46:01: Se0/1:4 MLP: I frag 806C920C size 40 direct
Jun 18 18:46:01: Se0/1:0 MLP: I frag 406C920D size 41 direct
Jun 18 18:46:01: Se0/1:6 MLP: O frag 800DB348 size 758 direct
Jun 18 18:46:01: Se0/1:7 MLP: O frag 400DB349 size 760 direct
Jun 18 18:46:01: Se0/1:6 MLP: O frag 800DB34A size 758 direct
Jun 18 18:46:01: Se0/1:0 MLP: O frag 805C0E5E size 74 direct
Jun 18 18:46:01: Se0/1:4 MLP: O frag 405C0E5F size 77 direct
Jun 18 18:46:01: Se0/1:4 MLP: I frag C06C920E size 70 direct
Jun 18 18:46:01: Se0/1:6 MLP: O frag 400DB34B size 760
Jun 18 18:46:01: Se0/1:7 MLP: O frag 800DB34C size 758
Jun 18 18:46:01: Se0/1:7 MLP: O frag 400DB34D size 760
Jun 18 18:46:01: Se0/1:0 MLP: O frag C05C0E60 size 70 direct
Jun 18 18:46:01: Se0/1:0 MLP: I frag C06C920F size 62 direct
Jun 18 18:46:02: Se0/1:4 MLP: O frag C05C0E61 size 70 direct
Jun 18 18:46:02: Se0/1:4 MLP: I frag C06C9210 size 50 direct
Jun 18 18:46:02: Se0/1:0 MLP: O frag 805C0E62 size 122 direct
Jun 18 18:46:02: Se0/1:4 MLP: O frag 405C0E63 size 123 direct
Jun 18 18:46:02: Se0/1:6 MLP: O frag 800DB34E size 758
Jun 18 18:46:02: Se0/1:6 MLP: O frag 400DB34F size 760
Jun 18 18:46:02: Se0/1:7 MLP: O frag 800DB350 size 758
Jun 18 18:46:02: Se0/1:7 MLP: O frag 400DB351 size 760
Jun 18 18:46:02: Se0/1:6 MLP: I frag C005331C size 50 direct
Jun 18 18:46:02: Se0/1:4 MLP: I frag 806C9212 size 48 direct
Jun 18 18:46:02: Se0/1:0 MLP: I frag C06C9211 size 62 direct
Jun 18 18:46:02: Se0/1:0 MLP: I frag 406C9213 size 49 direct
Jun 18 18:46:02: Se0/1:0 MLP: O frag C05C0E64 size 62 direct
Jun 18 18:46:02: Se0/1:4 MLP: O frag 805C0E65 size 102 direct
Jun 18 18:46:02: Se0/1:0 MLP: O frag 405C0E66 size 105 direct

----- Original Message -----
From: "Dennis Peng" <dpeng at cisco.com>
To: "Voralt" <peder at voralt.net>
Cc: <cisco-nas at puck.nether.net>
Sent: Wednesday, June 18, 2003 6:34 PM
Subject: Re: [cisco-nas] Lost Fragments

> 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
> >
> >
> > _______________________________________________
> > cisco-nas mailing list
> > cisco-nas at puck.nether.net
> > http://puck.nether.net/mailman/listinfo/cisco-nas
>
> --
> -------------------------------------------------------------------------
>       ||        ||                                 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
> -------------------------------------------------------------------------
>