[c-nsp] [nsp] Strange multilink ppp issue with T1s

[Rodney Dunn]

Surely sounds like a bug.

You could try a couple things to narrow it down.

a) disable fragmentation
b) setup an ACL to match on packets to and from router A and B
   'debug ip packet <acl> to determine for sure if we are
   dropping all the packets outbound
  /*Would help to do this test with traffic no routed over the
    bundle*/
  'clear counters' before and get:
  sh int for the bundle before and after.

Under this test if you send 10 does it show as 10 output drops?

c) If you narrow it down to being the drops are output on the
   bundle try shutting down one member of the bundle at the
   time and see if the pings start back.

I did a quick glance through the MLPPP bugs fixed since
12.2(8)T and there were a few pretty close I couldn't say
I saw one that was a slam dunk.


Rodney


 On Thu, Jul 29, 2004 at 01:38:39PM -0600, John Norton wrote:
> I'm using a 3725 with 2 t1s in multilink configuration.  Occasionally it
> will start dropping packets, as seen by the multilink interface, both
> t1s show clean, multilink 1 shows output drops increasing.  Reload the
> router and works again for a period of time.
> 
> Version 12.2(8)T5
> 
> John
> 
> -----Original Message-----
> From: Rodney Dunn [mailto:rodunn at cisco.com] 
> Sent: Thursday, July 29, 2004 1:29 PM
> To: Bill Wichers
> Cc: John Norton; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] [nsp] Strange multilink ppp issue with T1s
> 
> Can you ask the question again for me?
> 
> What platform?
> What code?
> What problem?
> 
> Thanks,
> Rodney
> 
> On Thu, Jul 29, 2004 at 01:56:18PM -0400, Bill Wichers wrote:
> > I'm assuming you are referring to my post from some time back.
> > Unfortunatly, no, I have not found any solutions to the problem and
> I've
> > tried just about everything I can find info on. This seems to be a big
> > stumper -- I didn't even get any responses here :-(
> > 
> > Our ultimate solution was to cheat and order a DS3 with has the added
> > advantage of being faster too... Since there is already fiber in the
> > building, and the other end is our facility in a CO, this was a
> reasonable
> > (although more expensive) option for us. I would still like info on
> the
> > MPP issue since we do have some POPs still fed this way, but for
> whatever
> > reason the problem doesn't seem to have as much effect on 2 T1 bundles
> as
> > bundles with 3 or more.
> > 
> >      -Bill
> > 
> > > Did you every find a solution to this problem?  I have a problem
> that is
> > > very very similar.  Thanks in advance.
> > >
> > >
> > >
> > > John
> > >
> > *****************************
> > Waveform Technology
> > UNIX Systems Administrator
> > 
> > 
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