... m'tinks Ele'Chil' might be on to sumpin' here.... could you capture the
sho fr pvc / and sho fr map from both ends of the one NOT passing CDP
traffic... and post them?
.... yeah, this is of some interest to me too, but priscilla hit the issue
with the "broadcast" thread....
.... think of all the mechanisms passing the various protocol encaps here....
inarp - what's the LPort doing? What's the CIR/BW? Util? When you do
an extended ping with a bit pattern of 0x4040; 0xAAAA; & 0xFFFF with,
say 150 itterations, what happens?
R/
Rainman
ElephantChild wrote:
> On Wed, 12 Jul 2000, John Neiberger wrote:
>
> > The PVC is working perfectly, except for CDP. It's configured exactly like
> > the 89 other subinterfaces on that major interface, so I doubt it's a
> > configuration issue, but it still may be. The remote side has two PVCs on
> > one major interface and CDP is working on one subinterface only and they,
> > too, are configured exactly the same except for DLCI and IP address.
>
> Do you have problems with other broadcasts not making it on that (or any
> other) PVC? If you're not exceeding your CIR on that PVC (have you
> checked that?), my guess is that the broadcast queue on the
> (sub)interface gets full, or that some other queuing limit kicks in.
>
> > > Is it just CDP not working or is the whole PVC showing as inactive?
> > I've
> > > seen where if LMI was configured incorrectly at the remote end when the
> > > router was first brought up it would come up but after a minute or so go
> > > down because it wasn't receiving lmi keepalives from the switch. In this
> > > case it was a telco switch problem and I do know that LMI is supposed to
> > be
> > > autosensing with the newer software.
> > >
> > > If it is just CDP down I would have suggested something to do with the
> > > timers but you said the remote end isn't receiving any packets at all?
> > > Hmmm.
> > >
> > > -----Original Message-----
> > > From: John Neiberger [mailto:[EMAIL PROTECTED]]
> > > Subject: RE: CDP not working on subinterface
> > >
> > > We use entirely point-to-point subinterfaces, and we have no special
> > > configuration on them regarding broadcasts. On this particular major
> > > interface, there are 90 subinterfaces and CDP is working just fine on all
> > > but two of them. They all have identical configs except for the DLCIs
> > and
> > > IP addresses. "show cdp int" shows that CDP packets are being sent, but
> > > they aren't being received at the opposite end, according to "debug cdp
> > > packets".
> > >
> > > Another oddity about this is that it worked correctly when I first
> > brought
> > > the circuit up for about a minute or so, and then it stopped. Very
> > > strange...
> > >
> > > > This is purely a guess.......
> > > >
> > > > Are you allowing broadcasts across the PVC by using the broadcast
> > keyword
> > >
> > > > on the frame-relay map command? CDP sends to a multicast address.
> > > >
> > > > Priscilla
> > > >
> > > > At 08:50 PM 7/11/00, John Neiberger wrote:
> > > > >No, I haven't done that, but I did "show cdp int" and the router said
> > > that
> > > > >it was sending cdp packets out that interface. Both routers on each
> > end
> > > of
> > > > >the link reported this. I'll try debugging tomorrow.
> > > > >
> > > > >
> > > > > > Did you run "debug cdp" to verify that it is being sent?
> > > > > >
> > > > > > Magnus Thorne
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: John Neiberger [mailto:[EMAIL PROTECTED]]
> > > > > > Subject: CDP not working on subinterface
> > > > > >
> > > > > > We do not have CDP disabled anywhere on our routers, either
> > globally
> > > or
> > > > >at
> > > > > > the interface level. I brought up a new PVC today and at the
> > remote
> > > side
> > > > >I
> > > > > > could see both PVCs to that router. After a few seconds, though,
> > > one of
> > > > > > them disappeared from the "show cdp neighbors" output. No
> > changes
> > > were
> > > > >made
> > > > > > to configs at either side, it just did this on it's own. This
> > > particular
> > > > > > PVC is terminating at a subinterface on both routers, and other
> > > > > > subinterfaces on the major interfaces at each end still report
> > their
> > > cdp
> > > > > > neighbors correctly; the problem is only on this particular
> > > > >subinterface.
> > > > > >
> > > > > > I have noticed this in the past with a different PVC, so it's
> > > happened at
> > > > > > least twice in our network.
> > > > > >
> > > > > > any ideas why it works temporarily and then quits?
>
> --
> Bungee jumping and skydiving are for wimps. If you want to experience
> true gut-wrenching terror, have children. --Dusty Rhoades.
>
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