From: Packet Man (ccie2b@hotmail.com)
Date: Thu Feb 05 2004 - 21:07:09 GMT-3
Hey Scott,
As it turns out, there's more than 1 way to cause a flapping eigrp nieghbor
problem. I initially thought it had to be because the Hello or Holdtime
parameters were mis-matched. But, now I know that if Eigrp is running over
a F/R or ATM network and the broadcast keyword is left out, this too will
cause the neighbor to flap.
All I can say is that this has been a vary good afternoon. I learned a
bunch of new things I can do to troubleshoot a Eigrp problem and I learned
of new ways things can go wrong with Eigrp. Hopefully, this knowledge hangs
around long enough to help me pass the lab.
Thanks
>From: "Scott Morris" <swm@emanon.com>
>To: "'Packet Man'" <ccie2b@hotmail.com>,<turgon2004@hotmail.com>
>CC: <ccielab@groupstudy.com>
>Subject: RE: Eigrp
>Date: Thu, 5 Feb 2004 13:58:32 -0500
>
>Timers are not a "negotiated" issue here. But you should be able to tell
>from the debugs how often you are receiving Hello's from the other side,
>which may assist you in making this determination.
>
>The hold interval, you may be able to look at from the thinking of how
>often
>your neighbor goes away and comes back, but that's more work. :)
>
>Beat whoever played with the timers and didn't tell you if this is the
>case!
>Beat them soundly. :)
>
>Is there anything else going on though? Just over a directly connected
>interface? Normal serial line? Ethernet? What else? There may be L2/L1
>issues occurring as well to look into depending on your interface.
>
>HTH,
>
>
>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
>JNCIS, et al.
>IPExpert CCIE Program Manager
>IPExpert Sr. Technical Instructor
>swm@emanon.com/smorris@ipexpert.net
>http://www.ipexpert.net
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Packet Man
>Sent: Thursday, February 05, 2004 1:40 PM
>To: turgon2004@hotmail.com
>Cc: ccielab@groupstudy.com
>Subject: RE: Eigrp
>
>Thanks for getting back to me.
>
>As it happens, I tried both of those debugs but the output was, for the
>most
>part, undecipherable and I couldn't tell from that output if there was a
>mis-match.
>
>Do you know what specifically I should look for in the output from those
>debugs to see if there's a Hello or Hold interval mismatch?
>
>Thanks iv advanced
>
>
> >From: "Gary Duncanson" <turgon2004@hotmail.com>
> >To: ccie2b@hotmail.com
> >CC: ccielab@groupstudy.com
> >Subject: RE: Eigrp
> >Date: Thu, 05 Feb 2004 18:34:49 +0000
> >
> >debug eigrp neighbor
> >debug eigrp packet
> >
> >
> >>From: "Packet Man" <ccie2b@hotmail.com>
> >>Reply-To: "Packet Man" <ccie2b@hotmail.com>
> >>To: ccielab@groupstudy.com
> >>Subject: Eigrp
> >>Date: Thu, 05 Feb 2004 12:50:24 -0500
> >>
> >>Hi all,
> >>
> >>I'm trying to debug a flapping Eigrp neighbor. I can access my local
> >>router's config but I can't access the remote router.
> >>
> >>I'm trying to figure out which debug to use to see if there's a
> >>mismatched hello or holdtime interval, but can't seem to find the right
>debug to use.
> >>
> >>Anybody have any ideas?
> >>
> >>Thanks in advanced.
> >>
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