From: Packet Man (ccie2b@hotmail.com)
Date: Fri Feb 06 2004 - 00:36:44 GMT-3
Thanks Chuck, I'll try that.
>From: "Church, Chuck" <cchurch@wamnetgov.com>
>To: "Packet Man" <ccie2b@hotmail.com>,<turgon2004@hotmail.com>
>CC: <ccielab@groupstudy.com>
>Subject: RE: Eigrp
>Date: Thu, 5 Feb 2004 21:10:27 -0600
>
>I don't understand most of the parameters either, but if you do the command
>a couple times, you'll get an idea of the hello interval of your router.
>Watch it on an ethernet interface, and you'll see it get close to but never
>get up to 5 seconds. That kind of lets you know the interval is in fact 5
>seconds for LAN ints. Debugging the packets with the datetime timestamps
>will give you an idea of the interval of the neighboring router. Doing a
>little checking, EIGRP will in fact form neighborships even with different
>hello and hold timers. Of course if one router's hello time is more than
>the other's hold time, you'll see them flap constantly.
>
>Chuck Church
>CCIE #8776, MCNE, MCSE
>Wam!Net Government Services
>13665 Dulles Technology Dr. Ste 250
>Herndon, VA 20171
>Office: 703-480-2569
>Cell: 703-819-3495
>cchurch@wamnetgov.com
>PGP key:
>http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
>
> > -----Original Message-----
> > From: Packet Man [mailto:ccie2b@hotmail.com]
> > Sent: Thursday, February 05, 2004 3:34 PM
> > To: Church, Chuck; turgon2004@hotmail.com
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Eigrp
> >
> >
> > Hey Chuck,
> >
> > Thanks for letting me know about that undocumented show
> > command. How do
> > find stuff like that?
> >
> > I ran that show command, but quite honestly, I didn't really
> > understand how
> > to interpret the output. What does "parent" mean? And, more
> > generally how
> > can I use the output to help troubleshoot a neighbor flapping problem?
> >
> > Thanks again
> >
> >
> > >From: "Church, Chuck" <cchurch@wamnetgov.com>
> > >To: "Packet Man" <ccie2b@hotmail.com>,<turgon2004@hotmail.com>
> > >CC: <ccielab@groupstudy.com>
> > >Subject: RE: Eigrp
> > >Date: Thu, 5 Feb 2004 14:15:23 -0600
> > >
> > >Debugging EIGRP packets or hellos with service timestamps
> > debug datetime
> > >will show you the frequency they're coming in at. I'm not
> > sure if EIGRP
> > >requires exact parameters like OSPF does for neighbors to form
> > >relationships. Nothing here at work to try it on. 'sh ip
> > eigrp timers'
> > >(hidden) will give you an idea of your sending frequency. I
> > think it
> > >behaves more like RIP, where as long as the dead time isn't
> > exceeded, the
> > >neighbor stays a neighbor (no, I'm not saying that RIP has
> > neighbors either
> > >:) I'm just doing this from memory, so someone please
> > correct me if I'm
> > >wrong...
> > >
> > >Chuck Church
> > >CCIE #8776, MCNE, MCSE
> > >Wam!Net Government Services
> > >13665 Dulles Technology Dr. Ste 250
> > >Herndon, VA 20171
> > >Office: 703-480-2569
> > >Cell: 703-819-3495
> > >cchurch@wamnetgov.com
> > >PGP key:
> > >http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%4
> > 0wamnetgov.com
> > >
> > > > -----Original Message-----
> > > > From: Packet Man [mailto:ccie2b@hotmail.com]
> > > > Sent: Thursday, February 05, 2004 2:22 PM
> > > > To: Church, Chuck; turgon2004@hotmail.com
> > > > Cc: ccielab@groupstudy.com
> > > > Subject: RE: Eigrp
> > > >
> > > >
> > > > Hi Chuck,
> > > >
> > > > Thanks for getting back to me on this.
> > > >
> > > > Actually, this is a practice lab problem. The issue here is
> > > > to figure out
> > > > how the remote router was (mis) configured by finding and
> > using the
> > > > appropriate debugs - and then configuring the local router as
> > > > to match. So,
> > > > it's "known" that there's no cable, interface, hardware issue
> > > > here, although
> > > > in the real world those sort of things would be among the
> > > > first to check.
> > > >
> > > > The idea is to be able to overcome this type of potential
> > > > "nasty" in the
> > > > actual lab where you don't access to the backbone router -
> > > > only your router
> > > > which is connected to the backbone router. I'm doing
> > this with every
> > > > routing protocol as an exercise to get stronger with using
> > > > and interpreting
> > > > debugs.
> > > >
> > > > With other protocols, it seems easier to find mis-matched
> > > > parameters, but
> > > > I'm having a heck of time doing so with Eigrp. The output
> > > > from their debugs
> > > > is unintellible for the most part and appears to be very
> > > > poorly documented.
> > > >
> > > >
> > > >
> > > >
> > > > >From: "Church, Chuck" <cchurch@wamnetgov.com>
> > > > >To: "Packet Man" <ccie2b@hotmail.com>,<turgon2004@hotmail.com>
> > > > >CC: <ccielab@groupstudy.com>
> > > > >Subject: RE: Eigrp
> > > > >Date: Thu, 5 Feb 2004 12:47:18 -0600
> > > > >
> > > > >Is this a new installation, or has it been in place for a
> > > > while? If it's
> > > > >flapping and been in place for a while, I'd say it's more
> > > > likely packet
> > > > >loss due to something, rather than mis-configuration. A
> > > > failing circuit
> > > > >will usually cause hellos to be lost and up/down neighbor
> > > > messages to be
> > > > >logged. Check your DSUs for errors, assuming it's serial
> > > > ints. And check
> > > > >the serial ints for errors, queue drops, etc. A pegged CPU
> > > > on the router
> > > > >can also cause neighbors to drop.
> > > > >
> > > > >Chuck Church
> > > > >CCIE #8776, MCNE, MCSE
> > > > >Wam!Net Government Services
> > > > >13665 Dulles Technology Dr. Ste 250
> > > > >Herndon, VA 20171
> > > > >Office: 703-480-2569
> > > > >Cell: 703-819-3495
> > > > >cchurch@wamnetgov.com
> > > > >PGP key:
> > > > >http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%4
> > > > 0wamnetgov.com
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Packet Man [mailto:ccie2b@hotmail.com]
> > > > > > 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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