From: Church, Chuck (cchurch@wamnetgov.com)
Date: Fri Feb 06 2004 - 00:10:27 GMT-3
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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