From: Jim Brown (Jim.Brown@caselogic.com)
Date: Sat May 10 2003 - 19:02:44 GMT-3
The spokes shouldn't become neighbors unless you have a full mesh
between all three routers. The hub router will not forward a EIGRP
multicast packet by design.
It appears the behavior you are observing is correct. If each of the
spokes has the routes of the other spoke it is working splendidly.
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Saturday, May 10, 2003 1:39 PM
To: Group Study
Subject: Re: Eigrp over F/R
Hey Jim,
Thanks for your response and sorry for the lack of clarity.
I did disable eigrp split horizon although I didn't explicitly say
eigrp. I
figured that since I mentioned that each spoke could see the routes
originating from the other spoke it would be apparent. I also figured
that
since split horizon is diabled by default on frame relay physical
interfaces, it would clear that I was referrring to eigrp's split
horizon.
But, I probably should have been more explicit. Sorry about that.
But, now that this ambiguity is out of the way, do you have any
thoughts
about this neighbor issue? Jim
----- Original Message -----
From: "Jim Brown" <Jim.Brown@caselogic.com>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study"
<ccielab@groupstudy.com>
Sent: Saturday, May 10, 2003 2:23 PM
Subject: RE: Eigrp over F/R
You need to specifically disable split horizon for EIGRP. Just disabling
split horizon for the interface will not have any effect on EIGRP.
Cut from the Doc CD
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
ip_c/ipcprt2/1cdeigrp.htm#1001215
In interface configuration mode
Router(config-if)# no ip split-horizon eigrp [autonomous-system-number]
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Saturday, May 10, 2003 11:08 AM
To: Group Study
Subject: Eigrp over F/R
Hi all,
I've configured Eigrp over F/R physical interfaces on each router with
rtr3 as
the hub and rtr1 and rtr2 as the spokes. I noticed that whether or not
I had
f/r map statements on the spokes pointing at the other spoke, Eigrp
would only
establish neighbors between the hub and each spoke. One spoke would
never
become neighbors with the other spoke.
I turned off split-horizon on the hub so spoke 1 was able to see routes
from
spoke 2 and vice versa.
Why don't the spokes become neighbors to each other?
And, even though rtr 1 and rtr 2 were able to see routes originating
from
each other in this particular scenario, are there any circumstances
where the
lack of neighbor relationship between rtr 1 and rtr 2 would cause some
problems?
And, lastly, if the spokes will never become neighbors, is it always
safe to
not have a f/r map statement on the spokes pointing to the other
spoke(s)?
Thanks for your feedback. Jim
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