From: Andrew Lissitz (alissitz@expand.com)
Date: Wed Jun 30 2004 - 00:59:25 GMT-3
Hello Folk,
Thanks for the many replies I got. I added the frame maps as discussed
below from Joe to each of the remotes, and the connectivity problems are
resolved. Now when the routing table presents the next hop address as the
far remote, routing works since the next hop is reachable - even though it
goes through the core router to get there.
I thought I had done this mapping to both sides at the same time - the local
router for the send, and the remote router for the reply. I looked on my
session log and I had only done it to one side at a time.... Me =
knucklehead...
Scott - thanks for your response as well. I have disabled inverse arp for
all the interfaces... I even went back and checked my FR switch a couple of
times...
However I am left with some questions about partial meshed networks.
In a partial mesh network, is it common to get next hop routes to remotes
for which you have no PVC to? It appears to be in my lab. Is it true to
say that all remotes will need mappings to all other remotes even though
they need to go through the core router? Again, this appears to be true in
my lab.
When using the physical interface, is it possible to tell each router that
the network is not fully meshed when it is or even when it is partially
meshed? I would have rather seen the next hop for any route be the core and
not listed as the remote router for the remote network.
Chad would you still like to see the configs? I am sure you would have
found what Joe mentioned had I posted these originally... I was trying to
keep my posting simple :-)
Thanks wonderful people
Andrew Lissitz
-----Original Message-----
From: Joe Chang [mailto:changjoe@earthlink.net]
Sent: Tuesday, June 29, 2004 11:15 PM
To: Andrew Lissitz; ccielab@groupstudy.com
Subject: Re: Frame Relay and OSPF - Next Hop Confusion
The hub should have a IP to DLCI mapping for each of its spokes. Each spoke
should map other spoke IPs to the hub DLCI. That should be enough for you to
ping from spoke to spoke (IIRC).
>
> It seems that the remotes think that each other are directly connected.
> When I send a ping from a remote I saw that the core router would send
> an ICMP redirects informing the remote router to connect directly. It
> seems that the routers think they are fully meshed when in fact they are
not.
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