From: Tony Olzak (aolzak@xxxxxxxxxxxxxxxxxxx)
Date: Mon Sep 25 2000 - 18:17:55 GMT-3
Mark,
When I use the command "ip ospf network point-to-multipoint" on all
interfaces in the frame cloud, I find that all routers may ping each other.
When you go into the routing table, there will be a route to each neighbor
and you won't need a specific map to reach other spokes.
Tony
----- Original Message -----
From: "Mark Lewis" <markl11@hotmail.com>
To: <aolzak@buckeye-express.com>; <ccielab@groupstudy.com>
Sent: Monday, September 25, 2000 3:29 PM
Subject: Re: Frame-relay multipoint
> Hi,
>
> Well, there are a couple of ways to do it.
>
> The problem on partially meshed fr network (eg.hub & spoke) is that the
> default mechanism for mapping layer 3 addresses to layer 2 (dlcis) is only
> good for point to point reachability (one end of pvc to other). I'm
talking
> about inv-arp of course.
>
> So, solutions:
>
> 1.frame-relay maps (trad.solution). In, for example, a hub and spoke
> scenario you would need maps from the spoke sites to the other spoke sites
> (assuming a hub with a multipoint int.). The hub router doesn't need maps
> because it's directly connected to the spoke sites.
>
> 2.make all the int.s point-to-point (even at the hub).Different subnets on
> each point-to-point, of course.
>
> 3.route-maps. Force packets out of int. even if no map (either static or
> dynamic)exists to the next-hop.
>
>
> By the way,you still need this even if you are using OSPF. Try setting it
up
> with a hub & two spokes. You'll find that even though you get all the
routes
> (assuming otherwise good set up), you won't be able to ping all
> destinations. Why not? Reachability to next hop (do the ping with debug ip
> packet & watch for 'encapsulation failed' messages (indicates lack of
map)).
>
> Hope this helps,
>
> Mark
>
>
>
> >From: "Tony Olzak" <aolzak@buckeye-express.com>
> >Reply-To: "Tony Olzak" <aolzak@buckeye-express.com>
> >To: <ccielab@groupstudy.com>
> >Subject: Frame-relay multipoint
> >Date: Mon, 25 Sep 2000 14:49:51 -0400
> >
> >Guys,
> >
> >Without running a routing protocol like OSPF, how do you get two routers
to
> >ping each other over the frame cloud when they do not have a direct PVC
to
> >each other. For example, R1 has a pvc to R2 and one to R3. They are all
on
> >the same network but R2 has to go through R1 to ping R3. How can you
> >accomplish this before a routing protocol is used? I'm guessing using
> >policy-basd routing with a route map that sets the next hop?
> >
> >Also, how can you enable a router to ping itself on a frame connection?
> >
> >Thanks,
> >
> >Tony
> >
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