From: Venkatesh Palani (kvpalani@gmail.com)
Date: Mon Apr 03 2006 - 03:00:03 GMT-3
Hi Michael,
I am not sure if this answers your questions..
in your frame relay map on R3 and R1 have maps only for r2 not for the
others by this you wont establish neigh between R1 and R3. also NBMA can
be used when you dont want to use multicast and wanted to use unciast. you
use neighbor command under NBMA mode and also it uses UNICAST not multicast.
HTH,
venkatesh
On 4/3/06, Michael <mamiller2@comcast.net> wrote:
>
> Ok, but doesn't Cisco documentation say differently? I'm really confused
> about this for some reason I don't understand yet. I do understand about
> TTL = 1. So with any configuration then R1 and R3 will never be neighbors
> in OSPF? Only neighbors are spoke(s) & hub then?
>
> The optional OSPF interface settings only allow DR election & timer
> settings?
>
> So when would you logically use Cisco default NBMA OSPF interface rather
> than P-M?
>
>
> -----Original Message-----
> From: Charlie Atwater [mailto:catwater@AUSSIEMAIL.COM.AU]
> Sent: Sunday, April 02, 2006 11:15 PM
> To: mamiller2@comcast.net
> Cc: ccielab@groupstudy.com
> Subject: Re: OSPF - Hub & Spoke - Point-to-Multipoint
>
> Michael I believe this is because R1 and R2 are neighbors as are R2 and
> R3.
> But R1 and R3 are not actually neighbors.
>
> CAT
>
> --- mamiller2@comcast.net wrote:
>
> From: "Michael" <mamiller2@comcast.net>
> To: "ccielab" <ccielab@groupstudy.com>
> Subject: OSPF - Hub & Spoke - Point-to-Multipoint
> Date: Sun, 2 Apr 2006 21:43:09 -0600
>
> Hi All,
>
>
>
> I am trying to understand some information about FR Point-to-Multipoint
> network interfaces in a Hub and Spoke architecture. I think I just
> figured
> it out but I still would like to hear comments.
>
>
>
> R1 (Spoke) <-> R2 (Hub) <-> R3 (Spoke)
>
>
>
> All three routers are physically connected to a IOS router and configured
> using routed PVC's. Is it because of the routed pvc's that I do not see
> "IP
> OSPF Neighbors" of R3 in R1?
>
>
>
> I am using physical (multipoint) interfaces with frame maps.
>
>
>
> Is it true that switched pvc's in my IOS router would react differently?
>
>
>
> Thanks,
>
> Michael
>
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