From: Michael (mamiller2@comcast.net)
Date: Mon Apr 03 2006 - 03:27:53 GMT-3
Ok, what about changing OSPF network type to broadcast though for FR partial
mesh network architecture interfaces? Is this going to have an effect on
multicast IP?
OSPF network broadcast would give you a DR also.
-----Original Message-----
From: sheng li [mailto:slilxn@yahoo.com]
Sent: Monday, April 03, 2006 12:16 AM
To: Michael; catwater@aussiemail.com.au
Cc: ccielab@groupstudy.com
Subject: RE: OSPF - Hub & Spoke - Point-to-Multipoint
You need NBMA when lab instruction tells you NOT to
broadcast, or NOT to touch ospf network type, or to
elect DR (because P-M never has DR). I'd love to use
P-M whenever possible, however, P-M does introduce
some 32bit networks for those endpoints, maybe
something to worry about.
--- 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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