From: Victor Cappuccio (vcappuccio@desca.com)
Date: Mon Nov 13 2006 - 21:22:49 ART
Hi Kal, this is very well explained in the Internetwork Experts CODs.
Frame-relay is NBMA as you stated, but you can add support to use
broadcast using the frame-relay map ip x.x.x.x DLCI broadcast if the SP
Equipment allows that off course.
Now the point-to-multipoint is used to low the number of frame-relay map
needed at the spokes because this network type would create a /32 of
every router in the frame-relay cloud
There is a ospf network type named ip ospf point-to-multipoint
nonbroadcast, that u use when you do not have broadcast capabilities in
the NBMA Cloud
(in this case you need to specify the neighbors because you are not
multicasting (broadcast) traffic out those interfaces)
http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_feature_
guide09186a0080087d4e.html#xtocid272779
Saludos,
Victor.-
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kal Han
Sent: Lunes, 13 de Noviembre de 2006 08:03 p.m.
To: Cisco certification; ccielab
Subject: ip ospf network point-to-multipoint
Hi
when I use the ip ospf network point-to-multipoint command,
on a point to multipoint serial interface ,
will the neighbors talk using multicast ospf messages or
do they unicast ?
How will the neighbor relationship come up ?
I understand this is NBMA but I didnt understand how it will
use the unicast messages.
Will it get the neighbor IP based on "frame-relay map ip"
command we configure ?
Its just confusing !
Thanks
Kal
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