From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sat May 13 2006 - 02:04:41 ART
Hello Lim,
Since a NBMA do not support broadcast / Mutilcast you need to use a method
of sending broadcast. In OSPF the updates are send as Multicast as you know,
the good part of OSPF over others is that you can define how we are going to
send pkts (OSI Modularity), using the ip ospf network type you configure
your router to send the update in the specific type for example ip ospf
network non-broadcast, you will need to use the neighbor command.
If you have a real NBMA H&S then think of why would you need to set up a BDR
for that topology? I think that if you need that (using a H&S Topology) you
would need a form off Full mesh topology by the use of Tunnels but. Every
one must go to the H..
If in your generic NBMA you are using the broadcast parameter for the L3 to
L2 (Frame-relay map ip X.X.X.X XXX BROACAST) then the NBMA network would
support the transmission of broadcasts allowing you to use any other OSPF
network type (to make life simple in a real world, ip ospf network
point-to-multipoint)
Try to lab it using 3 Routers connected to a switch with the Ethernet
interface in the same vlan, change the interface type to ip ospf network
non-broadcast to see what happens (please remember the neighbor and the
priority) :D
Thanks
Victor.
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de lim es
Enviado el: Sabado, 13 de Mayo de 2006 12:21 a.m.
Para: ccielab@groupstudy.com
Asunto: does ospf NBMA's BDR need neighbor statements just like the DR
Hi Group,
in generic nbma, DR in ospf uses neighbor cmd to
specify its neighbors, should we do this on the BDR as
well? best practice?
Any insights on this?
TIA
Lim
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