From: lim es (tiga72@yahoo.com)
Date: Sat May 13 2006 - 02:30:19 ART
Hi Group,
Thanks to Victor and Brain for the inputs,
i forgot to mention that the scenario is in fact among
3 routers in a common ethernet segment.
the lab scenario specifies the use "ip ospf network
non-broadcast" on all 3 routers
the solution states to use neighbor statements as well
for the BDR.
i have just tried out in the lab......conclusion: the
neighbor statement is needed on the BDR as well in the
event DR goes down.
any comments
TIA
Lim
--- Victor Cappuccio <cvictor@protokolgroup.com>
wrote:
> 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
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam
> protection around
> http://mail.yahoo.com
>
>
This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:21 ART