RE: OSPF NBMA and policy routing

From: Noel.MacFadden@xxxxxxxxxxxx
Date: Sun Aug 18 2002 - 12:07:52 GMT-3

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  Hi;
     NBMA : DR Election
            Requires manual neighbor establishment (neighbor command)
            In partial mesh ensure HUB is DR (priority command)
            and you need to map spokes to hub, otherwise the spokes
            will not be able to communicate with each other.

     POINT_TO_MULTIPOINT : No DR Election,
                           automatic neighbor establishment
                           Provides automatic mapping via
                           routing table [host routes x.x.x.x/32]

     --> Dont mix up both types on a network, it will not work.

     and it works beautifully without even a mention of policy routing.

 Regards

        Noel

-----Original Message-----
From: ccie candidate [mailto:ccie1@lycos.com]
Sent: Samstag, 17. August 2002 18:18
To: ccielab@groupstudy.com; Claudine DEMAR
Subject: Re: OSPF NBMA and policy routing

Claudine ;
im not sure about the next hop thing , what im sure of is that this the case wi
th BGP when run over broadcast or non-broadcast network ...but not sure about o
spf .

the second part of you question is not clear ..you said what is the solution fo
r ospf over NBMA...you mean the problem to form adj.??

if so ..you have to use the neighbor command , OSPF when see NBMA network will
not try to send hello (even if you map with broadcast keyword ) unless you do e
ither of
1-define your neighbors (neighbor command )
or
2-change the network type from the ospf point of view
(ip ospf netw) command

i dont see what is your point of using policy routing here ??

the nicest reference about FR in my opinion is caslow book (probably the best c
hapter of the whole book ).

HTH

--
On Sat, 17 Aug 2002 16:10:19
 Claudine DEMAR wrote:
>Hello.
>
>Little Question regarding OSPF over NBMA networks:
>R1, R2, R3, R4 connected in a hub(R1)- spokes topology.
>R1 has a subint multipoint; R2, R3, R4 are configured on their physical
>serials.  All routers in area0. R1 is DR.
>
>Finally, the difference between using NBMA and POINT_TO_MULTIPOINT would be
>that in the first case(NBMA) the spokes will see the routes for the other
>router's networks with next-hop=remote router.
>
>In second case (PTMP), the spokes will see the routes for the other router's
>networks with nexthop=hub router.
>
>Is that correct ???
>
>Also solutions to OSPF over NBMA would be to use frame map ip statements or
>policy routing. Is that correct ?? Any other suggestions ?? Any reference
>books or papers on the subject ?
>
>Many thanks,
>
>Claudine
>
>
>

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