From: Landon Fitts (l.fitts@xxxxxxxxxxxxxx)
Date: Sat Aug 17 2002 - 22:00:54 GMT-3
I set up a lab scenarios a few says ago with 3 routers in a hub and spoke
topology over FR.
I was able to get neighbors established between the hub router and both
spokes without using
neighbor statements or the "ip ospf network " command. The only commands
that I used were
frame relay map statements at both spokes with the "broadcast" keyword, and
I set the
"ip ospf priority 0" at both spokes to force the hub router to be the DR.
Everything worked
fine. Up until this lab scenario that I tried, I had always used neighbor
statements or
"ip ospf network" to get ospf neighbors established over a FR NBMA network.
All three routers were running 12.1(12) ios.
Is this normal?
Landon
----- Original Message -----
From: "ccie candidate" <ccie1@lycos.com>
To: <ccielab@groupstudy.com>; "Claudine DEMAR" <lkcnet00@hotmail.com>
Sent: Saturday, August 17, 2002 12:17 PM
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 with BGP when run over broadcast or non-broadcast network ...but not
sure about ospf .
>
> the second part of you question is not clear ..you said what is the
solution for 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 either 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 chapter 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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