From: ccie candidate (ccie1@xxxxxxxxx)
Date: Sun Aug 18 2002 - 01:45:39 GMT-3
i dont think this is normal .
a few weeks ago there were a post about the same situation ,where the "broadcas
t" keyword don't remedy the neighbor command .
OSPF will not try to send the hellos as long as he think that the network is NB
MA ,once you define the neighbor , the router only then make use of the broadca
st keyword to send the multicast hellos.
HTH
--On Sat, 17 Aug 2002 21:00:54 Landon Fitts wrote: >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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