From: ccie candidate (ccie1@xxxxxxxxx)
Date: Sat Aug 03 2002 - 19:28:20 GMT-3
that is a good question ..i have been thinking of the same question some time a
go ...here are my conclusions (that is only what i thought )
by definition , frame relay is NBMA network and if you kept it without change ,
ospf will not bother to send the broadcast (hellos) !!! simply because he cons
ider the network as NBMA and there is no place for the hellos here !:)
that is why you need to use the nieghbor command , this will inform the OSPF to
change the broadcast to unicat traffic directed to the neighbor , well now he
can send the hellos to certain guys on the NBMA network .
or simply change the network type (from OSPF point of view ) to let the router
start send the broadcast /multicast hellos , only at this point he will start c
onsider the broadcast keyword in your frame map .
i hope this help
--On Sat, 3 Aug 2002 20:03:39 Malcolm Price wrote: >Hi Group, > >This is probably a simple question which really I should know, but I was >wondering if someone could clarify the need for the following: > >When using OSPF over NBMA Frame Relay, given the following 4 router >multipoint scenario: > >interface serial0 >encapsulation frame-relay >ip address 172.16.2.1 255.255.255.0 >frame-relay map ip 172.16.2.4 200 broadcast >frame-relay map ip 172.16.2.5 200 broadcast >frame-relay map ip 172.16.2.6 200 broadcast >! >router ospf 100 >network 172.16.0.0 0.0.255.255 area 0 > > >As I understand, using the command "frame-relay map ip 172.16.2.4 200 >broadcast" would forward "broadcast" and multicast packets across the NBMA >network. > >Given this useage, why would we need to use the following command to forward >ospf multicasts/broadcasts: > >ip ospf network broadcast > >if the purpose of these commands is to broadcast forward ospf info..? > > >I understand what the ip ospf network commands represent and their function, >it's clarification of the broadcast option of the frame-relay map command I >was looking for?. > >Many thanks, >Malcolm > > > >Malcolm Price M.Phil. MBCS C.Eng. >Technical Director >LanBase Technologies >www.lanbase.com
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