This is NOT the sort of thing that belongs on an IETF mailing list, because it's vendor specific. That being said, it's relevant here.
> >Date: Tue, 24 Jun 2003 18:15:59 -0700 >Reply-To: Mailing List >Sender: Mailing List >From: Sina Mirtorabi >Subject: Re: Clarification on Cisco OSPF network types >To: [EMAIL PROTECTED] > > >Paresh, > >->Hi all, >-> >->Appreciate if someone could clarify how the various Cisco >->OSPF modes for NBMA networks work. >-> >->The command "ip ospf network {broadcast | non-broadcast | >->{point-to-multipoint [non-broadcast] | point-to-point}}" >->allows you to set an OSPF network mode. >-> >->I would like to know: >->1. How OSPF packets are transmitted on each of these modes - >->unicast, multicast etc ? > > >network \packet type |type 1 | type 2| type 3| type 4| type 5 >---------------------|-------|-------|-------|-------|------ >p2p | M | M | M | M | M >---------------------|-------|-------|-------|-------|------ >p2mp non-broadcast | U | U | U | U | U >---------------------|-------|-------|-------|-------|------ >p2mp broadcast | M | U | U | U | U >---------------------|-------|-------|-------|-------|------ >NBMA | U | U | U | U | U >---------------------|-------|-------|-------|-------|------ >Broadcast | M | U | U |M /MD *| M/MD * > > >U : unicast ( neighbor IP address ) >M : Multicast AllSPFRouters (224.0.0.5) >MD : Multicast AllDRouters ( 224.0.0.4 ) > >* For broadcast network, if Interface FSM is DR /BDR type 4 & 5 are sent >to M ( 224.0.0.5) otherwise it is sent to MD ( 224.0.0.6 ) > > >->2. How are neighbors discovered ? > >When the packet ( actually Hello ) is sent to unicast IP address a >manual configuration is required (except for VL which is found >dynamically once there is an intra-area path to the other end-point ) > >If Hello is sent to Multicast AllSPFRouters address and the link layer >has the broadcast capability ( or packet can be replicated to sent to >different VC ) then the neighbor discovery is dynamic > >Sina Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71371&t=71371 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]