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:
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