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Re: OSPF cheat sheet posted 03/16/2007
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You might want to add what would be the next hope in all the scenarios but
point-to-point.
Thanks,
-JM


On 3/16/07, Bit Gossip <bit.gossip@xxxxxxxxx> wrote:
>
> Hi Group,
> I want to squeeze in one page all the most important factors to choose the
> OSPF network type so that I can stuff it into my long term memory......
> Any comment is welcome, especially on the compatibility between network
> types
> Thanks,
> Luca.
>
> Network Type BROADCAST
> Hello to 224.0.0.5
> Hello 10, Dead 40
> DR election: Yes
> Compatible: NON_BROADCAST fixing timers
> NextHop Change: no
> Generate Host Route: no
> Neighbor: not allowed
> best suited for: LAN
>
> Network Type NON_BROADCAST
> Hello to unicast neighbor address
> Hello 30, Dead 120
> DR election: Yes
> Compatible: BROADCAST fixing timers
> NextHop Change: no
> Generate Host Route: no
> Neighbor: necessary
> best suited for: NBMA fully meshed
>
> Network Type POINT_TO_MULTIPOINT
> Hello to 224.0.0.5 even if neighbor is configured
> Hello 30, Dead 120
> DR election: no
> Compatible: p2mp non-broadcast, p2p
> NextHop Change: Yes
> Generate Host Route: Yes
> Neighbor: not necessary but allowed to change the cost
> best suited for: NBMA partially meshed, hub and spoke
>
> Network Type POINT_TO_MULTIPOINT non-broadcast
> Hello to unicast neighbor address
> Hello 30, Dead 120
> DR election: no
> Compatible: p2mp, p2p
> NextHop Change: Yes
> Generate Host Route: Yes
> Neighbor: necessary
> best suited for: NBMA partially meshed, hub and spoke
>
> Network Type POINT_TO_POINT
> Hello to 224.0.0.5
> Hello 10, Dead 40
> DR election: no
> Compatible: p2mp fixing timers
> NextHop Change: n/a (only 2 router on the network)
> Generate Host Route: no
> Neighbor: not allowed
> best suited for: ppp, hdlc, p2p fr sub-if
>
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