OSPF Point-to-Multipoint Non-Broadcast Network Type over Frame-Relay

Hi Lee,

I don’t have a rhyme but there’s some logic to these OSPF network types:

Only broadcast and non-broadcast require a DR/BDR election since OSPF sees these network types as “multi-access”. Everything with “point” in it is seen as a collection of point-to-point links so there is no DR/BDR election.

Everything with “non-broadcast” requires you to configure neighbors since OSPF won’t be able to find them by itself.

Only with point-to-point we use a subnet for each PVC, all other OSPF network types usually have a single IP subnet.

Still some memorization to do but if you understand the logic, it will be easier to remember :slight_smile:

Configuring DLCIs doesn’t have anything to do with OSPF or its network types but when you configure frame-relay, you always need DLCIs…maybe you get one from the frame-relay switch or you have to do it yourself.

Rene

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