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Forum Replies

  1. system says:

    Keep in mind that the physical interface for frame-relay is always non-broadcast.

  2. Hi Gabriel,

    OSPF network broadcast will work but it's normally used for frame-relay point-to-multipoint topologies like in this example. For frame-relay point-to-point it's best to use the point-to-point or point-to-multipoint network type.

    On the other hand, you can make all the OSPF network types work on any given topology...

  3. Hi Jason,

    When configuring frame-relay, we have two options:

    The links above will show you a configuration example for each. The main difference is that point-to-multipoint uses a single subnet for all PVCs while point-to-point uses a different subnet for each PVC.

    Now when it comes to OSPF, this can be confusing yes...here are all network types:

    One of the main differences between broadcast/non-broadcast and the point-to-multipoint network types is the next hop that we use, take a look here:

    OSPF network types IP next hop

    Frame-relay is NBMA but with the correct frame-relay maps, we can "emulate" broadcast traffic so that you can forward multicast/broadcast traffic on the PVCs.

    Rene

  4. Hi Ahmad,

    They all work so it doesn't matter too much which one you pick.

    The point-to-point or point-to-multipoint network types are probably the easiest to use. You don't require a DR/BDR election so you don't have to worry about setting the correct priority.

    Rene

  5. Hello Michael.

    I refer to yout @ReneMolenaar’s previous post where he states that [quote=“ReneMolenaar, post:24, topic:921”]
    They all work so it doesn’t matter too much which [network topology] you pick.

    The point-to-point or point-to-multipoint network types are probably the easiest to use. You don’t require a DR/BDR election so you don’t have to worry about setting the correct priority.
    [/quote]

    So it really doesn’t matter which network type you choose, as long as they are configured correctly.

    However, keep the following issues in mind:

    • If each area is composed of a point to point connection between routers, you do not require DR/BDRs at all.
    • Secondly if you are creating four areas and these areas connect to each other in a ring topology, then one of these areas will not be directly connected to area 0. You will require either a virtual link (which is not advisable as a permanent solution) or you will need to revise the topology.

    I hope this has been helpful!

    Laz

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