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1. 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. Rene – in my class I have to discuss OSPF over Frame Relay. Im having a hard time grasping this. Specifically - I have to discuss a single subnet for every PVC – or – a single subnet for all routers using point to point subinterfaces associated with each PVC. So my understanding is….

   “Single subnet for all routers” – uses Point to Multi-Point (point to point subinterfaces) –. It’s the Point to Mulit-Point Broadcast and Point to Multi-Point NON Broadcast that is throwing me. I understand Frame Relay is a NonBroadcast MultiAccess (NBMA)…. So what is Point to

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4. Hi Jason,

   When configuring frame-relay, we have two options:

   • point-to-multipoint
   • point-to-point

   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:

   • non-broadcast
   • broadcast
   • point to multipoint
   • point to multipoint non-broadcast
   • point-to-point

   One of the main differences between broadcast/non-broadcast and the point-to-mult

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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 com

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