We have two PVCs, but there is only a single subnet, so this is a frame-relay point-to-multipoint network. Let’s take a look at a configuration so I can demonstrate it to you:Ībove you see a frame-relay hub and spoke network. As you will see in my demonstration, the “blue” network types have different next-hop behavior from the “red” network types. Point-to-multipoint, point-to-multipoint non-broadcast, and point-to-point are in red because they have one thing in common: We tell OSPF that we have a “bunch of point-to-point” links. This can be challenging with frame-relay because this is not always the case if you have a partial mesh or hub and spoke configuration. In other words…every router can reach any other router. They both require a DR/BDR election and basically, you are telling OSPF that you have a multi-access network. I made non-broadcast and broadcast blue because these two network types have something in common. In this short lesson, I want to show you the difference between the next-hop IP address and the OSPF network type that we use. This can be confusing when you try configuring OSPF on top of a frame-relay network. OSPF will use different IP addresses for the next hop depending on the network type that you use.
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