OSPF Point-to-Point Network Type over Frame-Relay

Hub(config)#interface serial 0/0 Hub(config-if)#encapsulation frame-relay Hub(config-if)#exit Hub(config)#interface serial 0/0.102 point-to-point Hub(config-subif)#ip address 192.168.12.1 255.255.255.0 Hub(config-subif)#frame-relay interface-dlci 102 Hub(config-subif)#exit Hub(config)#interface serial 0/0.103 point-to-point Hub(config-subif)#ip address 192.168.13.1 255.255.255.0 Hub(config-subif)#frame-relay interface-dlci 103

Spoke1(config)#interface serial 0/0 Spoke1(config-if)#encapsulation frame-relay Spoke1(config-if)#interface serial 0/0.201 point-to-point Spoke1(config-subif)#ip address 192.168.12.2 255.255.255.0 Spoke1(config-if)#frame-relay interface-dlci 201

Spoke2(config)#interface serial 0/0 Spoke2(config-if)#encapsulation frame-relay Spoke2(config-if)#interface serial 0/0.301 point-to-point Spoke2(config-subif)#ip address 192.168.13.3 255.255.255.0 Spoke2(config-if)#frame-relay interface-dlci 301

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Tags: Network Type, Point-to-Point

Forum Replies

system says:

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

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…
jmwalker24 says:

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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ReneMolenaar says:
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:
One of the main differences between broadcast/non-broadcast and the point-to-mult
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lagapides says:

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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