OSPF Broadcast Network Type over Frame-Relay

This topic is to discuss the following lesson:

Thanks René! This explanation was so clear!

Hi René…excellent job, thanks for your help!!!

Hey Rene. My understanding is that broadcast is the default network type for ethernet interfaces and nonbroadcast is the default for serial interfaces. In the lesson you stated that the ip ospf broadcast command is not necessary in this example, but wouldn’t it be required since you’re configuring it on a serial interface?

Hi Thomas,

I just fixed it, you are correct. Broadcast is the default for Ethernet and non-broadcast for serial interfaces. The only exception is when you create a point-to-point sub-interface for frame-relay, the default will be point-to-point.

Rene

Nice lesson.

Rene… If we do not mention the OSPF network type then by default what network type OSPF gonna pick? By default it would be Broadcast Multi access or P2P not multiaccess?

Hi Adil,

It depends on the interface type, on Ethernet interfaces OSPF will pick broadcast as default. On PPP serial interfaces it will select point-to-point.

Rene

A post was merged into an existing topic: OSPF LSA Types Explained

Hi,
Why don’t you remove frame relay since cisco also removed from their subject
Thanks

Hello Sims

Actually, Frame relay may not be an official topic in the curriculum, however, OSPF network types are. So in order to be able to describe the various network types that OSPF can be configured with, it’s necessary to use a technology that is non broadcast to show how to configure it.

I hope this has been helpful!

Laz

Hi,
is it possible without frame relay . so the labbing will be easy
Thanks

Hello Sims

In order to be able to employ the various types of OSPF networks, you need to employ technologies that are “non broadcast” “point to point”, and “point to multipoint”. Ethernet is a broadcast multiaccess technology and thus will not do for configuring OSPF with these features. The only technology that can be readily labbed up that can be used with these OSPF features is Frame Relay.

I hope this has been helpful!

Laz