OSPF on Point-to-Point

In chapter 1, I have mentioned that in case you have a Point-to-Point network, then the concept of DR/BDR will not be applied because you only have 2 routers in the segment and it doesn’t matter which one to be the DR and which one will be the BDR.

I just want to show you in a LAB that in case we have a Point-to-Point network what would happen for the DR election.

You can see that I have R1 and R2 which are connected via their serial interfaces to each other. Let’s put IP addresses on their interfaces.

You see that once I have put an IP on the serial interface of R2, the interface went up. Let’s ping from R2 to R1 to see if we have reachability.

[mepr-show rules=”319″ unauth=”message”]

Ok, we have ping. Now I will enable OSPF on both routers.

Now I have OSPF neighborship between R1 and R2. Let’s see if there is any DR/BDR election on both routers:

Look at that ???? – R1 and R2 have a state of “ P-2-P” and Type “P2P”. There is nothing called DR/BDR because we are using a Point-to-Point technology which is PPP encapsulation. This is a great proof that on Point-to-Point links there is no more DR/BDR election.

Lastly, I would like to check the neighborship on R1 and R2:

You can see on both routers, when checking about the peer, it shows that the neighborship is fully formed and there is no DR and BDR.

That’s all about this LAB, we still have 1 more LAB and we are done with this chapter.



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