Configuring OSPF NSSA (Not-So-Stubby-Area)

Let’s think that there is an area after area 1, and I want that area to receive the LSA type 5 external. If you do area 1 as a totally stub area, then type 5 (as well as type 3) will be blocked. What we can do is to make area 1 as a NSSA, then you will have LSA type 7...

Configuring OSPF Totally Stub Area

In this LAB, I want to configure area 1 to be a totally stub area. Remember, with totally stub area LSA type 3 and type 5 area blocked, so we will only see a default route on the routing table. Let’s do the work. We're Sorry, Full Content Access is for Members Only......

Configuring OSPF Stub Area

I have this LAB scenario. I have already configured OSPF on all routers and I have configured RIP between R3 and R4 and made the route import. R1 should now see the route of 192.168.34.0/24 as LSA Type 5 external route from OSPF and should also see the route of...

What are Stub Areas in OSPF?

In OSPF, you can make an area as stub if it is not the area 0 (backbone area). But why we need to make the area as stub and what are the different types of stub areas? Before I dig into this chapter, please be sure that you have a very good understanding of the LSA...

OSPF Virtual Link (discontinuous backbone area)

Another place where you could use an OSPF virtual link is when you have area 0 that is discontinuous. Let me show you this in a graph. You can see that area 0 is split and in between is area 1. In this case, we require to make virtual link in area 1. I have already...