Friday, June 6, 2008

How to configure Stub area in OSPF protocol?

The area feature is used in OSPF to divide a large network into small segments. Any changes in one area will not cause any problem in other areas, thus reducing routing table size and processor overhead also.

There are three main types of area:

  • Stub area

  • Totally stub area

  • Not-So-Stubby area (NSSA)

The main purpose of stub area is to block the flooding from AS external advertisements in OSPF and only OSPF injects a default router into a stub area. In this tip we will discuss here only about stub area and the remaining areas will be discussed in the next tips.

Follow the network topology of three different routers in given figure:

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