Network technologies and trends

Jan 25 2016   4:45AM GMT

What is OSPF Totally Stubby Area?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Cisco IOS
Default route
IOS commands

OSPF Totally Stubby Area basically filters out an information of a OSPF database purely based on the LSA types. An ABR  in a Totally Stubby Area  prevents LSA type 3, Type4 and Type 5  to be flooded in to a Totally Stub Area.  It replaces all these types of LSA with a default route. Basically the Totally Stubby Area carries out the concept of Stub area in addition to removing type 3 LSA.

OSPF Totally Stubby Area





From the above scenario the ABR R2 will simply strips of Type 5, Type3 and Type 4 LSA and just forward a default route to R3. In order to configure a Totally Stubby Area one need to use Cisco IOS command ” area x stub no-summary” on the ABR Router and Cisco IOS Command ” area x stub” under OSPF process in Totally Stubby routers, where X happens to be the Area number . Now you might be wondering why the IOS commands are different in an ABR and other routers which are part of Totally Stubby Area,  well the IOS command  no-summary tells the ABR not to inject TYPE 3 LSA which represent the Inter-Area routes. I upcoming post lets see how to configure Totally Stubby Area.

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