OSPF LSA Type 5 Filtering on Cisco IOS

Hello Chandrasekhar

To start off, take a look at this post that should answer at least part of your question:

Remember that LSAs can only be filtered between areas, so both LSA3 and LSA5 filtering is applied at the ABR. The purpose of filtering these LSAs is specifically to reduce the amount of unnecessary routing information to be distributed into OSPF areas that don’t need it. The following post describes these scenarios:

Take a look at this info, and if you have any further questions, please feel free to respond and ask!

I hope this has been helpful!

Laz

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