OSPF ABR Type 3 LSA Filtering on Cisco IOS

Hello Abdulrahman

The filter-list command used to filter LSAs only takes prefix lists as the matching criteria for filtering. Take a look at this context-sensitive help from a Cisco IOS device:

Router(config-router)#area 3 filter-list ?
  prefix  Filter prefixes between OSPF areas

Router(config-router)#area 3 filter-list prefix ?
  WORD  Name of an IP prefix-list

I’ve also tried to lab this up and use an access list, but it doesn’t work. If you want to find out more about prefix lists, take a look at this lesson:

I hope this has been helpful!

Laz