Configuring OSPF to Filter ABR Type3 LSA

Filtering LSAs in an area can prevent unnecessary LSA transmission. This reduces the size of the LSDB on the neighboring router and speeds up network convergence.

Context

After filtering conditions are set for the incoming or outgoing Type 3 LSAs (Summary LSAs) in an area, only the Type 3 LSAs that meet the filtering conditions can be received or advertised.

This function is applicable only to the ABR.

Procedure

Access the system view.
system-view
Access the OSPF process view.
ospf [ process-id ]
Access the OSPF area view.
area area-id
Configure the rule of filtering Type3 LSAs originated by the ABR.
filter { acl-number | ip-prefix ip-prefix-name | route-policy route-policy-name } { export | import }