OSPF ABR Type3 LSA Filtering

■Task

Get the same output with below.

You can only config one command in OSPF configuration mode.

You aren’t restricted in other configuration mode.

■Topology

■Pre-Config

RT1

RT2

■Answer

RT2:
conf t
!
ip prefix-list AAA permit 1.1.1.1/32
!
router ospf 100
area 0 filter-list prefix AAA in
!
end

■Verify

■Note

If you use “filter-list in” on RT2, you can get the requested output.

LSA Type 3 can be controlled as following by using “area x filter-list prefix x [in] [out]” on ABR.

in : Restrict LSA type 3 that receives from other area.

out : Restrict LSA type 3 that advertise to other area.

You can only config one command in OSPF configuration mode in this task.

Therefore, you can get the requested output if you permit received LSA type 3(1.1.1.1/32) in area 0.

■Reference

Configuration Guide : OSPF ABR Type 3 LSA Filtering

Command Reference : area filter-list

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