troubleshooting Question

OSPF IP Prefix-List

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jskfanFlag for Cyprus asked on
RoutersSwitches / HubsNetworking ProtocolsNetwork Operations
5 Comments1 Solution502 ViewsLast Modified:

R4 has Loopback 0 in area 0
other physical interfaces as shown in the topology they are in area 1,2,3

I have configured on R4:
R4#sh run | beg ip prefix
ip prefix-list INTO-AREA3 seq 5 deny
ip prefix-list INTO-AREA3 seq 10 permit le 32
ip prefix-list INTO-AREA3 seq 15 deny
ip prefix-list INTO-AREA3 seq 20 deny

router ospf 1
 area 3 filter-list prefix INTO-AREA3 in

when I go to R3 I see the routes below still there when they should be filtered out:

I have changed the sequence number of this command to sequence 25:
ip prefix-list INTO-AREA3 seq 25 permit le 32

and now I see the filtering worked. When I go to R3 which is in area 3. I do not see the routes:

Any Expert to explain the logic that the route has used in regard to the  ip prefix-list sequences. ?

Thank you
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