We help IT Professionals succeed at work.
Get Started

OSPF IP Prefix-List

Last Modified: 2017-10-30

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
Watch Question
Distinguished Expert 2018
This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE