filtering default route in ospf

[sachin30720041]

Hello,

R1----R2---R3---------R4

<---Area 0---><--Area 1-->

OSPF is running on all the routers.

R2 is distributing the default route. 

router ospf 1

default-information originate always

The default route is getting distributed in Area 1 too. Now I want to filter out the default route at R3.

On R3:

ip prefix-list prefix1 deny 0.0.0.0/0
ip prefix-list prefix1 permit 0.0.0.0/0 le 32

router ospf 1
distribute-list prefix prefix1 out

Still, I see the default route on R4. How to filter out the default route on R3?

Thanks,

Sachin

[MHM Cisco World]

For distance vector protocols (RIP, IGRP, EIGRP), this command prevents routes selected by the access list from being advertised to a neighbor. OSPF is a link-state protocol and does not advertise routes to a neighbor but advertises a link-state database. The neighbor determines the routes from the information in the link-state database. Therefore, this command has no effect when used with OSPF.

[Harold Ritter]

Hi @sachin30720041 ,

This command is only useful if applied on the ASBR. It has no effect if applied to the ABR. If you want t make sure that the default route won't make it to area 1, you can make it a stubby (or not so stubby) area.

Regards,