OSPF Received routes - Do not advertise

[mtmharison]

Hello,

How to prevent a router from redistributing the route that it received from a router to another one?

Thanks,

Harison

[paul driver]

Hello
Redistribution does not occur automatically, if you have a router with dual routing processes (eg:OSPF/EIGRP)  and if it receives a prefix from one routing process it is not automatically advertised into the other.

Can you elaborate on this a little on your existing topology?
What redistribution are you performing (dynamic/static) and to/from what routing processes?
Are you using a single ospf area or multiple.

Are these routers directly connected?

Maybe post a topology diagram if applicable?

[Richard Burts]

Harison

I agree with @paul driver that we do not have a good understanding of your environment and what you are trying to achieve. Can you provide additional information to help clarify the issue?

Your post does talk about redistributing routes. If it is really about redistributed routes then it is possible to configure and use a route map that could control which routes are redistributed.

But the title of the post suggests that it is just learned OSPF routes that you do not want to advertise to a neighbor. In that case we need a better understanding of your environment.

If the learned routes are external routes which the router is learning in area 0 then configuring the neighbor to be in a different area which is stubby, then the external routes would not be advertised to that neighbor.

[MHM Cisco World · Accepted solution]

ospf is link state protocol meaning all router within same area have same DB, but you can divide this area into multi area this give you ABR which can filter route between Areas this way route receive from one area not forward to other area.