[zebra 23024] Re: Selective route advertisement

> Hi,
> Is there any way to do selective route advertisement
> with Zebra ospfd?
> Basically, I want zebra ospf router not to advertise
> the routes it learned from
> a particual interface to another interface.

This violates fundamental design criteria of OSPF. Routes are not really
advertised to other routers in the same area so much as they are
synchronized, and that areas are fully synchronized is a primary design
attribute of OSPF.

For example, OSPF avoids routing loops because every router in an area knows
exactly what every other router in that area will do because their routes
for that area are synchronized. If you could suppress routes within an area,
routing loops could occur.

>Zebra router --------- interface 1 ------------ router1 - Network 1
>           |
>           --------- Interface 2 ----------- router2 - Network 2
>
>I dont want router to forward the network 1 route to router 2.

You are fundamentally misunderstanding what OSPF *is*. OSPF is a link state
protocol. It advertises the state of links. You are trying to get it to
advertise paths, and that's just not OSPF.

What you are asking for, if it were possible, would be a disaster. See this
web page:
http://blogs.sun.com/paulj/entry/why_can_t_i_filter

The short answer is: OSPF advertises links, not routes, so it cannot
advertise routes selectively.

DS