Re: OSPF filtering

Ivan,

I have NOT studied your topology or scenario, but will conditional neighbor
adjacency work for you?
Where as long as neighbor A is up your local router ONLY establishes an
adjacency with that neighbor and your local router ONLY establishes an
adjacency with Neighbor B when and if Neighbor A is down.

On Thu, Feb 11, 2010 at 9:46 AM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> Just remember to re-enable debug when your router reloads, as "debug
> ip routing" will not survive the reboot...
>
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> On Thu, Feb 11, 2010 at 17:26, Ivan Hrvatska <ivanzghr_at_gmail.com> wrote:
> > I have managed to solve my problem. I used EEM to do it.
> > Initially my two locations had to have new L2 link. so both my
> > locations would be in area 212 and have only one connection to area 0
> > and this problem wouldn't exist. Since I didn't get that link, whole
> > scenario seems bad if you don't know whole story. Never the less, I
> > used EEM on router that has backup link on it. EEM monitors debug ip
> > routing msgs defined in one ACL. When it get log msg like this:
> >
> > RT: delete route to 10.212.128.0/17 via 10.212.20.18
> >
> > it knows that OSPF link with area 0 is down and it brings up the
> > backup interface. When OSPF with area 0 recovers it gets something
> > like this:
> >
> > RT: add 10.212.128.0/17 via 10.212.20.18
> >
> > and another event applet shuts down the backup port.
> >
> > At the other location backup link is always UP. I also put some mail
> > notifications in event which tracks my backup FE interface, and that
> > is whole idea.
> > I tested couple of scenarios and it works fine.
> > Thanks for your assistance.
>
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