From: Rick Burts (burts@xxxxxxxx)
Date: Sat Jan 08 2000 - 11:30:12 GMT-3
Interesting situation. If your normal environment is that the router
has only a default route, do I assume that you are not running OSPF
on your primary link ? In that case OSPF demand circuit may not be
the best alternative for you. Have you considered maintaining your
usual default route and defining a floating static default route
pointed at the dialing interface ?
The other alternative that occurs to me is kind of messy but might
accomplish what you want. Keep the OSPF demand circuit, and define
a distribute list assigned to the dialing interface which denies
everything except the default route. (This assumes that your
OSPF neighbor router is sending you a default route - which may
not be a good assumption.) You would need to assure that the normal
default route had a lower OSPF cost so it would be preferred to the
demand circuit. This way you have two alternatives, one higher cost
as a backup.
To come up with the best alternatives it would be really helpful to
know more about the environment of the router, especially what
interfaces and what kind of routing environment.
Rick
On Fri, 7 Jan 2000, Manjeet Chawla wrote:
> Good question !
>
> My normal connectivity to destination network is via default route to
> internet. So the destination network network, under normal circumstances is
> not in the routing table. When the internet connection went down, ISDN
> kicked in and OSPF sent all routes from all the branch router to the caller
> and provided continued connectivity. When internet came back up, these route
> needs to go away.
>
>
> Rick Burts wrote:
>
> > Why would you want to clear them ? They were installed because the
> > neighbor advertised that they could be reached. If that changes the
> > neighbor should send an LSA changing their state. If you want them
> > to become unavailable, go the the neighbor and make them unavailable,
> > the router will open the demand circuit and send an update. Why do
> > you want to get in and clear them ?
> >
> > Rick
> >
> > On Thu, 6 Jan 2000, Manjeet Chawla wrote:
> >
> > > I configured OSPF demand circuit and all worked fine and remote routes
> > > were installed into the routing table. Hours later those routes are
> > > still in the routing table. How do I clear those OSPF route from the
> > > routing table.
> > >
> > > I have tried following:
> > >
> > > Clear ip route *
> > > clear ip route <ip add>
> > > Shut down BRI
> > > Cannot shut down the Dialer 0 as it is the lead in the rotary group.
> > >
> > > Any ideas ?
> > >
> > > -Manjeet
> > >
> > >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:22:43 GMT-3