From: Stephen Oliver (stevie_oliver@xxxxxxxxxxx)
Date: Tue Dec 11 2001 - 15:32:21 GMT-3
I know of that gotcha Peter and have used the no peer neighbor-route
command. My link is not flapping. It is coming up once, exchanging routes
then at the end of the idle timer going down and removing the routes at one
end.
Stevie.
>From: Peter Whittle <peter@whittle-systems.demon.co.uk>
>To: Stephen Oliver <stevie_oliver@hotmail.com>
>Subject: Re: Demand circuit.
>Date: Mon, 10 Dec 2001 23:54:47 +0000
>
>Stevie,
>
>Try looking at your PPP config, if you leave it as default then when the
>ppp comes up it will insert a /32 route into the routing table. When the
>link drops it will remove the /32 route. You can see this if you issue a
>'debug ppp neg' and watch the ppp negotiations, you will see the /32
>route inserted and removed.
>
>The consequence of this is that although the OSPF demand circuit sets
>'Do not age' on existing routes, which is working correctly it is seeing
>the routing table change because of the injected ppp /32 route and hence
>wants to send the delta to the other end. This in turn causes the link
>to come up again and then hence you potentially get flapping.
>
>Set 'no peer neighbor-route' on both ends to stop this behaviour.
>
>Peter
>
>
>In message <F159S8oLhWTjvuDocXp0000d6bc@hotmail.com>, Stephen Oliver
><stevie_oliver@hotmail.com> writes
> >I've been playing around with OSPF demand circuits. I configured it on
>two
> >physical bri interfaces and it works ok. When I move to a dialer
>interface
> >the link comes up and routes are exchanged. However once the idle
>timeout
> >expires the dialer interface is seen as down and the routes are deleted
>on
> >one end, the end without the ip ospf demand-circuit
> >command. If the link is brought up again both routers exchange routes
>then
> >the same happens when the idle timer expires. One router keeps and does
>don
> >age its routes but the other deletes them.
> >
> >Is this normal behaviour ?
> >
> >Stevie.
> >
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