From: Tony Olzak (aolzak@xxxxxxxxxxxxxxxxxxx)
Date: Tue Oct 10 2000 - 18:27:54 GMT-3
I know about holddown timers. I just didn't know split horizon permanently
prevented a route from going out an interface it was learned on even after
the route is gone. The Bay was taken down (route no longer in existence),
then the network was added to the Cisco.
Tony
----- Original Message -----
From: "David Ankers" <d.ankers@chello.nl>
To: "Tony Olzak" <aolzak@buckeye-express.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, October 10, 2000 5:25 PM
Subject: Re: Split-Horizon
> Split horizon will always be in effect. A route will *never* be advertised
> out of an interface it was learnt on unless poison reverse is used and
then
> it''l be advertised as 16 hops (infinity) - bad news is better than no
> news...
>
> I *guess* you are getting mixed up with holdtime timers which are only in
> effect for 3 (?) times the update interval.. I think disabling
split-horizon
> solved the problem as the other router(s) you wanted to update to were on
the
> same interface as the first ? Maybe you're glad you got them mixed up now
:-)
>
> Regards,
>
> Dave.
>
>
>
> On Tuesday 10 October 2000 23:15, you wrote:
>
> > > Yesterday I moved routing of one subnet from a Bay Router over to an
RSM
> on
> > a Cisco 5505. I used a secondary IP address, since they have no VLANs
set
> > up yet, to provide connectivity for routing of both subnets
(192.168.25.0
> > and 192.168.24.0).
> >
> > Here's the question, how long does split horizon stay in effect for RIP
> > version 2? After I moved the 192.168.24.0 network over to the RSM, the
> > network was not being propagated to the rest of the routers on this
> > customer's network. The problem was that 192.168.24.0 was originally
being
> > advertised by the Bay (192.168.25.1). So the interface on the RSM would
not
> > advertise the network even after it was off the Bay because it had
> > originally received it from another source.
> >
> > Today, a full day later, the route still won't go out. So I disabled
> > split-horizon and now it works.
> >
> > Tony
>
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