From: Larry Roberts (larryr@xxxxxxxxxxxx)
Date: Sun Jul 28 2002 - 16:31:18 GMT-3
Group,
Here is the breakdown on split-horizon on Frame Relay:
Split-horizon is DISABLED by default for RIP/IGRP on physical interfaces and
point-to-multipoint subinterfaces.
Split-horizon is always ENABLED on point-to-point subinterfaces.
Split-horizon is NEVER DISABLED by default for EIGRP on any type of Frame
Relay interface. You must explicitly disable it with the no ip split-horizon
eigrp <AS #> command. This rule also applies to IPX EIGRP.
HTH,
Larry Roberts
CCIE #7886 (R&S / Security)
----- Original Message -----
From: "Przemyslaw Karwasiecki" <karwas@ifxcorp.com>
To: "Prakash H Somani" <pdsccie@rediffmail.com>
Cc: "steven owen" <trueccie@yahoo.com>; <ccielab@groupstudy.com>
Sent: Sunday, July 28, 2002 8:58 AM
Subject: Re: about ip split-horizon on ospf/rip p-to-p network
> Which is consistent with IOS reference manuals:
>
> "If the interface configuration includes either the encapsulation
> frame-relay or encapsulation smds command, then the default is
> for split horizon to be disabled."
>
> After all, one cannot use "encapsulation" command on ptp or mtp
> subintefaces, that's why in such cases split horizon is ENABLED,
> as mentioned by Caslow.
>
> BTW -
> I am trying to learn as much as I can WITH IOS documentation,
> which any of us will have access to during lab. That is why
> I try to find references to all common problems on UniverCD,
> so maybe they will stick in my mind, and I will find them
> useful on the lab date.
>
> Przemek
>
>
>
>
> On Sun, 2002-07-28 at 09:32, Prakash H Somani wrote:
> > Friends correct me If I am wroing...
> >
> > For Frame-Relay -- Split-Horizn is Disabled only on physical
> > interface....it is by default enabled on PTP and PTM
> > interface...(CASLAW SAYS THIS)
> >
> > Regards...Prakash
> >
> > On Sun, 28 Jul 2002 steven owen wrote :
> > >on p-to-p fr lines ,which runs rip ,i think i should
> > >enable ip split-horizon (which is disable default),or
> > >route loop may appear .but if runs ospf,it seems
> > >unnecessary.
> > >so is "ip split-horizon "necessary only on rip&igrp
> > >routing network?
> > >
> > >Thanks
> > >
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