From: Petr Lapukhov (petrsoft@gmail.com)
Date: Thu May 11 2006 - 14:02:43 ART
I'm sorry guys, Chris Guzman correctly pointed my typo:
"ip split horizon is DISABLED by default on FR physical,
On every other inteface type is is ENABLED by default :)
"
Always been messing with that logic :) Especially when I type fast :)
2006/5/11, Petr Lapukhov <petrsoft@gmail.com>:
>
> The main things to remember with split horizon:
>
> 1) You should remember that physical FR interface has "ip split-horizon"
> enabled by default. Pay attention to this with RIP configurations.
>
> 2) EIGRP has different command for split horizon; it is on by default
> on every interface
>
> 3) You need to disable split-horizon if you want to advertise secondary IP
> back the same interface.
>
> 4) A way to work out H&S problem w/ split-horizon is update unicasting.
>
> 5) Split-horizon applies to redistributed routes. That is, if if you
> receive routes
> via one interface and try send them back the same interface,
> redistibuting into
> another protocol, you need to disable split horizon. Protocols need to
> be
> distance-vector, of course :)
>
> 6) Split-horizon is turned on for RIPng on every inteface by default. You
> can disable it
> only per-process.
>
> There are more things, but they are not that important :)
>
> HTH
> Petr
>
> 2006/5/11, Schulz, Dave <DSchulz@dpsciences.com>:
>
> > Sami -
> >
> > Take a look at the docCD on what split-horizon does, by disallowing
> > advertising what it receives on an interface to be sent out the same
> > interface. So if you are on hub and spoke, for example, and need to get
> >
> > the inform from a spoke to another spoke (received at the hub, set up as
> > multipoint)....you will need to disable it. HTH.
> >
> >
> > Dave Schulz,
> > Email: dschulz@dpsciences.com
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Sami Salim
> > Sent: Thursday, May 11, 2006 6:56 AM
> > To: CCIE Group Syudy
> > Subject: Split-horizon enable/disable
> >
> > Hi folks,
> > I am trying to understand the logic to enable/disable split-horizon on
> > distance-vector interfaces; like ethernet sub-interface, physical serial
> >
> > f/r, sub-interface serial f/r and lastly the hub&spoke physical and
> > sub-interface.
> >
> > Thank you
> >
> >
> >
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