From: Petr Lapukhov (petrsoft@gmail.com)
Date: Thu May 11 2006 - 10:53:23 ART
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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