From: Sami Salim (cisco_obsessed@yahoo.ca)
Date: Thu May 11 2006 - 14:47:47 ART
The issue is would I get the points of that question in the exam, if I left it disabled (I mean the physical F/R interface). I have tried it in my home lab; enable it once then disable it, it makes no difference.
Petr Lapukhov <petrsoft@gmail.com> wrote: 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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