From: Joe Chang (changjoe@earthlink.net)
Date: Wed Jun 23 2004 - 11:12:05 GMT-3
I don't think SH can interfere with DUAL. If a downstream neighbor has an
alternate route the querier can use, the route cannot have come from the
querier.
----- Original Message -----
From: "Devi Mallampalli" <Devi.Mallampalli@chubb.com.au>
To: <ccielab@groupstudy.com>
Sent: Wednesday, June 23, 2004 2:39 AM
Subject: Eigrp - SP
> Hi Group,
>
> My understanding is S/Horizon is typically a Layer 2 aware concept which
> works in a NBMA N/Ws to avoid possible loops and is quite independent of
> Layer 3 functionality. Accordingly I was impression that SH is only
> enabled by default on Sub interfaces and that is why in a typical HUB &
> SPOKE topology, we need to disable SH so that one spoke can speak to
> another. But on Physical ints , there is no issue because by default SH
> is NOT enabled.
> But recently I heard that Split horizon is ONLY disabled for RIP and
> IGRP on a physical Frame Relay interface. EIGRP split horizon is ALWAYS
> on by default.
> Why so ? I was wondering among DV protocols of RIP, IGRP & EIGRP ( kind
> of hybrid , but I tend to go with DV any way for this argument sake),
> why only EIGRP needs SH to enable on both Physical & sub ints ? Is it
> any way DUAL requires SH to behave like that ?
> I appreciate any help in tighten my conceptual understanding.
> Devi.
>
>
>
>
>
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