From: Brian Stewart (brian@xxxxxxxxxxxxxxxx)
Date: Tue Jul 18 2000 - 19:37:15 GMT-3
EIGRP split horizon is enabled on ALL interfaces. The default on IGRP and
other protocols can vary based on the interface type.
>From the doc CD....
Split horizon controls the sending of IP Enhanced IGRP update and query
packets. When split horizon is enabled on an interface, these packets are
not sent for destinations for which this interface is the next hop. This
reduces the possibility of routing loops.
By default, split horizon is enabled on all interfaces.
Split horizon blocks route information from being advertised by a router out
of any interface from which that information originated. This behavior
usually optimizes communications among multiple routing devices,
particularly when links are broken. However, with nonbroadcast networks
(such as Frame Relay and SMDS), situations can arise for which this behavior
is less than ideal. For these situations, you may want to disable split
horizon.
Hope this clears up the issue.
Brian Stewart
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