ip split-horizon eigrp
ip split-horizon eigrp as-number
no ip split-horizon eigrp as-number
Autonomous system number.
The behavior of this command is enabled by default.
To enable Enhanced IGRP (EIGRP) split horizon, use the ip split-horizon eigrp command in interface configuration mode. To disable split horizon, use the no form
For networks that include links over X.25 packet-switched networks (PSNs), you can use the neighbor router configuration command to defeat the split horizon feature. As an alternative, you can explicitly specify the no ip split-horizon eigrp command in your configuration. However, if you do so, you must similarly disable split horizon for all routers and access servers in any relevant multicast groups on that network.
Note: In general, we recommend that you not change the default state of split horizon unless you are certain that your application requires the change in order to properly advertise routes. Remember that if split horizon is disabled on a serial interface and that interface is attached to a packet-switched network, you must disable split horizon for all routers and access servers in any relevant multicast groups on that network.
The following example disables split horizon on a serial link connected to an X.25 network:
interface serial 0
no ip split-horizon eigrp 101
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