Chapter 9: AI2524 OSI/CLNP Configuration Steps
August 1997 Page 9-19
2524UM
zDisable split horizon for ISO IGRP updates.
no clns split-horizon
The default for all LAN interfaces is for split horizon to be enabled;
the default for WAN interfaces on X.25, Frame Rela y, o r SM DS net-
works is for split horizon to be disabled.
Configure IS-IS Dynamic Routing IS-IS is a dynamic routing specification described in ISO 10589.
Cisco's implementation of IS-IS allows you to configure IS-IS as an
ISO CLNS routing protocol.
To configure IS-IS, complete these tasks. Only enabling IS-IS is re
quired; the remainder of the t asks are optional, although you might b
required to perform them depending upon your specific application.
zEnable IS-IS
zAssign Multiple Area Addresses to IS-IS Areas
zConfigure IS-IS Parameters
zConfigure IS-IS Interface Parameters
In addition, you can also configure these miscellaneous features:
zFilter routing information (refer to Create Packet-Forwarding Fil-
ters and Establish Adjacencies)
zRedistribute routing information from one routing process to an-
other (refer to Redistribute Routing Information)
zConfigure administrative distances (refer to Specify Preferred
Routes)
Enable IS-IS
To configure IS-IS dynamic routing, you must en able the IS-IS routing
process, identify the address for the router, and specify the interfaces
that are to route IS-IS. CLNS routing is enabled by default when you
configure IS-IS dynamic routing. Y ou ca n s p ecify only one IS-IS pro-
cess per router.
In global configuration mode, configure IS-IS dynamic routing on the
router:
1. Enable IS-IS routing and enter rou ter configuration mode.
router isis [
tag
]