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Cisco IOS IP Configuration Guide
Configuring Integrated IS-IS
This chapter describes how to configure Integrated Intermediate System-to-Intermediate System (IS-IS).
For a complete description of the integrated IS-IS commands listed in this chapter, refer to the
“Integrated IS-IS Commands” chapter of the Cisco IOS IP Command Reference, Volume 2 of 3: Routing
Protocols publication. To locate documentation of other commands that appear in this chapter, use the
command reference master index, or search online.
IS-IS is an International Organization for Standardization (ISO) dynamic routing specification. IS-IS is
described in ISO 10589. The Cisco implementation of IS-IS allows you to configure IS-IS as an IP
routing protocol.
To identify the hardware platform or software image information associated with a feature, use the
Feature Navigator on Cisco.com to search for information about the feature or refer to the software
release notes for a specific release. For more information, see the “Identifying Supported Platforms”
section in the “Using Cisco IOS Software” chapter in this book.
IS-IS Configuration Task List
To configure IS-IS, perform the tasks described in the following sections. The tasks in the first section
are required; the tasks in the remaining sections are optional:
• Enabling IS-IS and Assigning Areas (Required)
• Enabling IP Routing for an Area on an Interface (Optional)
• Monitoring IS-IS (Optional)
In addition, you can filter routing information and specify route redistribution. For more information
about these features, see the “Filter Routing Information” and “Redistribute Routing Information”
sections, respectively, in the “Configuring IP Routing Protocol-Independent Features” chapter of this
document.
Enabling IS-IS and Assigning Areas
Unlike other routing protocols, enabling IS-IS requires that you create an IS-IS routing process and
assign it to a specific interface, rather than to a network. You can specify more than one IS-IS routing
process per Cisco router, using the multiarea IS-IS configuration syntax. You then configure the
parameters for each instance of the IS-IS routing process.
Note Multiarea IS-IS is supported only for ISO CLNS.