Chapter 5 Implementing Is-Is; Prerequisites For Implementing Is-Is; Restrictions For Implementing Is-Is - Cisco ASR 9000 Series Configuration Manual

Implementing IS-IS
Integrated Intermediate System-to-Intermediate System (IS-IS), Internet Protocol Version 4 (IPv4), is a
standards-based Interior Gateway Protocol (IGP). The Cisco software implements the IP routing capabilities
described in International Organization for Standardization (ISO)/International Engineering Consortium
(IEC) 10589 and RFC 1995, and adds the standard extensions for single topology and multitopology IS-IS
for IP Version 6 (IPv6).
This module describes how to implement IS-IS (IPv4 and IPv6) on your Cisco IOS XR network.
Currently, only default VRF is supported. VPNv4, VPNv6 and VPN routing and forwarding (VRF) address
Note
families, L3VPN and Multicast will be supported in a future release.
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Prerequisites for Implementing IS-IS

You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment is
preventing you from using a command, contact your AAA administrator for assistance.

Restrictions for Implementing IS-IS

When multiple instances of IS-IS are being run, an interface can be associated with only one instance (process).
Instances may not share an interface.
OL-30423-03
Prerequisites for Implementing IS-IS, page 273
Restrictions for Implementing IS-IS, page 273
Information About Implementing IS-IS , page 274
Configuration Examples for Implementing IS-IS , page 325
Where to Go Next, page 327
Additional References, page 328
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