Specifications

Implementing IS-IS on Cisco IOS XR Software
Contents
RC-168
Cisco IOS XR Routing Configuration Guide
Contents
• Prerequisites for Implementing IS-IS on Cisco IOS XR Software, page RC-168
• Restrictions for Implementing IS-IS on Cisco IOS XR Software, page RC-168
• Information About Implementing IS-IS on Cisco IOS XR Software, page RC-168
• How to Implement IS-IS on Cisco IOS XR Software, page RC-179
• Configuration Examples for Implementing IS-IS on Cisco IOS XR Software, page RC-216
• Where to Go Next, page RC-218
• Additional References, page RC-219
Prerequisites for Implementing IS-IS on Cisco IOS XR Software
You must be in a user group associated with a task group that includes the proper task IDs for IS-IS
commands. For detailed information about user groups and task IDs, see the Configuring AAA Services
on Cisco IOS XR Software module of Cisco IOS XR System Security Configuration Guide.
Restrictions for Implementing IS-IS on Cisco IOS XR Software
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.
Information About Implementing IS-IS on Cisco IOS XR Software
To implement IS-IS you need to understand the following concepts:
• IS-IS Functional Overview, page RC-169
• Key Features Supported in the Cisco IOS XR IS-IS Implementation, page RC-170
• IS-IS Configuration Grouping, page RC-170
• IS-IS Configuration Modes, page RC-170
Release 3.4.0 Support was added for the following features:
• MPLS TE forwarding adjacency
• MPLS TE interarea tunnels
• Multicast topology
Release 3.5.0 Support was added for the following features:
• IS-IS keychain support for hello and LSP authentication and hitless key
rollover
• IP fast reroute loop-free alternates computation
• Label Distribution Protocol (LDP) Interior Gateway Protocol (IGP)
auto-configuration