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RC-265
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Implementing IS-IS on Cisco IOS XR Software
Integrated Intermediate System-to-Intermediate System (IS-IS), Internet Protocol Version 4 (IPv4), is a
standards-based Interior Gateway Protocol (IGP).
Cisco IOS XR 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 the new and revised tasks you need to implement IS-IS (IPv4 and IPv6) on your
Cisco IOS XR network.
Note For more information about IS-IS on Cisco IOS XR software and complete descriptions of the IS-IS
commands listed in this module, you can refer to the “Related Documents” section of this module. To
locate documentation for other commands that might appear while of executing a configuration task,
search online in the Cisco IOS XR software master command index.
Feature History for Implementing IS-IS on Cisco IOS XR Software
Release Modification
Release 2.0 This feature was introduced on the Cisco CRS-1.
Release 3.0 No modification.
Release 3.2 Support was added for the Cisco XR 12000 Series Router. The ability to
configure a broadcast medium connecting two networking devices as a
point-to-point link was added.
Release 3.3.0 LDP IGP synchronization support was added for IPv4 unicast address
families. See the “MPLS Label Distribution Protocol IGP Synchronization”
section on page RC-275 and “Configuring MPLS LDP IS-IS
Synchronization” section on page RC-306 for more information.
The ispf startup-delay command was removed from the “Setting SPF
Interval for a Single-Topology IPv4 and IPv6 Configuration” section on
page RC-301.
Release 3.4.0 Support was added for the following features:
• MPLS TE forwarding adjacency
• MPLS TE interarea tunnels
• Multicast topology