IS-IS Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Release

PDF

IS-IS protocol shutdown mode

Updated: June 9, 2026

Want to summarize with AI?

Log in

Explains IS-IS protocol shutdown mode, its operation and technical context, supported platforms and releases, and outlines its benefits for simplifying maintenance, reducing errors, and ensuring stable and consistent network operations.

IS-IS protocol shutdown mode is a router feature that

  • enables a graceful shutdown of the IS-IS protocol using a single command

  • automatically sets the overload-bit and disables all active IS-IS interfaces (except for Non Stop Routing interfaces), and

  • preserves the local link-state packet (LSP) database and other local data structures to ensure a smooth return to operation.

Table 1. Feature History Table

Feature Name

Release Information

Feature Description

IS-IS protocol shutdown mode

 Release 25.1.1

Introduced in this release on: Fixed Systems (8700 [ASIC: K100], 8010 [ASIC: A100])(select variants only*)

*This feature is supported on:

  • 8712-MOD-M

  • 8011-4G24Y4H-I

IS-IS protocol shutdown mode

 Release 24.4.1

Introduced in this release on: Fixed Systems (8200 [ASIC: P100], 8700 [ASIC: P100])(select variants only*); Modular Systems (8800 [LC ASIC: P100])(select variants only*)

You can now gracefully shut down IS-IS on an interface or router without abruptly interrupting network operations. This feature simplifies operations by consolidating multiple steps into a single command, ensuring network stability during maintenance or configuration changes.

This feature introduces these changes:

CLI:

protocol shutdown

YANG Data Model:

Cisco-IOS-XR-um-router-isis-cfg (refer to GitHub and YANG Data Models Navigator)

*This feature is supported on:

  • 8212-48FH-M

  • 8711-32FH-M

  • 88-LC1-36EH

  • 88-LC1-12TH24FH-E

  • 88-LC1-52Y8H-EM

Benefits of IS-IS protocol shutdown mode

  • Simplifies maintenance by consolidating multiple steps into a single command.

  • Reduces the risk of manual errors during configuration changes.

  • Ensures network stability during maintenance or configuration events.

  • Provides a consistent operational procedure across multiple protocols (similar to OSPF and OSPFv3).

Configure IS-IS protocol shutdown mode

Allow you to control IS-IS protocol operation by activating or deactivating protocol shutdown mode.

Use this task to temporarily disable IS-IS routing without removing its configuration, such as during troubleshooting or maintenance.

Before you begin

  • Access the router CLI with administrative privileges.

  • Verify that IS-IS routing is already configured on your device.

Procedure

1.

Enable IS-IS protocol shutdown mode.

Example:


Router# config
Router(config)# router isis 1
Router(config-isis)# protocol shutdown

To disable protocol shutdown mode and restore IS-IS routing, use:


Router(config-isis)# no protocol shutdown
2.

Verify that protocol shutdown mode is enabled for IS-IS.

Example:


Router# show isis protocol
Protocol shutdown: Yes
3.

Confirm that the IS-IS interface is disabled in protocol shutdown state.

Example:


Router# show isis interface 1
Disabled (Protocol shutdown in IS-IS cfg)