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Cisco IOS Software Releases 12.3 T

Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

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Table Of Contents

Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Contents

Prerequisites for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Information About Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Benefits of Using the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters Feature

How to Configure Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Shutting Down the IS-IS Protocol in Interface Mode

Shutting Down the IS-IS Protocol and Maintaining IS-IS Configuration Parameters in Router Mode

Configuration Examples for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Shutting Down the IS-IS Protocol in Interface Mode: Example

Shutting Down the IS-IS Protocol in Router Mode: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

isis protocol shutdown

protocol shutdown


Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

This feature allows you to disable the Integrated Intermediate System-to-Intermediate System (IS-IS) protocol at the interface level or at the global IS-IS process level without removing the IS-IS configuration parameters.

History for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Release
Modification

12.3(4)T

This feature was introduced.

12.0(27)S

This feature was integrated into Cisco IOS Release 12.0(27)S.

12.2(25)S

This feature was integrated into Cisco IOS Release 12.2(25)S.

12.2(18)SXE

This feature was integrated into Cisco IOS Release 12.2(18)SXE.

12.2(27)SBC

This feature was integrated into Cisco IOS Release 12.2(27)SBC.


Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

Contents

•Prerequisites for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

•Information About Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

•How to Configure Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

•Configuration Examples for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

•Additional References

•Command Reference

Prerequisites for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

It is presumed that you have IS-IS configured in your network.

Information About Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

Before you enable the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters feature, you should understand the following concept:

•Benefits of Using the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters Feature

Benefits of Using the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters Feature

Before the introduction of the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters feature, there was no nondestructive way to disable IS-IS operation. The only way to disable IS-IS at the router level was to issue the no router isis command, which removes the IS-IS configuration. At the interface level there are two ways to disable IS-IS operation. You can enter the no ip router isis command to either remove IS-IS from the specified interface or you can put the interface into passive mode such that the IP address of the specified interface will still be advertised. In either case, the current IS-IS configuration will be removed.

The Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters feature allows users to set the IS-IS protocol into an administrative state. If the router was rebooted when the protocol was turned off, the protocol would be expected to come back up in the disabled state.When the protocol is set to the administrative state, network administrators are allowed to administratively turn off the operation of the IS-IS protocol without losing the protocol configuration, to make a series of changes to the protocol configuration without having the operation of the protocol transition through intermediate —and perhaps undesirable—states, and then reenable the protocol at a suitable time.

At the interface level, the feature will disable the operation of the protocol on the interface, no IS-IS protocol data unit (PDU) will be sent out on the specified interface, and the received IS-IS PDU will be discarded. Any existing adjacencies will be removed and no new adjacencies will be formed. A link-state packet (LSP) will rebuild its IS-IS LSP database to remove the IP address of the specified interface.

At the router level, the feature will completely disable the operation of the protocol by internally controlling timers and other variables. However, IS-IS updates and router processes will remain functioning. The LSP database will be cleared, and all IS-IS routes that have been added to the Routing Information Database (RIB) will be removed, and all adjacencies associated with the IS-IS instance will be deleted.

How to Configure Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

This section contains the following procedures:

•Shutting Down the IS-IS Protocol in Interface Mode (optional)

•Shutting Down the IS-IS Protocol and Maintaining IS-IS Configuration Parameters in Router Mode (optional)

Shutting Down the IS-IS Protocol in Interface Mode

This task describes how to disable the IS-IS protocol in interface configuration mode so that it will not form adjacencies in the specified interface. The IP address of the specified interface will be placed into the LSP that is generated by the router.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. isis protocol shutdown

5. end

DETAILED STEPS

 
Command
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface type number

Example:

Router(config)# interface Ethernet 0

Configures an interface and enters interface configuration mode.

Step 4 

isis protocol shutdown

Example:

Router(config-if)# isis protocol shutdown

Disables the IS-IS protocol so that it cannot form adjacencies on a specified interface and places the IP address of the interface into the LSP that is generated by the router.

Step 5 

end

Example:

Router(config-if)# end

(Optional) Saves configuration commands to the running configuration file, exits interface configuration mode, and returns the router to privileged EXEC mode.

Shutting Down the IS-IS Protocol and Maintaining IS-IS Configuration Parameters in Router Mode

This task describes how to disable the IS-IS protocol in router configuration mode so that no adjacencies are formed on any interface and that the IS-IS LSP database is cleared while IS-IS still runs on the router.

SUMMARY STEPS

1. enable

2. configure terminal

3. router isis area-tag

4. protocol shutdown

5. end

DETAILED STEPS

 
Command
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

router isis area-tag

Example:

Router(config)# router isis 1

Enables the IS-IS routing protocol and specifies an IS-IS process. Enters router configuration mode.

Step 4 

protocol shutdown

Example:

Router(config-router)# protocol shutdown

Prevents IS-IS from forming any adjacency on any interface and clears the IS-IS LSP database, without actually removing the IS-IS configuration.

Step 5 

end

Example:

Router(config-router)# end

(Optional) Saves configuration commands to the running configuration file, exits router configuration mode, and returns to privileged EXEC mode.

Configuration Examples for Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters

This section contains the following configuration examples:

•Shutting Down the IS-IS Protocol in Interface Mode: Example

•Shutting Down the IS-IS Protocol in Router Mode: Example

Shutting Down the IS-IS Protocol in Interface Mode: Example

The following router output shows that the router has two IS-IS adjacencies: 

Router# show clns neighbors



System Id  Interface  SNPA            State  Holdtime  Type      Protocol


first      Et3/1      0002.7dd6.1c21  Up     25        L1L2      IS-IS

second     Et3/2      0004.6d25.c056  Up     29        L1L2      IS-IS

When the isis protocol shutdown command is entered for Ethernet interface 3/1, the IS-IS protocol will be disabled for the specified interface: 

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# interface ethernet3/1

Router(config-if)# isis protocol shutdown

Router(config-if)# end

The following router output shows that the adjacency for interface 3/1 has not formed: 

Router# show clns neighbors


System Id  Interface  SNPA            State  Holdtime  Type      Protocol


second     Et3/2      0004.6d25.c056  Up     27        L1L2      IS-IS

Shutting Down the IS-IS Protocol in Router Mode: Example

The following router output shows that the router has two IS-IS adjacencies: 

System Id  Interface  SNPA            State  Holdtime  Type      Protocol

south      Et3/1      0002.7dd6.1c21  Up     29        L1L2      IS-IS

north      Et3/2      0004.6d25.c056  Up     28        L1L2      IS-IS

The protocol shutdown command is entered so that IS-IS is disabled and no adjacencies will be formed on any interface: 

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# router isis area1

Router(config-router)# protocol shutdown

Router(config-router)# end

The following router output now shows that both adjacencies are gone. 

System Id  Interface  SNPA            State  Holdtime  Type      Protocol

When the no protocol shutdown command is entered, the adjacencies will again be formed on both interfaces: 

Router(config)# router isis area1

Router(config-router)# no protocol shutdown

Router(config-router)# end

Router# show clns neighbors


System Id  Interface  SNPA            State  Holdtime  Type      Protocol

south      Et3/1      0002.7dd6.1c21  Up     24        L1L2      IS-IS

north      Et3/2      0004.6d25.c056  Up     24        L1L2      IS-IS

Additional References

The following sections provide references related to the Integrated IS-IS Protocol Shutdown Support Maintaining Configuration Parameters feature.

Related Documents

Related Topic
Document Title

IS-IS routing protocol

•"Integrated IS-IS Commands" chapter in the Cisco IOS IP Command Reference, Volume 2 of 4: Routing Protocols, Release 12.3T

•"Configuring Integrated IS-IS" chapter in the Cisco IOS IP Configuration Guide


Standards

Standards
Title

None

—


MIBs

MIBs
MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFCs
Title

None

—


Technical Assistance

Description
Link

The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport


Command Reference

This section documents the following modified commands only.

•isis protocol shutdown

•protocol shutdown

isis protocol shutdown

To disable the Intermediate System-to-Intermediate System (IS-IS) protocol so that it cannot form adjacencies on a specified interface and place the IP address of the interface into the link-state packet (LSP) that is generated by the router, use the isis protocol shutdown command in interface configuration mode. To reenable the IS-IS protocol, use the no form of this command.

isis protocol shutdown

no isis protocol shutdown

Syntax Description

This command has no arguments or keywords.

Defaults

No default behavior or values

Command Modes

Interface configuration

Command History

Release
Modification

12.3(4)T

This command was introduced.

12.2(25)S

This command was intergrated into Cisco IOS Release 12.2(25)S.

12.2(18)SXE

This command was integrated into Cisco IOS Release12.2(18)SXE.

12.2(27)SBC

This command was integrated into Cisco IOS Release12.2(27)SBC.


Usage Guidelines

The isis protocol shutdown command allows you to disable the IS-IS protocol for a specified interface without removing the configuration parameters. The IS-IS protocol will not form any adjacencies for the interface for which the isis protocol shutdown command has been configured, and the IP address of the interface will be put into the LSP that is generated by the router.

If you do not want IS-IS to form any adjacency on any interface and clear the IS-IS LSP database, you can enter the protocol shutdown command.

Examples

The following example disables the IS-IS protocol on Ethernet interface3/1: 

Router(config)# interface Ethernet 3/1

Router(config-if)# isis protocol shutdown

Related Commands

Command
Description

protocol shutdown

Disables the IS-IS protocol so that it cannot form any adjacency on any interface and clears the IS-IS LSP database.


protocol shutdown

To disable the Intermediate System-to-Intermediate System (IS-IS) protocol so that it cannot form any adjacency on any interface and will clear the IS-IS link-state packet (LSP) database, use the protocol shutdown command in router configuration mode. To reenable the IS-IS protocol, use the no form of this command.

protocol shutdown

no protocol shutdown

Syntax Description

This command has no arguments or keywords.

Defaults

No default behavior or values

Command Modes

Router configuration

Command History

Release
Modification

12.3(4)T

This command was introduced.

12.2(25)S

This command was intergrated into Cisco IOS Release 12.2(25)S.

12.2(18)SXE

This command was integrated into Cisco IOS Release12.2(18)SXE.

12.2(27)SBC

This command was integrated into Cisco IOS Release12.2(27)SBC.


Usage Guidelines

The protocol shutdown command allows you to disable the IS-IS protocol for a specific routing instance without removing any existing IS-IS configurations parameters. When you enter the protocol shutdown command, the IS-IS protocol will continue to run on the router, and you can use the current IS-IS configuration, but IS-IS will not form any adjacencies on any interface, and it will also clear the IS-IS LSP database.

If you want to disable the IS-IS protocol for a specific interface, use the isis protocol shutdown command.

Examples

The following example disables the IS-IS protocol for a specific routing instance: 

Router(config)# router isis area1

Router(config-router)# protocol shutdown

Related Commands

Command
Description

isis protocol shutdown

Disables the IS-IS protocol so that it cannot form adjacencies on a specified interface and places the IP address of the interface into the LSP that is generated by the router.


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