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Cisco IOS Software Releases 12.3 T

Integrated IS-IS Global Default Metric

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Table Of Contents

Integrated IS-IS Global Default Metric

Contents

Prerequisites for Integrated IS-IS Global Default Metric

Restrictions for Integrated IS-IS Global Default Metric

Information About Integrated IS-IS Global Default Metric

Benefits of Using the Integrated IS-IS Global Default Metric Feature

How to Configure the Integrated IS-IS Global Default Metric Feature

Changing the Global IS-IS IPv4 Default Metric for IPv4 Networks

Changing the Global IS-IS IPv6 Default Metric for IPv6 Networks

Configuration Examples for the Integrated IS-IS Global Default Metric Feature

Setting a Global Default Metric for IPv4: Example

Setting a Global Default Metric for IPv6: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

metric


Integrated IS-IS Global Default Metric

The Integrated IS-IS Global Default Metric feature allows you to change the global Intermediate System-to-Intermediate System (IS-IS) default metric for interfaces so that you need not change the metric values for the interfaces one by one. All interfaces that had the original IS-IS default metric 10 will be configured with the new default value.

History for the Integrated IS-IS Global Default Metric Feature

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

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Contents

•Prerequisites for Integrated IS-IS Global Default Metric

•Restrictions for Integrated IS-IS Global Default Metric

•Information About Integrated IS-IS Global Default Metric

•How to Configure the Integrated IS-IS Global Default Metric Feature

•Configuration Examples for the Integrated IS-IS Global Default Metric Feature

•Additional References

•Command Reference

Prerequisites for Integrated IS-IS Global Default Metric

•You must have IS-IS configured in your network.

•You must be familiar with IPv4. Refer to the publications referenced in the "Related Documents" section for IPv4 configuration and command reference information.

•You must be familiar with IPv6 addressing and basic configuration. Refer to the publications referenced in the "Related Documents" section for implementing basic connectivity for IPv6.

Restrictions for Integrated IS-IS Global Default Metric

If you have already configured a metric for a specific interface by entering either the isis metric command or the isis ipv6 metric command, the metric that has been configured for that specific interface will take precedence over any global default set by the metric command introduced by this feature.

Information About Integrated IS-IS Global Default Metric

Before you enable the Integrated IS-IS Global Default Metric feature, you should understand the following concept:

•Benefits of Using the Integrated IS-IS Global Default Metric Feature

Benefits of Using the Integrated IS-IS Global Default Metric Feature

IS-IS has a default active interface metric value of 10 in Cisco IOS software. If the interface is passive, the default value is zero. You can change the metric value for a specific interface by using the isis metric command or the isis ipv6 metric command. If all IS-IS interfaces metric values need to be changed to some value other than the default value, the change needs to be made one by one on all IS-IS interfaces.

The Integrated IS-IS Global Default Metric feature allows you to use one command to change the metric value globally for all IS-IS interfaces. Besides offering the user the convenience of being able to globally configure the value for all IS-IS interfaces, the feature helps prevent errors that occur when interfaces are individually configured to change the metric value: user can remove metrics from an interface and then add the interface back into IS-IS without a set metric, thereby allowing the default metric 10—unintentionally making that interface a highly preferred one in the network. Such an occurrence on the wrong interface could mean the rerouting of traffic across the network on an undesirable path.

How to Configure the Integrated IS-IS Global Default Metric Feature

This section contains the following procedures:

•Changing the Global IS-IS IPv4 Default Metric for IPv4 Networks

•Changing the Global IS-IS IPv6 Default Metric for IPv6 Networks

Changing the Global IS-IS IPv4 Default Metric for IPv4 Networks

This section describes how to change the global IS-IS IPv4 default metric for interfaces for networks using IPv4.

SUMMARY STEPS

1. enable

2. configure terminal

3. router isis [tag]

4. net network-entity-title

5. metric-style wide

6. metric default-value [level-1 | level-2]

7. end

8. show clns interface type number

DETAILED STEPS

 
Command or Action
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 [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 

net network-entity-title

Example:

Router(config-router)# net 01.0000.0309.1234.0

Configures an IS-IS network entity title (NET) for a Connectionless Network Service (CLNS) routing process.

Step 5 

metric-style wide

Example:

Router(config-router)# metric-style wide

(Optional) Configures a router running IS-IS so that it generates and accepts type, length, and value (TLV) object 135 for IP addresses.

•If you do not enter the metric-style wide command, the default metric style is narrow.

Step 6 

metric default-value [level-1 | level-2]

Example:

Router(config-router)# metric 25 level-2

Globally sets a new default metric value for all IS-IS interfaces.

•The value 25 shown in the example will apply only to Level 2 IS-IS interfaces. If you do not enter the level-1 or level-2 keyword, the metric will be applied to both Level 1 and Level 2 IS-IS interfaces.

Step 7 

end

Example:

Router(config-router)# end

Exits router configuration mode.

Step 8 

show clns interface type number

Example:

Router# show clns interface ethernet 0/1

(Optional) Lists the CLNS-specific information about each interface.

•Enter this command if you want to verify the global default metric.

Changing the Global IS-IS IPv6 Default Metric for IPv6 Networks

This section describes how to change the global IS-IS IPv6 default metric for interfaces for IS-IS IPv6 networks.

SUMMARY STEPS

1. enable

2. configure terminal

3. ipv6 unicast-routing

4. router isis [tag]

5. net network-entity-title

6. metric-style wide

7. address-family ipv6 [unicast]

8. metric default-value [level-1 | level-2]

9. exit-address-family

10. end

11. show clns interface type number

DETAILED STEPS

 
Command or Action
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 

ipv6 unicast-routing

Example:

Router(config)# ipv6 unicast-routing

Enables the forwarding of IPv6 unicast datagrams.

Step 4 

router isis [tag]

Example:

Router(config)# router isis 1

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

Step 5 

net network-entity-title

Example:

Router(config-router)# net 01.0000.0309.1234.0

Configures an IS-IS NET for a CLNS routing process.

Step 6 

metric-style wide

Example:

Router(config-router)# metric-style wide

Configures a router running IS-IS so that it generates and accepts TLV object 135 for IP addresses.

•For IS-IS IPv6, the metric-style wide command must be entered.

Step 7 

address-family ipv6 [unicast]

Example:

Router(config-router)# address-family ipv6

Enters address family configuration mode for configuring IS-IS routing sessions that use standard IPv6 address prefixes.

Step 8 

metric default-value [level-1 | level-2]

Example:

Router(address-family)# metric 25

Globally sets a new default metric value for all IS-IS interfaces.

•If you do not enter the level-1 or level-2 keyword, the metric will be applied to both Level 1 and Level 2 IS-IS interfaces.

Step 9 

exit-address-family

Example:

Router(address-family)# exit-address-family

Exits address family configuration mode.

Step 10 

end

Example:

Router(config-router)# end

(Optional) Returns to privileged EXEC mode.

Step 11 

show clns interface type number

Example:

Router# show clns interface ethernet 0/1

Optional. Lists the CLNS-specific information about each interface.

•Enter this command if you want to verify the global default metric.

Configuration Examples for the Integrated IS-IS Global Default Metric Feature

This section contains the following configuration examples:

•Setting a Global Default Metric for IPv4: Example

•Setting a Global Default Metric for IPv6: Example

Setting a Global Default Metric for IPv4: Example

The following example sets a global default metric of 111 for the IS-IS interfaces. 

interface Ethernet3/1

 ip address 172.16.10.2 255.255.0.0

 ip router isis area1

 no ip route-cache

 duplex half

!

interface Ethernet3/2

 ip address 192.168.10.10 255.255.255.0

 ip router isis area1

 no ip route-cache

 duplex half

router isis area1

 net 01.0000.0309.1234.00

 metric-style wide

 metric 111

In the following example, the show clns interface command confirms that the IS-IS IPv4 interface metric for both Level 1 and Level 2 interfaces is assigned the new default metric value 111: 

Router# show clns interface


Ethernet3/1 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 39 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x0, local circuit ID 0x1

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.01

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 0

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.01

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 0

    Next IS-IS LAN Level-1 Hello in 922 milliseconds

    Next IS-IS LAN Level-2 Hello in 1 seconds

Ethernet3/2 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 20 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x1, local circuit ID 0x2

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 1

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 1

    Next IS-IS LAN Level-1 Hello in 2 seconds

    Next IS-IS LAN Level-2 Hello in 1 seconds

In the following example, the isis metric command is entered so that it will assign a metric value of 10. The metric value that is set with the isis metric command for the specific Ethernet interface 3/1 will take precedence over the metric value that was previously set with the metric command. 

interface Ethernet3/1

 ip address 172.30.10.2 255.255.0.0

 ip router isis area1

 no ip route-cache

 duplex half

 isis metric 10

!

interface Ethernet3/2

 ip address 192.168.10.10 255.255.255.0

 ip router isis area1

 no ip route-cache

 duplex half

router isis area1

 net 01.0000.0309.1234.00

 metric-style wide

 metric 111

When the show clns command is entered, the router output confirms that the interface has an assigned IS-IS IPv4 metric value of 10: 

show clns interface

Ethernet3/1 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 53 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x0, local circuit ID 0x1

    Level-1 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 0

    Level-2 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 0

    Next IS-IS LAN Level-1 Hello in 4 seconds

    Next IS-IS LAN Level-2 Hello in 4 seconds

Ethernet3/2 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 30 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x1, local circuit ID 0x2

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 1

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 1

    Next IS-IS LAN Level-1 Hello in 2 seconds

    Next IS-IS LAN Level-2 Hello in 922 milliseconds

Setting a Global Default Metric for IPv6: Example

The following example changes the IS-IS IPv6 metric to 10 for Ethernet interface 3/2: 

interface Ethernet3/1

 ip address 172.19.10.2 255.255.0.0

 ip router isis area1

 no ip route-cache

 duplex half

 isis metric 10

!

interface Ethernet3/2

 ip address 172.29.10.10 255.255.255.0

 ip router isis area1

 no ip route-cache

 duplex half

 isis ipv6 metric 10

!

router isis area1

 net 01.0000.0309.1234.00

 metric-style wide

 metric 111

 !

 address-family ipv6

 metric 222

 exit-address-family

!

In the following example, the show clns interface command is entered and the router output shows that, for IPv6 interfaces, the metric value of 10 that was entered with the isis ipv6 metric command takes precedence over the metric value of 222 that has been set with the metric command: 

Router# show clns interface


Ethernet3/1 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 9 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x0, local circuit ID 0x1

    Level-1 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-1 IPv6 Metric: 222

    Number of active level-1 adjacencies: 0

    Level-2 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-2 IPv6 Metric: 222

    Number of active level-2 adjacencies: 0

    Next IS-IS LAN Level-1 Hello in 2 seconds

    Next IS-IS LAN Level-2 Hello in 3 seconds

Ethernet3/2 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 36 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x1, local circuit ID 0x2

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 1

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 1

    Next IS-IS LAN Level-1 Hello in 482 milliseconds

    Next IS-IS LAN Level-2 Hello in 932 milliseconds

Additional References

The following sections provide references related to the Integrated IS-IS Global Default Metric 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, Release 12.3

Configuring IPv6

"Implementing Basic Connectivity for IPv6" chapter in the Cisco IOS IPv6 Configuration Library

Configuring the IS-IS protocol for IPv6 networks

"Implementing Multitopology IS-IS for IPv6" chapter in Integrated IS-IS Multi-Topology for IS-IS IPv6, Release 12.3


Standards

Standards
Title

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

—


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

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

—


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 command only.

•metric

metric

To globally change the metric value for all Intermediate System-to-Intermediate System (IS-IS) interfaces, use the metric command in interface configuration mode or address family configuration mode. To disable the metric value and reinstate the default metric value of 10, use the no form of this command.

metric default-value [level-1 | level-2]

no metric default-value [level-1 | level-2]

Syntax Description

default-value

Metric value to be assigned to the link and used to calculate the path cost via the links to destinations. You can configure this metric for Level 1 or Level 2 routing only. For style wide metrics the range is from 1 to 16777214. For style narrow metrics the range is from 1 to 63.

level-1

(Optional) Set IS-IS Level-1 IPv4 or IPv6 metric.

level-2

(Optional) Set IS-IS Level-2 IPv4 or IPv6 metric.


Defaults

The default value for active IS-IS interfaces is 10; the default value for inactive IS-IS interfaces is 0. If the level-1 or level-2 keyword is not entered, the metric will be applied to both Level 1 and Level 2 IS-IS interfaces.

Command Modes

Interface configuration
Address family configuration

Command History

Release
Modification

12.3(4)T

This command was introduced.

12.0(27)S

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

12.2(25)S

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

12.2(18)SXE

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

12.2(27)SBC

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


Usage Guidelines

When you need to change the default metric value for all IS-IS interfaces, it is recommended to use the metric command in order to configure all interfaces globally. Globally configuring the metric values prevents user errors, such as unintentionally removing a set metric from an interface without configuring a new value and unintentionally allowing the interface to revert to the default metric of 10, thereby becoming a highly preferred interface in the network.

For networks running IPv4, enter the metric command in interface configuration mode. For networks running IPv6, enter the metric command in address family configuration mode.

Once you enter the metric command to change the default IS-IS interface metric value, an enabled interface will use the new value instead of the default value of 10. Passive interfaces will continue to use the metric value of 0.

Note The metric value that is directly configured for a specific interface with either the isis metric command or the isis ipv6 metric command will always take precedence over the metric value that you configure with the metric command.

Examples

The following example configures the IS-IS interfaces with a global default value of 111 for an IS-IS IPv4 network: 

interface Ethernet3/1

 ip address 10.10.10.2 255.255.0.0

 ip router isis area1

 no ip route-cache

 duplex half

!

interface Ethernet3/2

 ip address 10.10.10.130 255.255.255.0

 ip router isis area1

 no ip route-cache

 duplex half

!

router isis area1

 net 01.0000.0309.1234.00

 metric-style wide

 metric 111

Entering the show clns interface command returns the following information: 

Router# show clns interface


Ethernet3/1 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 39 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x0, local circuit ID 0x1

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.01

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 0

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.01

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 0

    Next IS-IS LAN Level-1 Hello in 922 milliseconds

    Next IS-IS LAN Level-2 Hello in 1 seconds

Ethernet3/2 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 20 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x1, local circuit ID 0x2

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-1 IPv6 Metric: 10

    Number of active level-1 adjacencies: 1

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-2 IPv6 Metric: 10

    Number of active level-2 adjacencies: 1

    Next IS-IS LAN Level-1 Hello in 2 seconds

    Next IS-IS LAN Level-2 Hello in 1 seconds

The following example configures IPv6 for IS-IS and a global default value of 222 IPv6 metric for the IS-IS interfaces. The metric of 10 that was entered using the isis metric command will take precedence. 

interface Ethernet3/1

 ip address 10.10.10.2 255.255.0.0

 ip router isis area1

 no ip route-cache

 duplex half

 isis metric 10

!

interface Ethernet3/2

 ip address 10.10.10.10 255.255.255.0

 ip router isis area1

 no ip route-cache

 duplex half

router isis area1

 net 01.0000.0309.1234.00

 metric-style wide

 metric 111

 !

 address-family ipv6

 metric 222

 exit-address-family

Enter the show clns interface command to verify that the global default metric for IS-IS IPv6 interfaces for IPv6 network is 222: 

Router# show clns interface


Ethernet3/1 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 51 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x0, local circuit ID 0x1

    Level-1 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-1 IPv6 Metric: 222

    Number of active level-1 adjacencies: 0

    Level-2 Metric: 10, Priority: 64, Circuit ID: mekong.01

    Level-2 IPv6 Metric: 222

    Number of active level-2 adjacencies: 0

    Next IS-IS LAN Level-1 Hello in 2 seconds

    Next IS-IS LAN Level-2 Hello in 2 seconds

Ethernet3/2 is up, line protocol is up

  Checksums enabled, MTU 1497, Encapsulation SAP

  ERPDUs enabled, min. interval 10 msec.

  CLNS fast switching enabled

  CLNS SSE switching disabled

  DEC compatibility mode OFF for this interface

  Next ESH/ISH in 17 seconds

  Routing Protocol: IS-IS

    Circuit Type: level-1-2

    Interface number 0x1, local circuit ID 0x2

    Level-1 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-1 IPv6 Metric: 222

    Number of active level-1 adjacencies: 1

    Level-2 Metric: 111, Priority: 64, Circuit ID: mekong.02

    Level-2 IPv6 Metric: 222

    Number of active level-2 adjacencies: 1

    Next IS-IS LAN Level-1 Hello in 1 seconds

    Next IS-IS LAN Level-2 Hello in 89 milliseconds

Related Commands

Command
Description

isis ipv6 metric

Configures the value of an IS-IS IPv6 metric.

isis metric

Configures the metric for an interface.


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