SRv6 Traffic Engineering

This chapter describes the commands used to configure and use SRv6 Traffic Engineering.

To use commands of this module, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using any command, contact your AAA administrator for assistance.

accounting prefixes ipv6 mode

To enable SRv6 traffic accounting, use the accounting prefixes ipv6 mode command in XR Config mode.

accounting prefixes ipv6 mode per-prefix per-nexthop srv6-locator

Syntax Description

per-prefix

Enables accounting for every prefix.
per-nexthop

Enables accounting for every prefix and nexthop.
srv6-locator

Enables accounting only for Segment-routing SRv6 locator.

Command Default

None

Command Modes

XR Config

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to enable SRv6 traffic accounting: 

       
Router(config)#accounting prefixes ipv6 mode per-prefix per-nexthop srv6-locators

policy srv6 locator

To create the SRv6-TE policy and configure customized per-policy locator and BSID behavior, use the policy srv6 locator command in the SR-TE interface submode.

policy policy-name srv6 locator locatorname binding-sid dynamic behavior ub6-encaps-reduced Binding-SID

Syntax Description

policy policy-name

Specifies the policy name. The name can be a maximum of 59 characters.
locator locator

Specifies the locator name. The locator name can be a maximum of 64 characters.
binding-sid dynamicbehavior

Configures the BSID dynamic behavior.

ub6-encaps-reduced

Configures BSID with reduced encapsulation behavior.

Reduces the length of the SRH by excluding the first SID in the IPv6 header.

ub6-insert-reduced

Configures BSID with insert reduced behavior.

Command Default

None

Command Modes

SR-TE interface submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

If you don’t specify a customized per-policy locator and BSID behavior, the policy uses the global locator and BSID behavior.

Examples

The following example shows how to create the SRv6-TE policy and configure customized per-policy locator and BSID behavior:

RP/0/RP0/CPU0:ios(config-sr-te)#policy name 
RP/0/RP0/CPU0:ios(config-sr-te-policy)#srv6 
RP/0/RP0/CPU0:ios(config-sr-te-policy-srv6)#locator loc1 binding-sid dynamic behavior ub6-encaps-reduced  
RP/0/RP0/CPU0:ios(config-sr-te-policy-srv6)#

segment-routing traffic-eng srv6

To configure SRv6-TE, use the segment-routing srv6 command in the SR-TE interface submode. To disable SRv6-TE, use the no form of this command.

segment-routing traffic-eng srv6

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

SR-TE interface submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to configure SRv6-TE.


Router(config)#segment-routing traffic-eng 
Router(config-sr-te)#srv6
Router(config-sr-te-srv6)#exit
Router(config-sr-te)#

srv6 locator

To configure SRv6-TE locator and binding SID (BSID) behavior, use the srv6 locator command in the SR-TE interface submode.

Srv6 locator locatorname binding-sid dynamic behavior { ub6-encaps-reduced | ub6-insert-reduced }

Syntax Description

locator locator

Specifies the locator name. The locator name can be a maximum of 64 characters.
binding-sid dynamicbehavior

Configures the BSID dynamic behavior.

ub6-encaps-reduced

Configures BSID with reduced encapsulation behavior.

Reduces the length of the SRH by excluding the first SID in the SRH of the pushed IPv6 header.

ub6-insert-reduced

Configures BSID with insert reduced behavior.

Command Default

None

Command Modes

SR-TE interface submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

If you don’t specify a customized per-policy locator and BSID behavior, the policy uses the global locator and BSID behavior.

Examples

The following example shows how to configure SRv6-TE locator and binding SID (BSID) behavior.

Router#configure
Router(config)#segment-routing traffic-eng 
Router(config-sr-te)#srv6 locator loc1 binding-sid dynamic behavior ub6-encaps-reduced

srv6 maximum-sid-depth

To customize the Maximum SID Depth (MSD) signaled by PCC during PCEP session establishment, use the srv6 maximum-sid-depth command in SR-TE srv6 submode.

maximum-sid-depth value

Syntax Description

maximum-sid-depth value

Specifies the Maximum SID Depth (MSD) value.

The MSD is expressed as a number uSIDs. The number of uSID is expressed as a number of carriers and the number of uSID per carrier. The range is from 1-255.

Command Default

None

Command Modes

SR-TE srv6 submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to customize the MSID: 


Router(config)#segment-routing traffic-eng 
Router(config-sr-te)#srv6
Router(config-sr-te-srv6)#maximum-sid-depth 13
Router(config-sr-te-srv6)#exit
Router(config-sr-te)#

segment-lists segment-list

To configure SRv6 explicit segment list, use the segment-lists segment-list command in SR-TE interface submode.

segment-lists segment-list name srv6 [ index number sid sid-id | topology-check ]

Syntax Description

name

Specifies the name for the segment list.

srv6

Enables the SRv6 segment-list configuration.

indexnumber

Specifies the index number. The range is from 1-65535.

sidsid-id

Specifies the SRv6 SID
topology-check locator

Enables SID verification.

Command Default

None

Command Modes

SR-TE interface submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to configure SRv6 explicit segment list:

Router(config)# segment-routing traffic-eng 
Router(config-sr-te)# segment-lists
Router(config-sr-te-segment-lists)# srv6
Router(config-sr-te-sl-global-srv6)# sid-format usid-f3216 
Router(config-sr-te-sl-global-srv6)# exit
Router(config-sr-te-segment-lists)# segment-list p1_r8_1
Router(config-sr-te-sl-srv6)# index 10 sid FCBB:BB00:10:feff::
Router(config-sr-te-sl-srv6)# index 15 sid FCBB:BB00:100:fe00::
Router(config-sr-te-sl-srv6)# index 20 sid FCBB:BB00:1::
Router(config-sr-te-sl-srv6)# index 30 sid FCBB:BB00:1:fe00::
Router(config-sr-te-sl-srv6)# index 40 sid FCBB:BB00:fe00::
Router(config-sr-te-sl-srv6)# index 50 sid FCBB:BB00:5::
Router(config-sr-te-sl-srv6)# index 60 sid FCBB:BB00:6::

segment-lists srv6

To enable SID validation globally for all SRv6 explicit segment lists, use the segment-lists srv6 command in SR-TE interface submode.

segment-lists srv6 [ sid-format usid-f3216 | topology-check ]

Syntax Description

sid-format usid-f3216

Specifies SID format F3216 micro SID.
topology-check locator

Enables SID verification.

Command Default

None

Command Modes

SR-TE interface submode

Command History

Release Modification
Release 7.10.1

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to specify SID format for all SRv6 explicit segment lists:


Router(config)#segment-routing traffic-eng 
Router(config-sr-te)#segment-lists
Router(config-sr-te-segment-lists)#srv6
Router(config-sr-te-sl-global-srv6)#sid-format usid-f3216
Router(config-sr-te-sl-global-srv6)#exit
Router(config-sr-te-segment-lists)#

The following example shows how to enable SID verification:


Router(config)#segment-routing traffic-eng 
Router(config-sr-te)#segment-lists
Router(config-sr-te-segment-lists)#srv6
Router(config-sr-te-sl-global-srv6)#topology-check 
Router(config-sr-te-sl-global-srv6)#exit
Router(config-sr-te-segment-lists)#