MPLS Forwarding Commands on Cisco IOS XR Software

mpls ip-ttl-propagate

mpls ip-ttl-propagate

To configure the behavior controlling the propagation of the IP Time-To-Live (TTL) field to and from the MPLS header, use the mpls ip-ttl-propagatecommand in global configuration mode. To return to the default behavior, use the no form of this command.

mpls ip-ttl-propagate disable no mpls ip-ttl-propagate

Syntax Description

Defaults

Command Modes

Command History

disable

Stops the propagation of IP TTL to and from the MPLS header.

Enabled

 

Global configuration

 

 

 

Release

Modification

 

 

Release 2.0

This command was introduced on the Cisco CRS-1.

 

 

Release 3.0

No modification.

 

 

Release 3.2

This command was supported on the Cisco XR 12000 Series Router.

 

 

Release 3.3.0

No modification.

 

 

Usage Guidelines

 

To use this command, you must be in a user group associated with a task group that includes the proper

 

 

task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on

 

 

Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.

 

 

By default, the IP TTL is propagated to the MPLS header when IP packets enter the MPLS domain.

 

 

Within the MPLS domain, the MPLS TTL is decremented at each MPLS hop. When an MPLS

 

 

encapsulated IP packet exits the MPLS domain, the MPLS TTL is propagated to the IP header. When

 

 

propagation is disabled, the MPLS TTL is set to 255 during the label imposition phase and the IP TTL

 

 

is not altered.

 

 

 

 

 

 

 

Task ID

 

Task ID

Operations

 

 

 

 

 

 

 

 

mpls-te, mpls-ldp

read, write, read, write

 

 

 

 

 

 

 

 

 

Examples

 

The following example shows how to disable IP TTL propagation:

 

 

RP/0/RP0/CPU0:router(config)# mpls ip-ttl-propagate disable

Cisco IOS XR Multiprotocol Label Switching Command Reference

MPR-154

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Cisco Systems MPR-151 Mpls ip-ttl-propagate, Syntax Description Defaults Command Modes Command History, Usage Guidelines

MPR-151 specifications

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