Specifications

mpls ttl-dec
MP-358
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
mpls ttl-dec
To specify standard Multiprotocol Label Switching (MPLS) tagging, use the mpls ttl-dec command in
global configuration mode. To return to the default settings, use the no form of this command.
mpls ttl-dec
no mpls ttl-dec
Syntax Description This command has no arguments or keywords.
Defaults Optimized MPLS tagging (no
mpls ttl-dec).
Command Modes Global configuration
Command History
Usage Guidelines In Cisco IOS Release 12.2(18)SXE and later releases, MPLS tagging has been optimized to allow the
r
ewriting of the original packet’s IP type of service (ToS) and Time to Live (TTL) values before the
MPLS label is pushed onto the packet header. This change can result in a slightly lower performance for
certain types of traffic. If the packet’s original ToS/TTL values are not significant, you enter the mpls
ttl-dec command for standard MPLS tagging.
Examples This example shows how to configure the Cisco 7600 series router to use standard MPLS tagging
be
havior:
Router(config)# mpls ttl-dec
Router(config)#
This example shows how to configure the Cisco 7600 series router to use optimized MPLS tagging
behavior:
Router(config)# no mpls ttl-dec
Router(config)#
Related Commands
Release Modification
12.2(18)SXE This command was introduced on the Supervisor Engine 720.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
Command Description
mpls l2transport route Enables routing of Layer 2 packets over MPLS.