Cisco Cisco IOS Software Release 12.0(23)S

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Multiprotocol Label Switching (MPLS) traffic engineering software enables an MPLS backbone to 
replicate and expand upon the traffic engineering capabilities of Layer 2 ATM and Frame Relay 
networks. MPLS is an integration of Layer 2 and Layer 3 technologies. By making traditional Layer 2 
features available to Layer 3, MPLS enables traffic engineering. Thus, you can offer in a one-tier 
network what now can be achieved only by overlaying a Layer 3 network on a Layer 2 network.

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12.0(5)S

This feature was introduced as MPLS Traffic Engineering.

12.1(3)T

This feature was updated and integrated into Cisco IOS Release 12.1(3)T. 
The title of the feature module changed to MPLS Traffic Engineering and 
Enhancements.

12.0(10)ST

This feature was integrated into Cisco IOS Release 12.0(10)ST. 

12.0(22)S

This feature was integrated into Cisco IOS Release 12.0(22)S. 

12.0(23)S

This feature was updated to support the Cisco 10720 Internet router.

12.2(28)SB

This feature was integrated into Cisco IOS Release 12.2(28)SB.