Cisco Cisco IOS Software Release 12.2(27)SBC

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MPLS Traffic Engineering—Automatic Bandwidth Adjustment for TE Tunnels
  Prerequisites
3
Cisco IOS Release: Multiple releases (see the Feature History table)
Prerequisites
Your network must support the following:
MPLS traffic engineering tunnels
IP Cisco Express Forwarding
Configuration Tasks 
Perform the following tasks before you enable automatic bandwidth adjustment:
Configure MPLS tunnels.
Configure Cisco Express Forwarding.
Perform the following tasks to configure automatic bandwidth adjustment:
Configuring a Platform to Support Traffic Engineering Tunnels
To configure a platform to support traffic engineering tunnels, perform the following steps in 
configuration mode:
Command
Purpose
Step 1
Router(config)# ip cef
Enables standard Cisco Express Forwarding 
operation. 
For information about Cisco Express Forwarding 
configuration and the command syntax, see the 
Cisco IOS Switching Services Configuration Guide 
and the Cisco IOS Switching Command Reference.
Step 2
Router(config)# mpls traffic-eng tunnels
Enables the MPLS traffic engineering tunnel feature 
on a device.