Cisco Cisco IOS Software Release 12.2(18)S

The old command was

tunnel mpls traffic-eng bandwidth b

where b = the amount of bandwidth this tunnel requires.

Now you specify from which pool (global or sub) the tunnel's bandwidth is to come. You can enter

tunnel mpls traffic-eng bandwidth sub-pool b

This indicates that the tunnel should use bandwidth from the sub-pool. Alternatively, you can enter

tunnel mpls traffic-eng bandwidth b

This indicates that the tunnel should use bandwidth from the global pool (the default).

To establish a sub-pool TE tunnel, you must enter configurations at three levels:

Device (router or switch router)

Physical interface

Tunnel interface

On the first two levels, you activate traffic engineering; on the third level—the tunnel interface—you 
establish the sub-pool tunnel. Therefore, it is only at the tunnel headend device that you need to 
configure all three levels. At the tunnel midpoints and tail, it is sufficient to configure the first two levels.

At this level, you tell the device (switch router) to use accelerated packet-forwarding (known as Cisco 
Express Forwarding or CEF), Multiprotocol Label Switching (MPLS), traffic-engineering tunneling, and 
the OSPF routing algorithm. This level is often called global configuration mode because the 
configuration is applied globally, to the entire device, rather than to a specific interface or routing 
instance. (These commands have not been modified from earlier releases of Cisco IOS.)

Enter the following commands:

Router(config)# ip cef 

Enables CEF, which accelerates the flow of packets through the 
device. 

Router(config)# mpls traffic-eng tunnels

Enables MPLS, and specifically its traffic engineering tunnel 
capability. 

Router(config)# router ospf 

Invokes the OSPF routing process for IP and puts the device into 
router configuration mode. Go to Steps 9 and 10.

Router(config-router)# mpls traffic-eng 

Specifies that the traffic engineering router identifier is the IP 
address associated with the loopback0 interface. 

Router(config-router)# mpls traffic-eng 

 num

Turns on MPLS traffic engineering for a particular OSPF area.