Cisco Cisco IOS Software Release 12.0(22)S

Build the higher-revenue generating “strict-commitment” QoS services, without over-provisioning

Offer virtual IP leased-line, Layer 2 service emulation, and point-to-point guaranteed bandwidth 
services including voice-trunking

Enjoy the scalability properties offered by MPLS

The DS-TE feature is related to OSPF, IS-IS, RSVP (Resource reSerVation Protocol), QoS, and MPLS 
traffic engineering. Cisco documentation for all of these features is listed in the next section.

Your network must support the following Cisco IOS features in order to support guaranteed bandwidth 
services based on DiffServ-aware Traffic Engineering:

MPLS

IP Cisco Express Forwarding

OSPF or ISIS

RSVP-TE

QoS

This section lists the minimum set of commands you need to implement the DiffServ-aware Traffic 
Engineering feature—in other words, to establish a tunnel that reserves bandwidth from the sub-pool.

The subsequent 

“Configuration Examples” section on page 8

 presents these same commands in context and 

shows how, by combining them with QoS commands, you can build guaranteed bandwidth services.

DS-TE commands were developed from the existing command set that configures MPLS traffic engineering. 
The only difference introduced to create DS-TE was the expansion of two commands:

ip rsvp bandwidth was expanded to configure the size of the sub-pool on every link.

tunnel mpls traffic-eng bandwidth was expanded to enable a TE tunnel to reserve bandwidth from the 
sub-pool.

The old command was

ip rsvp bandwidth x y

where x = the size of the only possible pool, and y = the size of a single traffic flow (ignored by traffic 
engineering)