Cisco Cisco IOS Software Release 12.0(22)S
MPLS Traffic Engineering—DiffServ Aware
Prerequisites
3
Cisco IOS Release: Multiple releases (see the Feature History table)
•
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
services including voice-trunking
•
Enjoy the scalability properties offered by MPLS
Related Features and Technologies
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.
traffic engineering. Cisco documentation for all of these features is listed in the next section.
Prerequisites
Your network must support the following Cisco IOS features in order to support guaranteed bandwidth
services based on DiffServ-aware Traffic Engineering:
services based on DiffServ-aware Traffic Engineering:
•
MPLS
•
IP Cisco Express Forwarding
•
OSPF or ISIS
•
RSVP-TE
•
QoS
Configuration Tasks
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.
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.
Central Commands for DS-TE
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:
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.
sub-pool.
The ip rsvp bandwidth command
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)
engineering)