Cisco Cisco IOS Software Release 12.2(33)SRE

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This guide presents extensions made to Multiprotocol Label Switching Traffic Engineering (MPLS TE) 
that make it DiffServ aware. Specifically, the bandwidth reservable on each link for constraint-based 
routing (CBR) purposes can now be managed through at least two bandwidth pools: a global pool (also 
called BC0) and a sub-pool (also called BC1). The sub-pool can be limited to a smaller portion of the 
link bandwidth. Tunnels using the sub-pool bandwidth can then be used in conjunction with MPLS 
Quality of Service (QoS) mechanisms to deliver guaranteed bandwidth services end-to-end across the 
network. 

Beginning with Cisco IOS Release 12.2(33)SRB, DS-TE has been augmented to conform to IETF 
standards that were developed after the initial creation of Cisco DS-TE. Now both the traditional and the 
IETF versions of DS-TE can be run on your network; the new releases are backwards compatible.

DS-TE feature introduced.

Support was added for Cisco Series 7500(VIP) platform.

Support was added for IS-IS Interior Gateway Protocol.

Support was added for guaranteed bandwidth service directed to many destination 
prefixes (for example, guaranteed bandwidth service destined to an autonomous 
system or to a BGP community).

Feature was implemented in Cisco IOS Release 12.0(22)S.

Feature was integrated into Cisco IOS Release 12.2(14)S.

Feature was implemented in Cisco IOS Release 12.2(18)S.

Feature was implemented in Cisco IOS Release 12.2(18)SXD.

Feature was implemented in Cisco IOS Release 12.2(28)SB.

Feature was augmented to include the new IETF-Standard functionality of DS-TE, 
as described in RFCs 3270, 4124, 4125, and 4127.