H3C Technologies H3C S7500E Series Switches - Manual (Page 95)

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DiffServ-Aware TE
Diff-Serv is a model that provides differentiated QoS guarantees based on class of service.
MPLS TE is a traffic engineering solution that focuses on optimizing network resources allocation.
DiffServ-aware TE (DS-TE) combines them to optimize network resources allocation at a per-service
class level. For traffic trunks which are distinguished by class of service, this means varied bandwidth
constraints.
Essentially, what DS-TE does is to map traffic trunks with LSPs, making each traffic trunk traverse the
constraints-compliant path.
DS-TE involves two concepts:
z
Class type (CT): The set of traffic trunks crossing a link that is governed by a specific set of
Bandwidth constraints. CT is used for purposes of link bandwidth allocation, constraint based
routing, and admission control. A given traffic trunk belongs to the same CT on all links.
z
Bandwidth constraints (BCs): Different BC models can be created to control CTs. A BC model is
broken down into maximum number of BCs (MaxBC), and mappings between BCs and CTs.
Currently, DiffServ-Aware TE is not supported.
Protocols and Standards
z RFC 2702 Requirements for Traffic Engineering Over MPLS
z RFC 3212 Constraint-Based LSP Setup using LDP
z RFC 2205 Resource ReSerVation Protocol
z RFC 3209 RSVP-TE: Extensions to RSVP for LSP Tunnels
z RFC 2961 RSVP Refresh Overhead Reduction Extensions
z RFC 3564 Requirements for Support of Differentiated Service-aware MPLS Traffic Engineering
MPLS TE Configuration Task List
Complete the following tasks to configure MPLS TE:
Task Remarks
Configuring MPLS TE Basic Capabilities Required
Creating MPLS TE Tunnel over Static CR-LSP Configuring an
MPLS TE
tunnel
Configuring MPLS TE Tunnel with Dynamic Signaling Protocol
Required
Use either approach
Configuring RSVP-TE Advanced Features Optional
Tuning CR-LSP Setup Optional