Supported Platforms
DiffServ-Aware Traffic Engineered LSPs Overview
A DiffServ-aware traffic engineered LSP is an LSP configured with a bandwidth reservation for a specific class type. This LSP can carry traffic for a single class type. On the packets, the class type is specified by the EXP bits (also known as the class-of-service bits) and the per-hop behavior (PHB) associated with the EXP bits. The mapping between the EXP bits and the PHB is static, rather than being signaled in RSVP.
The class type must be configured consistently across the Differentiated Services domain, meaning the class type configuration must be consistent from router to router in the network. You can unambiguously map a class type to a queue. On each node router, the class-of-service queue configuration for an interface translates to the available bandwidth for a particular class type on that link.
For more information about topics related to LSPs and DiffServ-aware traffic engineering, see the following:
- For forwarding classes and class of service, see the Junos OS Class of Service Configuration Guide.
- For EXP bits, see Label Allocation.
- For differentiated services, see RFC 3270, Multi-Protocol Label Switching (MPLS) Support of Differentiated Services.
- For information about how the IGPs and RSVP have been modified to support Differentiated Services-aware MPLS traffic engineering, see RFC 4124, Protocol Extensions for Support of Differentiated-Service-Aware MPLS Traffic Engineering.
