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DiffServ-Aware Traffic Engineering Terminology
The following terminology applies to DiffServ-aware
traffic engineering:
- Bandwidth model—The bandwidth model determines the
values of the available bandwidth advertised by the interior gateway
protocols (IGPs).
- CAC—Call admission control (CAC) checks to ensure
there is adequate bandwidth on the path before the LSP is established.
If the bandwidth is insufficient, the LSP is not established and an
error is reported.
- Class type—A collection of traffic flows that is
treated equivalently in a differentiated services domain. A class
type maps to a queue and is much like a class-of-service (CoS) forwarding
class in concept. It is also known as a traffic class.
- Differentiated Services—Differentiated Services
make it possible to give different treatment to traffic based on the
experimental (EXP) bits in the MPLS header. Traffic must be marked
appropriately and CoS must be configured.
- Differentiated Services domain—The routers in a
network that have Differentiated Services enabled.
- DiffServ-aware traffic engineering—A type of constraint-based
routing. It can enforce different bandwidth constraints for different
classes of traffic. It can also do CAC on each traffic engineering
class when an LSP is established.
- Multiclass LSP—A multiclass LSP functions like a
standard LSP, but it also allows you to reserve bandwidth from multiple
class types. The EXP bits of the MPLS header are used to distinguish
between class types.
- MAM—The maximum allocation bandwidth constraint
model divides the available bandwidth between the different classes.
Sharing of bandwidth between the class types is not allowed.
- RDM—The Russian dolls bandwidth constraint model
makes efficient use of bandwidth by allowing the class types to share
bandwidth.
- Traffic engineering class—A paired class type and
priority.
- Traffic engineering class map—A map between the
class types, priorities, and traffic engineering classes. The traffic
engineering class mapping must be consistent across the Differentiated
Services domain.
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