When implementing MPLS DS-TE on Cisco IOS XR routers, all aggregate Cisco MPLS TE traffic is
mapped to which class type by default?

A.
class-type 0 (bandwidth global pool)

B.
class-type 1 (bandwidth subpool)

C.
class-type 2 (bandwidth priority)

D.
class type class-default (bandwidth best-effort)

Explanation:
Differentiated Services Traffic Engineering
MPLS Differentiated Services (Diff-Serv) Aware Traffic Engineering (DS-TE) is an extension of the
regular
MPLS-TE feature. Regular traffic engineering does not provide bandwidth guarantees to different
traffic classes. A single bandwidth constraint is used in regular TE that is shared by all traffic. To
support various classes of service (CoS), users can configure multiple bandwidth constraints. These
bandwidth constraints can be treated differently based on the requirement for the traffic class using
that constraint.
MPLS diff-serv traffic engineering provides the ability to configure multiple bandwidth constraints on
an MPLSenabled interface. Available bandwidths from all configured bandwidth constraints are
advertised using IGP.TE tunnel is configured with bandwidth value and class-type requirements. Path calculation and
admission control take the bandwidth and class-type into consideration. RSVP is used to signal the
TE tunnel with bandwidth and class-type requirements.
Diff-Serv TE can be deployed with either Russian Doll Model (RDM) or Maximum Allocation Model
(MAM) for bandwidth calculations.