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Routing & Switching · Advanced

MPLS Traffic Class (TC)

The 3-bit field in an MPLS label (formerly EXP) used to carry QoS markings across the core.

Definition

Ingress PEs typically copy IP Precedence into TC or set it by policy. Short pipe, pipe and uniform DiffServ tunneling modes determine whether customer markings are preserved or overwritten.

Example

set mpls experimental imposition 5

Exam tip

Three bits give only 8 classes, so DSCP values must be aggregated in the core.

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