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Routing & Switching · Foundational

Expedited Forwarding (EF)

A DiffServ PHB (DSCP 46) for low-loss, low-latency, low-jitter traffic such as voice, usually served by a priority queue.

Definition

EF traffic should be admitted only up to a policed rate so it cannot starve other classes. Cisco's LLQ priority command polices the EF class during congestion.

Example

class VOICE / priority percent 20

Exam tip

Voice bearer = EF 46; voice signaling = CS3 24. Do not mix them up.

Related terms