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Routing & Switching · Foundational

Voice VLAN

A separate VLAN on an access port for IP phone traffic, which the phone tags while passing PC traffic untagged.

Definition

The switch advertises the voice VLAN ID to the phone through CDP or LLDP-MED. Voice frames carry 802.1Q tags with CoS 5, and the switch can trust or extend trust to the phone. This separates voice for QoS and security while using one cable.

Example

switchport voice vlan 110

Exam tip

A port with a voice VLAN is still an access port, not a trunk, on exams.

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