Default Voice Vlan Configuration; How To Configure Voice Vlan; Configuring Cisco Ip Phone Voice Traffic - Cisco Catalyst 2960 series Configuration Manual

Configuring Voice VLANs
• Voice VLAN ports can also be these port types:

Default Voice VLAN Configuration

The voice VLAN feature is disabled by default.
When the voice VLAN feature is enabled, all untagged traffic is sent according to the default CoS priority of
the port.
The CoS value is not trusted for IEEE 802.1p or IEEE 802.1Q tagged traffic.

How to Configure Voice VLAN

Configuring Cisco IP Phone Voice Traffic

You can configure a port connected to the Cisco IP Phone to send CDP packets to the phone to configure the
way in which the phone sends voice traffic. The phone can carry voice traffic in IEEE 802.1Q frames for a
specified voice VLAN with a Layer 2 CoS value. It can use IEEE 802.1p priority tagging to give voice traffic
a higher priority and forward all voice traffic through the native (access) VLAN. The Cisco IP Phone can also
send untagged voice traffic or use its own configuration to send voice traffic in the access VLAN. In all
configurations, the voice traffic carries a Layer 3 IP precedence value (the default is 5).
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◦ Dynamic access port.
◦ IEEE 802.1x authenticated port.
If you enable IEEE 802.1x on an access port on which a voice VLAN is configured and
Note
to which a Cisco IP Phone is connected, the phone loses connectivity to the switch for
up to 30 seconds.
◦ Protected port.
◦ A source or destination port for a SPAN or RSPAN session.
◦ Secure port.
When you enable port security on an interface that is also configured with a voice VLAN,
Note
you must set the maximum allowed secure addresses on the port to two plus the maximum
number of secure addresses allowed on the access VLAN. When the port is connected
to a Cisco IP Phone, the phone requires up to two MAC addresses. The phone address
is learned on the voice VLAN and might also be learned on the access VLAN. Connecting
a PC to the phone requires additional MAC addresses.
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
Default Voice VLAN Configuration
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