Cisco Catalyst 3650 Series, Command Reference Manual

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Before you enable voice VLAN, we recommend that you enable quality of service (QoS) on the interface by
entering the
trust device cisco-phone interface configuration command. If you use the auto QoS feature,
these settings are automatically configured.
When you enter a VLAN ID, the IP phone forwards voice traffic in IEEE 802.1Q frames, tagged with the
specified VLAN ID. The device puts IEEE 802.1Q voice traffic in the voice VLAN.
When you select dot1p , none , or untagged , the device puts the indicated voice traffic in the access VLAN.
In all configurations, the voice traffic carries a Layer 2 IP precedence value. The default is 5 for voice traffic.
When you enable port security on an interface that is also configured with a voice VLAN, set the maximum
allowed secure addresses on the port to 2. When the port is connected to a Cisco IP phone, the IP phone
requires one MAC address. The Cisco IP phone address is learned on the voice VLAN, but not on the access
VLAN. If you connect a single PC to the Cisco IP phone, no additional MAC addresses are required. If you
connect more than one PC to the Cisco IP phone, you must configure enough secure addresses to allow one
for each PC and one for the Cisco IP phone.
If any type of port security is enabled on the access VLAN, dynamic port security is automatically enabled
on the voice VLAN.
You cannot configure static secure MAC addresses in the voice VLAN.
A voice-VLAN port cannot be a private-VLAN port.
The Port Fast feature is automatically enabled when voice VLAN is configured. When you disable voice
VLAN, the Port Fast feature is not automatically disabled.
Examples This example show how to first populate the VLAN database by associating a VLAN ID with a VLAN name,
and then configure the VLAN (using the name) on an interface, in the access mode: You can also verify your
configuration by entering the
show interfaces interface-id switchport
in privileged EXEC command and
examining information in the Voice VLAN: row.
Part 1 - Making the entry in the VLAN database:
Device# configure terminal
Device(config)# vlan 55
Device(config-vlan)# name test
Device(config-vlan)#
end
Device#
Part 2 - Checking the VLAN database:
Device# show vlan id 55
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
55 test active
VLAN Type
SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ------ ---- ----- ------ -------- --- -------- ------ ------
55 enet 100055 1500 - - - - - 0 0
Remote SPAN VLAN
----------------
Disabled
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
Part 3- Assigning VLAN to the interface by using the name of the VLAN:
Device#
configure terminal
Device(config)# interface gigabitethernet3/1/1
Device(config-if)# switchport mode access
Device(config-if)# switchport voice vlan name test
Device(config-if)#
end
Device#
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
366
switchport voice vlan