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Catalyst 3750 Switch Software Configuration Guide
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Chapter 16 Configuring Voice VLAN
Configuring Voice VLAN
Beginning in privileged EXEC mode, follow these steps to configure voice traffic on a port:
This example shows how to configure a port connected to an IP phone to use the CoS value to classify
ingress traffic, to use 802.1p priority tagging for voice traffic, and to use and the default native VLAN
(VLAN 0) to carry all traffic:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# mls qos trust cos
Switch(config-if)# switchport voice vlan dot1p
Switch(config-if)# end
To return the port to its default setting, use the no switchport voice vlan interface configuration
command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface connected to
the IP phone.
Step 3
mls qos trust cos Configure the interface to classify ingress traffic packets by using the packet
CoS value. For untagged packets, the port default CoS value is used.
Note Before configuring the port trust state, you must first globally enable
QoS by using the mls qos global configuration command.
Step 4
switchport voice vlan {vlan-id |
dot1p | none | untagged}
Configure how the Cisco IP Phone carries voice traffic:
• vlan-id—Configure the Cisco IP Phone to forward all voice traffic
through the specified VLAN. By default, the Cisco IP Phone forwards
the voice traffic with an 802.1Q priority of 5. Valid VLAN IDs are from
1 to 4094.
• dot1p—Configure the Cisco IP Phone to use 802.1p priority tagging for
voice traffic and to use the default native VLAN (VLAN 0) to carry all
traffic. By default, the Cisco IP Phone forwards the voice traffic with an
802.1p priority of 5.
• none—Allow the IP phone to use its own configuration to send untagged
voice traffic.
• untagged—Configure the phone to send untagged voice traffic.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces interface-id
switchport or
show running-config interface
interface-id
Verify your voice VLAN entries.
Verify your QoS and voice VLAN entries.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
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