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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
switchport priority extend
switchport priority extend
Use the switchport priority extend interface configuration command on the switch stack or on a
standalone switch to set a port priority for the incoming untagged frames or the priority of frames
received by the IP phone connected to the specified port. Use the no form of this command to return to
the default setting.
switchport priority extend {cos value | trust}
no switchport priority extend
Syntax Description
Defaults The default port priority is set to a CoS value of 0 for untagged frames received on the port.
Command Modes Interface configuration
Command History
Usage Guidelines When voice VLAN is enabled, you can configure the switch to send the Cisco Discovery Protocol (CDP)
packets to instruct the IP phone how to send data packets from the device attached to the access port on
the Cisco IP Phone. You must enable CDP on the switch port connected to the Cisco IP Phone to send
the configuration to the Cisco IP Phone. (CDP is enabled by default globally and on all switch
interfaces.)
You should configure voice VLAN on switch access ports. You can configure a voice VLAN only on
Layer 2 ports.
Before you enable voice VLAN, we recommend that you enable quality of service (QoS) on the switch
by entering the mls qos global configuration command and configure the port trust state to trust by
entering the mls qos trust cos interface configuration command.
Examples This example shows how to configure the IP phone connected to the specified port to trust the received
IEEE 802.1p priority:
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# switchport priority extend trust
You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC
command.
cos value Set the IP phone port to override the IEEE 802.1p priority received from the PC or
the attached device with the specified class of service (CoS) value. The range is 0 to
7. Seven is the highest priority. The default is 0.
trust Set the IP phone port to trust the IEEE 802.1p priority received from the PC or the
attached device.
Release Modification
12.2(53)SE2 This command was introduced.
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