switchport priority extend
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 switchport priority extend command in interface configuration mode.
To return to the default setting, use the no form of this command.
switchport priority extend {cos value| trust}
no switchport priority extend
Syntax Description
Sets 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.
cos value
Sets the IP phone port to trust the IEEE 802.1p priority received from the PC or the
attached device.
trust
Command Default
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
ModificationRelease
This command was introduced.Cisco IOS XE 3.3SECisco IOS XE 3.3SE
Usage Guidelines
When voice VLAN is enabled, you can configure the device 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 device 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 device interfaces.)
You should configure voice VLAN on device 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 interface by
entering the trust device cisco-phone interface configuration command. If you use the auto QoS feature,
these settings are automatically configured.
Examples
This example shows how to configure the IP phone connected to the specified port to trust the received IEEE
802.1p priority:
Device(config)# interface gigabitethernet1/0/2
Device(config-if)# switchport priority extend trust
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
1048
switchport priority extend
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