Cisco Systems 3130 User Manual

This example shows how to configure a port connected to a Cisco IP Phone to use the CoS value to 
classify incoming traffic, to use IEEE 802.1p priority tagging for voice traffic, and to use 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.

This example shows how to enable switchport voice detect on a Cisco IP Phone:

Switch# configure terminal 

Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# interface gigabitethernet 1/0/1

Switch(config-if)# switchport voice?

detect           detection enhancement keyword

vlan             VLAN for voice traffic

Switch(config-if)# switchport voice detect?

cisco-phone      Cisco IP Phone

Switch(config-if)# switchport voice detect cisco-phone?

full-duplex      Cisco IP Phone

Switch(config-if)# switchport voice detect cisco-phone full-duplex

full-duplex      full duplex keyword

Switch(config-if)# end 

This example shows how to disable switchport voice detect on a Cisco IP Phone:

Switch# configure terminal 

Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# interface gigabitethernet 1/0/1

Switch(config-if)# no switchport voice detect cisco-phone

Switch(config-if)# no switchport voice detect cisco-phone full-duplex

You can connect a PC or other data device to a Cisco IP Phone port. To process tagged data traffic (in 
IEEE 802.1Q or IEEE 802.1p frames), you can configure the switch to send CDP packets to instruct the 
phone how to send data packets from the device attached to the access port on the Cisco IP Phone. The 
PC can generate packets with an assigned CoS value. You can configure the phone to not change (trust) 
or to override (not trust) the priority of frames arriving on the phone port from connected devices.

Beginning in privileged EXEC mode, follow these steps to set the priority of data traffic received from 
the nonvoice port on the Cisco IP Phone:

Enter global configuration mode.

interface interface-id

Specify the interface connected to the Cisco IP Phone, and enter interface 
configuration mode.