Chapter 7 Configuring the Switch Ports
Configuring Voice Ports
7-18
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-05
Preparing a Port for a Cisco 7960 IP Phone Connection
Before you configure a Catalyst 3524-PWR XL port to carry IP voice traffic,
configure the port as an 802.1Q trunk and as a member of the voice VLAN
(VVID). See the “Configuring a Trunk Port” section on page 8-38 for
instructions.
Configuring a Port to Connect to a Cisco 7960 IP Phone
Because a Cisco 7960 IP Phone also supports connection to a PC or other device,
a port connecting a Catalyst 3524-PWR XL switch to a Cisco 7960 IP Phone can
carry mixed traffic. There are three configurations for a port connected to a
Cisco 7960 IP Phone:
• All traffic is transmitted according to the default COS priority of the port.
This is the default.
• Voice traffic is given a higher priority by the phone, and all traffic is in the
same VLAN.
• Voice and data traffic are carried on separate VLANs, and voice traffic always
has a CoS priority of 5.
Beginning in privileged EXEC mode, follow these steps to configure a port to
instruct the phone to give voice traffic a higher priority and to forward all traffic
through the 802.1Q native VLAN.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to be
configured.
Step 3
switchport voice vlan dot1p Instruct the switch to use 802.1p priority tagging for voice
traffic and to use VLAN 0 (default native VLAN) to carry
all traffic.
Step 4
end Return to privileged EXEC mode.
Step 5
show interface interface
switchport
Verify the port configuration.
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