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Software Configuration Guide—Release 12.2(25)SG
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Chapter 28 Configuring Voice Interfaces
Configuring a Port to Connect to a Cisco 7960 IP Phone
Figure 28-1 Cisco 7960 IP Phone Connected to a Catalyst 4500 Series Switch
Configuring a Port to Connect to a Cisco 7960 IP Phone
Because a Cisco 7960 IP phone also supports connection to a PC or another device, an interface
connecting a Catalyst 4500 series switch to a Cisco 7960 IP phone can carry a mix of voice and data
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 (CoS priority is always 5), and all traffic is in
the same VLAN.
• Voice and data traffic are carried on separate VLANs.
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, perform this task:
Configuring Voice Ports for Voice and Data Traffic
Because voice and data traffic can travel through the same voice port, you should specify a different
VLAN for each type of traffic. You can configure a switch port to forward voice and data traffic on
different VLANs.
Note See the “Using 802.1X with Voice VLAN Ports” section on page 29-12 for information about
using 802.1X with voice VLANs.
IP Phone
Catalyst 4500 Series Switch
PC
105247
IP
Command Purpose
Step 1
Switch# configure terminal
Enters configuration mode.
Step 2
Switch(config)# interface {fastethernet |
gigabitethernet}
slot/port
Specifies the interface to configure.
Step 3
Switch(config-if)# switchport voice vlan dot1p
Instructs the switch to use 802.1p priority tagging for voice
traffic and to use VLAN 1 (default native VLAN) to carry
all traffic.
Step 4
Switch(config-if)# end
Returns to privileged EXEC mode.
Step 5
Switch# show interface {fastethernet |
gigabitethernet}
slot/port
switchport
Verifies the port configuration.
