16-6
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 16 Configuring Cisco IP Phone Support
Configuring Cisco IP Phone Support
Configuring Cisco IP Phone Support
These sections describe how to configure Cisco IP phone support:
• Configuring Voice Traffic Support, page 16-6
• Configuring Data Traffic Support, page 16-7
• Configuring Inline Power Support, page 16-8
Note Voice VLANs are referred to as auxiliary VLANs in the Catalyst software publications.
Configuring Voice Traffic Support
To configure the way in which the Cisco IP phone transmits voice traffic, perform this task:
When configuring the way in which the Cisco IP phone transmits voice traffic, note the following
information:
• Enter a voice VLAN ID to send CDP packets that configure the Cisco IP phone to transmit voice
traffic in 802.1Q frames, tagged with the voice VLAN ID and a Layer 2 CoS value (the default is
5). Valid VLAN IDs are from 1 to 4094. The router puts the 802.1Q voice traffic into the voice
VLAN.
• Enter the dot1p keyword to send CDP packets that configure the Cisco IP phone to transmit voice
traffic in 802.1p frames, tagged with VLAN ID 0 and a Layer 2 CoS value (the default is 5 for voice
traffic and 3 for voice control traffic). The router puts the 802.1p voice traffic into the access VLAN.
• Enter the untagged keyword to send CDP packets that configure the Cisco IP phone to transmit
untagged voice traffic. The router puts the untagged voice traffic into the access VLAN.
• Enter the none keyword to allow the Cisco IP phone to use its own configuration and transmit
untagged voice traffic. The router puts the untagged voice traffic into the access VLAN.
• In all configurations, the voice traffic carries a Layer 3 IP precedence value (the default is 5).
• Refer to Chapter 41, “Configuring PFC QoS,” for information about how to configure QoS.
• Refer to the “Configuring a LAN Interface as a Layer 2 Access Port” section on page 10-14 for
information about how to configure the port as a Layer 2 access port and configure the
access VLAN.
Command Purpose
Step 1
Router(config)# interface fastethernet
slot/port
Selects the port to configure.
Step 2
Router(config-if)# switchport voice vlan
{
voice_vlan_ID
| dot1p | none | untagged}
Configures the way in which the Cisco IP phone
transmits voice traffic.
Router(config-if)# no switchport voice vlan
Clears the configuration.
Step 3
Router(config)# end
Exits configuration mode.
Step 4
Router# show interfaces fastethernet
slot/port
switchport
Router# show running-config interface
fastethernet
slot/port
Verifies the configuration.
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