Cisco Systems 3130 User Manual
14-5
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 14 Configuring Voice VLAN
Configuring Voice VLAN
Configuring Cisco IP Phone Voice Traffic
You can configure a port connected to the Cisco IP Phone to send CDP packets to the phone to configure
the way in which the phone sends voice traffic. The phone can carry voice traffic in IEEE 802.1Q frames
for a specified voice VLAN with a Layer 2 CoS value. It can use IEEE 802.1p priority tagging to give
voice traffic a higher priority and forward all voice traffic through the native (access) VLAN. The Cisco
IP Phone can also send untagged voice traffic or use its own configuration to send voice traffic in the
access VLAN. In all configurations, the voice traffic carries a Layer 3 IP precedence value (the default
is 5).
the way in which the phone sends voice traffic. The phone can carry voice traffic in IEEE 802.1Q frames
for a specified voice VLAN with a Layer 2 CoS value. It can use IEEE 802.1p priority tagging to give
voice traffic a higher priority and forward all voice traffic through the native (access) VLAN. The Cisco
IP Phone can also send untagged voice traffic or use its own configuration to send voice traffic in the
access VLAN. In all configurations, the voice traffic carries a Layer 3 IP precedence value (the default
is 5).
Beginning in privileged EXEC mode, follow these steps to configure voice traffic on a port:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
interface interface-id
Specify the interface connected to the phone, and enter interface
configuration mode.
configuration mode.
Step 3
mls qos trust cos
Configure the interface to classify incoming traffic packets by using the
packet CoS value. For untagged packets, the port default CoS value is used.
packet CoS value. For untagged packets, the port default CoS value is used.
Note
Before configuring the port trust state, you must first globally enable
QoS by using the mls qos global configuration command.
QoS by using the mls qos global configuration command.
Step 4
switchport voice {detect
cisco-phone [full-duplex] | vlan
{vlan-id | dot1p | none | untagged}}
cisco-phone [full-duplex] | vlan
{vlan-id | dot1p | none | untagged}}
Configure how the Cisco IP Phone carries voice traffic:
•
detect—Configure the interface to detect and recognize a Cisco IP
phone.
phone.
•
cisco-phone—When you initially implement the switchport voice detect
command, this is the only allowed option. The default is no switchport
voice detect cisco-phone [full-duplex].
command, this is the only allowed option. The default is no switchport
voice detect cisco-phone [full-duplex].
•
full-duplex—(Optional) Configure the switch to only accept a
full-duplex Cisco IP phone.
full-duplex Cisco IP phone.
•
vlan-id—Configure the phone to forward all voice traffic through the
specified VLAN. By default, the Cisco IP Phone forwards the voice
traffic with an IEEE 802.1Q priority of 5. Valid VLAN IDs are 1 to
4094.
specified VLAN. By default, the Cisco IP Phone forwards the voice
traffic with an IEEE 802.1Q priority of 5. Valid VLAN IDs are 1 to
4094.
•
dot1p—Configure the phone to use IEEE 802.1p priority tagging for
voice traffic and to use the default native VLAN (VLAN 0) to carry all
traffic. By default, the Cisco IP Phone forwards the voice traffic with an
IEEE 802.1p priority of 5.
voice traffic and to use the default native VLAN (VLAN 0) to carry all
traffic. By default, the Cisco IP Phone forwards the voice traffic with an
IEEE 802.1p priority of 5.
•
none—Allow the phone to use its own configuration to send untagged
voice traffic.
voice traffic.
•
untagged—Configure the phone to send untagged voice traffic.
Step 5
end
Return to privileged EXEC mode.
Step 6
show interfaces interface-id
switchport or
switchport or
show running-config interface
interface-id
interface-id
Verify your voice VLAN entries.
Verify your QoS and voice VLAN entries.
Step 7
copy running-config startup-config
(Optional) Save your entries in the configuration file.