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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
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Chapter 55 Configuring a VoIP Network
Configuring VoIP on a Switch
You can configure the Cisco IP Phone 7960 access port (see Figure 55-5) to either trusted or untrusted
mode.
In untrusted mode, all the traffic in the 802.1Q or 802.1p frames that are received through the access port
is marked with a configured Layer 2 CoS value. The default Layer 2 CoS value is 0. The untrusted mode
is the default when the phone is connected to a Cisco LAN switch.
In trusted mode, all the traffic that is received through the access port passes through the phone switch
unchanged. The trusted mode is the default when the phone is not connected to a Cisco LAN switch.
The traffic in the frame types other than 802.1Q or 802.1p passes through the phone switch unchanged,
regardless of the access port trust state.
Figure 55-5 Configuring QoS on the IP Phone Ports
Configuring QoS in the Cisco IP Phone 7960
These sections describe how to configure QoS in the Cisco IP Phone 7960:
• Setting the Phone Access Port Trust Mode, page 55-32
• Setting the Phone Access Port CoS Value, page 55-33
• Verifying the Phone Access Port QoS Configuration, page 55-33
Setting the Phone Access Port Trust Mode
To set the phone access port trust mode, perform this task in privileged mode:
This example shows how to set the phone access port to the trusted mode:
Console> (enable) set port qos 3/7 trust-ext trusted
Port in the phone device connected to port 3/7 is configured to be trusted.
Console> (enable)
3-port
switch
P1
P3
P2
Access
port
Cisco IP Phone 7960
Workstation/PC
Catalyst switch
10/100 module
38204
Phone
ASIC
Task Command
Set the phone access port trust mode. set port qos mod/ports...trust-ext {trusted |
untrusted}
