Cisco Systems 3560 사용자 설명서

 shows one way to connect a Cisco 7960 IP Phone.

You can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic 
and another VLAN for data traffic from a device attached to the phone. You can configure access ports 
on the switch to send Cisco Discovery Protocol (CDP) packets that instruct an attached phone to send 
voice traffic to the switch in any of these ways:

In the voice VLAN tagged with a Layer 2 CoS priority value

In the access VLAN tagged with a Layer 2 CoS priority value

In the access VLAN, untagged (no Layer 2 CoS priority value)

In all configurations, the voice traffic carries a Layer 3 IP precedence value (the default is 5 for voice 
traffic and 3 for voice control traffic). 

The switch can also process tagged data traffic (traffic in IEEE 802.1Q or IEEE 802.1p frame types) 
from the device attached to the access port on the Cisco IP Phone (see 

). You can configure 

Layer 2 access ports on the switch to send CDP packets that instruct the attached phone to configure the 
phone access port in one of these modes:

In trusted mode, all traffic received through the access port on the Cisco IP Phone passes through 
the phone unchanged.

In untrusted mode, all traffic in IEEE 802.1Q or IEEE 802.1p frames received through the access 
port on the Cisco IP Phone receive a configured Layer 2 CoS value. The default Layer 2 CoS value 
is 0. Untrusted mode is the default.

3-port

switch

P1

P3

P2

Access
port

Cisco IP Phone 7960

PC

101351

Phone

ASIC