Chapter 15 Configuring Voice Vlan; Understanding Voice Vlan - Cisco Catalyst 2950 Software Configuration Manual

Configuring Voice VLAN
This chapter describes how to configure the voice VLAN feature on your switch. Voice VLAN is referred
to as an auxiliary VLAN in the Catalyst 6000 family switch documentation.
For complete syntax and usage information for the commands used in this chapter, refer to the
Note
Catalyst 2950 Desktop Switch Command Reference for this release.
This chapter consists of these sections:
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Understanding Voice VLAN

The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. The switch can
connect to a Cisco 7960 IP Phone and carry IP voice traffic. Because the sound quality of an IP phone
call can deteriorate if the data is unevenly transmitted, the switch supports quality of service ( QoS) based
on IEEE 802.1P class of service (CoS). QoS uses classification and scheduling to send network traffic from
the switch in a predictable manner. For more information on QoS, see
The Cisco 7960 IP Phone is a configurable device, and you can configure it to forward traffic with an
802.1P priority. You can configure the switch to trust or override the traffic priority assigned by a
Cisco 7960 IP Phone.
The Cisco 7960 IP Phone contains an integrated three-port 10/100 switch. The ports are dedicated
connections to these devices:
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78-11380-04
Understanding Voice VLAN, page 15-1
Configuring Voice VLAN, page 15-2
Displaying Voice VLAN, page 15-6
Port 1 connects to the switch or other voice-over-IP (VoIP) device.
Port 2 is an internal 10/100 interface that carries the IP phone traffic.
Port 3 connects to a PC or other device.
C H A P T E R
Catalyst 2950 Desktop Switch Software Configuration Guide
15
Chapter 24, "Configuring QoS."
15-1