Chapter 17 Configuring Voice Vlan; Understanding Voice Vlan - Cisco IE-3000-8TC Software Configuration Manual

Configuring Voice VLAN
This chapter describes how to configure the voice VLAN feature on the IE 3000 switch. Voice VLAN is
referred to as an auxiliary VLAN in some Catalyst 6500 family switch documentation.
For complete syntax and usage information for the commands used in this chapter, see the command
Note
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. When the switch
is connected to a Cisco 7960 IP Phone, the phone sends voice traffic with Layer 3 IP precedence and
Layer 2 class of service (CoS) values, which are both set to 5 by default. Because the sound quality of
an IP phone call can deteriorate if the data is unevenly sent, the switch supports quality of service (QoS)
based on IEEE 802.1p 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
IEEE 802.1p priority. You can configure the switch to trust or override the traffic priority assigned by a
Cisco IP Phone.
The Cisco IP Phone contains an integrated three-port 10/100 switch as shown in
provide dedicated connections to these devices:
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OL-13018-03
Understanding Voice VLAN, page 17-1
Configuring Voice VLAN, page 17-3
Displaying Voice VLAN, page 17-6
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 (access port) connects to a PC or other device.
C H A P T E R
Chapter 36, "Configuring QoS."
Cisco IE 3000 Switch Software Configuration Guide
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Figure 17-1. The ports
17-1