2-1
2 Voice VLAN Configuration
When configuring a voice VLAN, go to these sections for information you are interested in:
z Overview
z Configuring a Voice VLAN
z Displaying and Maintaining Voice VLAN
z Voice VLAN Configuration
Overview
As voice communication technologies grow more mature, voice devices are more and more widely
deployed, especially on broadband networks, where voice traffic and data traffic often co-exist. Usually,
compared to data traffic, voice traffic is given a higher transmission priority for the purpose of reducing
transmission delay and packet loss.
A voice VLAN is configured specially for voice traffic. After assigning the ports connecting to voice
devices to a voice VLAN, you can configure quality of service (QoS) parameters for the voice traffic,
thus improving transmission priority and ensuring voice quality.
Common voice devices include IP phones and integrated access devices (IADs). Only IP phones are
used in the voice VLAN configuration examples in this chapter.
OUI Addresses
A device determines whether a received packet is a voice packet by checking its source MAC address.
A packet whose source MAC address complies with the voice device Organizationally Unique Identifier
(OUI) address is regarded as voice traffic.
You can configure the OUI addresses in advance or use the default OUI addresses. Table 2-1
lists the
default OUI address for each vendor’s devices.
Table 2-1 The default OUI addresses of different vendors
Number OUI address Vendor
1 0001-e300-0000 Siemens phone
2 0003-6b00-0000 Cisco phone
3 0004-0d00-0000 Avaya phone
4 00d0-1e00-0000 Pingtel phone
5 0060-b900-0000 Philips/NEC phone
6 00e0-7500-0000 Polycom phone
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