3-13 Voice VLAN ConfigurationWhen configuring a voice VLAN, go to these sections for information you are interested in:z Overviewz Configuring a Voice VLANz Displaying and Maintaining Voice VLANz Voice VLAN ConfigurationOverviewAs voice communication technologies grow more mature, voice devices are more and more widelydeployed, 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 reducingtransmission delay and packet loss.A voice VLAN is configured specially for voice traffic. After assigning the ports connecting to voicedevices 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 areused in the voice VLAN configuration examples in this chapter.OUI AddressesA 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 3-1 lists thedefault OUI address for each vendor’s devices.Table 3-1 The default OUI addresses of different vendorsNumber OUI address Vendor1 0001-e300-0000 Siemens phone2 0003-6b00-0000 Cisco phone3 0004-0d00-0000 Avaya phone4 00d0-1e00-0000 Pingtel phone5 0060-b900-0000 Philips/NEC phone6 00e0-7500-0000 Polycom phone
