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Voice VLAN configuration
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 especially for voice traffic. After assigning the ports connecting to voice
devices to a voice VLAN, the system automatically configures QoS parameters for voice traffic, improving
the transmission priority of voice traffic and ensuring voice quality.
Common voice devices include IP phones and 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’s OUI address is regarded as voice
traffic.
Configure the OUI addresses of a device in advance or use the default OUI addresses. Table 16 list
s the
default OUI address for each vendor’s devices.
Table 16 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
7 00e0-bb00-0000 3Com phone
In general, as the first 24 bits of a MAC address (in binary format), an OUI address is a globally unique
identifier assigned to a vendor by IEEE. However, OUI addresses mentioned in this document are different
from those in common sense. OUI addresses in this document are used by the system to determine
whether a received packet is a voice packet. They are the results of the AND operation of the two
arguments mac-address and oui-mask in the voice vlan mac-address command.
Remove the default OUI address of a device manually, and then add new ones manually.
Voice VLAN assignment modes
A port can be assigned to a voice VLAN in one of the following modes:
• In automatic mode, the system matches the source MAC address carried in the untagged packets
sent when an IP phone is powered on against the device’s OUI addresses. If a match is found, the
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