Operation Manual – Voice VLAN
H3C S3100 Series Ethernet Switches Chapter 1 Voice VLAN Configuration
1-4
 Note:
An OUI address is a globally unique identifier assigned to a vendor by IEEE. You can
determine which vendor a device belongs to according to the OUI address which forms
the first 24 bits of a MAC address. S3100 series Ethernet switches support OUI
address mask configuration. You can adjust the matching depth of MAC address by
setting different OUI address masks.
The following table lists the five default OUI addresses on S3100 series switches.
Table 1-1 Default OUI addresses pre-defined on the switch
Number OUI address Vendor
1 0003-6b00-0000 Cisco phones
2 000f-e200-0000 H3C Aolynk phones
3 00d0-1e00-0000 Pingtel phones
4 00e0-7500-0000 Polycom phones
5 00e0-bb00-0000 3Com phones
1.1.3 Setting the Voice Traffic Transmission Priority
In order to improve transmission quality of voice traffic, the switch by default re-marks
the priority of the traffic in the voice VLAN as follows:
z Set the CoS (802.1p) priority to 6.
z Set the DSCP value to 46.
1.1.4 Configuring Voice VLAN Assignment Mode of a Port
A port can work in automatic voice VLAN assignment mode or manual voice VLAN
assignment mode. You can configure the voice VLAN assignment mode for a port
according to data traffic passing through the port.
I. Processing mode of untagged packets sent by IP voice devices
z Automatic voice VLAN assignment mode. An S3100 Ethernet switch automatically
adds a port connecting an IP voice device to the voice VLAN by learning the
source MAC address in the untagged packet sent by the IP voice device when it is
powered on. The voice VLAN uses the aging mechanism to maintain the number
of ports in the voice VLAN. When the aging timer expires, the ports whose OUI
addresses are not updated (that is, no voice traffic passes) will be removed from
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