3Com 2928 - Baseline Plus Switch PWR, Руководство пользователя

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Voice VLAN Configuration
Overview
A voice VLAN is dedicated to 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.
A device determines whether a received packet is a voice packet by checking its source MAC address.
If the source MAC address of a received packet matches an organizationally unique identifier (OUI) in
the voice device OUI list (referred to as the OUI list in this document) maintained by the switch, the
packet is regarded as a voice packet.
You can add OUI addresses to the OUI list maintained by the device or use the default OUI list shown in
Table 1-1 for voice traffic identification.
Table 1-1
The default OUI list
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
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Generally, an OUI is the first 24 bits of a MAC address (in binary format). It is a globally unique
identifier assigned to a vendor by the IEEE. In this document, however, OUI addresses are used by
the system to determine whether received packets are voice packets and they are the results of the
AND operation of a MAC address and a mask. For details, see
Adding OUI Addresses to the OUI
List .
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You can remove default OUI addresses and if needed, add them to the OUI list after their removal.
Voice VLAN Assignment Modes
A port connected to a voice device, an IP phone for example, can be assigned to a voice VLAN in one of
these two modes: Automatic mode and manual mode. Ports on a same device can be assigned to
VLANs in different modes.