3com 2928 Betriebsanweisung

 

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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 

 for voice traffic identification.  

The default OUI list 

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 

 

z

 

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 

. 

z

 

You can remove default OUI addresses and if needed, add them to the OUI list after their removal.  

 

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.