3com 5500-ei pwr Instruccion De Instalación

 

1-7 

Table 1-4 How a packet is handled when the voice VLAN is operating in different modes 

Untagged packet 

Packet carrying the voice 
VLAN tag 

If the source MAC address of the packet 
matches the OUI list, the packet is transmitted in 
the voice VLAN. Otherwise, the packet is 
dropped. 

Security 

Packet carrying any other 
VLAN tag 

The packet is forwarded or dropped based on 
whether the receiving port is assigned to the 
carried VLAN. The processing method is 
irrelevant to the voice VLAN mode (security or 
normal).  

Untagged packet 

Packet carrying the voice 
VLAN tag 

The source MAC address of the packet is not 
checked. All such packets can be transmitted in 
the voice VLAN. 

Normal 

Packet carrying any other 
VLAN tag 

The packet is forwarded or dropped based on 
whether the port is assigned to the carried VLAN. 
The processing method is irrelevant to the voice 
VLAN mode (security or normal).  

 

z 

Create the corresponding VLAN before configuring a voice VLAN. 

z 

VLAN 1 (the default VLAN) cannot be configured as a voice VLAN. 

In case a connected voice device sends VLAN-tagged packets, ensure that the voice VLAN created on 

the switch is consistent with the VLAN corresponding to the VLAN tag carried in voice packets. 

Otherwise, the switch will not be able to properly receive voice packets. 

 

Follow these steps to configure a voice VLAN to operate in automatic voice VLAN assignment mode: 

Enter system view 

— 

Set an OUI address that can be 
identified by the voice VLAN 

voice vlan mac-address oui 
mask oui-mask [ description 
text ] 

Optional 

By default, the switch 
determines the voice traffic 
according to the default OUI 
address. 

Enable the voice VLAN security 
mode 

Optional 

By default, the voice VLAN 
security mode is enabled.