3com S7906E 설치 설명서

 

4-2 

z 

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. OUI addresses mentioned in this document, 

however, 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. 

z 

You can remove the default OUI address of a device manually and then add new ones manually.  

 

A port can be assigned to a voice VLAN in one of the following two modes:  

z 

In automatic mode, the system matches the source MAC addresses in the untagged packets sent 

when the IP phone is powered on against the OUI addresses. If a match is found, the system 

automatically assigns the port to the voice VLAN, issues ACL rules and configures the packet 

precedence. You can configure voice VLAN aging time on the device. The system will remove a 

port from the voice VLAN if no packet is received from the port after the aging time expires. 

Assigning/removing ports to/from a voice VLAN are automatically performed by the system. 

z 

In manual mode, you should assign an IP phone connecting port to a voice VLAN manually. Then, 

the system matches the source MAC addresses in the packets against the OUI addresses. If a 

match is found, the system issues ACL rules and configures the packet precedence. In this mode, 

assigning/removing ports to/from a voice VLAN are performed manually. 

z 

Both modes forward tagged packets according to their tags. 

The following table lists the co-relation between the port voice VLAN mode, the voice traffic type of an IP 

phone, and the port link type. 

Table 4-2 Co-relation 

Access: not supported 

Trunk: supported if the default VLAN of the connecting 
port exists and is not the voice VLAN and the connecting 
port belongs to the default VLAN  

Tagged voice traffic 

Hybrid: supported if the default VLAN of the connecting 
port exists and is not the voice VLAN 

Automatic mode 

Untagged voice traffic

Access, Trunk, hybrid: not supported