R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

Number OUI address

Vendor

5 0060-B900-0000 Philips/NEC phone

6 00E0-7500-0000 Polycom phone

7 00E0-BB00-0000 3Com phone

In general, as the first 24 bits of a MAC address (in binary format), an OUI address is a globally unique

identifier that IEEE assigns to a vendor. In this document, however, OUI addresses are addresses that the

system uses to determine whether a received packet is a voice packet. They are the results of the AND

operation of the arguments mac-address and oui-mask in the voice vlan mac-address command.

Voice VLAN assignment modes

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

• Automatic mode—The system matches the source MAC address carried in packets sent when an IP

phone is powered on against the device's OUI addresses. If the system finds a match, it

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

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

remove a port from the voice VLAN if no packets are received from the port during the aging time.

The system automatically assigns ports to, or removes ports from, a voice VLAN. Automatic mode

is suitable for scenarios where PCs and IP phones connected in series access the network through

the device, and ports on the device transmit both voice traffic and data traffic at the same time, as

shown in Figure 8. W

hen the voice VLAN works correctly, if the system reboots, the system reassigns

ports in automatic voice VLAN assignment mode to the voice VLAN after reboot, ensuring that

existing voice connections can work correctly. In this case, voice traffic streams do not trigger port

assignment to the voice VLAN.

Figure 8 PCs and IP phones connected in series access the network

• Manual mode—You must manually assign an IP phone accessing port to a voice VLAN. Then, the

system matches the source MAC addresses carried in packets against the device's OUI addresses.

If the system finds a match, it issues ACL rules and configures the packet precedence. In this mode,

you must manually assign ports to, or remove ports from, a voice VLAN. Manual mode is suitable

for scenarios where only IP phones access the network through the device, and ports on the device

transmit only voice traffic, as shown in Figure 9. In this

mode, ports assigned to a voice VLAN

transmit voice traffic exclusively, which prevents data traffic from impacting the transmission of voice

traffic.