Voice Vlan Configuration; Overview; Methods Of Identifying Ip Phones; Oui Addresses - H3C S5120-SI series Configuration Manual

Voice VLAN configuration

This chapter includes these sections:

Overview

•
Configuring a voice VLAN
•
Displaying and maintaining voice VLAN
•
• Voice VLAN configuration examples
Overview
As voice communication technologies grow more mature, voice devices are more and more widely
deployed, especially on broadband networks, where voice traffic and data traffic often co-exist. Usually,
compared to data traffic, voice traffic is given a higher transmission priority for the purpose of reducing
transmission delay and packet loss.
A voice VLAN is configured especially for voice traffic. After assigning the ports connecting to voice
devices to a voice VLAN, the system automatically configures quality of service (QoS) parameters for
voice traffic, improving the transmission priority of voice traffic and ensuring voice quality.
Common voice devices include IP phones and integrated access devices (IADs). Only IP phones are used
in the voice VLAN configuration examples in this chapter.
When an IP phone accesses a device, the device must have completed the following tasks:
Identifying the IP phone and obtaining the MAC address of the IP phone, so that the device can
•
perform security authentication for the IP phone and increase the priority for voice traffic.
• Advertising the voice VLAN information to the IP phone, so that the IP phone can automatically
configure the voice VLAN according to the received information and the voice packets sent out of
the IP phone can be transmitted within the voice VLAN.

Methods of identifying IP phones

OUI addresses

A device determines whether a received packet is a voice packet by checking its source MAC address.
A packet whose source MAC address complies with the voice device's Organizationally Unique
Identifier (OUI) address is regarded as voice traffic.
You can configure the OUI addresses of a device in advance or use the default OUI addresses.
lists the default OUI address for each vendor's devices. The switch supports 128 OUI addresses.
Table 14 The default OUI addresses of different vendors
Number
1
2
OUI address
0001-e300-0000
0003-6b00-0000
119
Vendor
Siemens phone
Cisco phone
Table 14