H3C S6850 Series Configuration Guide

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Manual mode
Use manual mode when only IP phones access the network through the device, as shown in Figure
15. In this mode, ports are assigned to a voice VLAN that transmits voice traffic exclusively. No data
traffic affects the voice traffic transmission.
You must manually assign the port that connects to the IP phone to a voice VLAN. The device uses
the source MAC address of the received voice packets to match its OUI addresses. If the match
succeeds, the device issues ACL rules to set the packet precedence.
To remove the port from the voice VLAN, you must manually remove it.
Cooperation of voice VLAN assignment modes and IP
phones
Some IP phones send out VLAN-tagged packets, and others send out only untagged packets. For
correct packet processing, ports of different link types must meet specific configuration requirements
in different voice VLAN assignment modes.
If an IP phone sends out tagged voice traffic, and its access port is configured with 802.1X
authentication, guest VLAN, Auth-Fail VLAN, or critical VLAN, VLAN IDs must be different for the
following VLANs:
• Voice VLAN.
• PVID of the access port.
• 802.1X guest, Auth-Fail, or critical VLAN.
If an IP phone sends out untagged voice traffic, the PVID of the access port must be the voice VLAN.
In this scenario, 802.1X authentication is not supported.
Access ports do not transmit tagged packets.
Configuration requirements for transmitting tagged voice traffic
Port link
type
Voice VLAN
assignment mode
Configuration requirements
Trunk
Automatic The PVID of the port cannot be the voice VLAN.
Manual
The PVID of the port cannot be the voice VLAN.
The port must forward packets from the voice VLAN.
Hybrid
Automatic The PVID of the port cannot be the voice VLAN.
Manual
The PVID of the port cannot be the voice VLAN.
The port must forward packets from the voice VLAN with VLAN
tags.
Configuration requirements for transmitting untagged voice traffic
When IP phones send out untagged packets, you must set the voice VLAN assignment mode to
manual.
Table 2 Configuration requirements for ports in manual mode to support untagged voice
traffic
Port link
type
Configuration requirements
Access The voice VLAN must be the PVID of the port.
Trunk The voice VLAN must be the PVID of the port.

H3C S6850 Series Specifications

General

Brand	H3C
Model	S6850 Series
Category	Switch
Language	English