H3C S6850 Series Configuration Guide

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voice-vlan qos cos-value dscp-value
By default, a port modifies the CoS and DSCP values for voice VLAN packets to 6 and 46,
respectively.
If a port trusts the QoS priority settings in incoming voice VLAN packets, the port does not
modify their CoS and DSCP values.
Configuring voice VLAN assignment modes for a
port
Configuring a port to operate in automatic voice VLAN
assignment mode
Restrictions and guidelines
• Do not configure a VLAN as both a voice VLAN and a protocol-based VLAN.
{ A voice VLAN in automatic mode on a hybrid port processes only tagged incoming voice
traffic.
{ A protocol-based VLAN on a hybrid port processes only untagged incoming packets. For
more information about protocol-based VLANs, see "Configuring protocol-based VLANs."
• As a best practice, do not use this mode with MSTP. In MSTP mode, if a port is blocked in the
MSTI of the target voice VLAN, the port drops the received packets instead of delivering them to
the CPU. As a result, the port will not be dynamically assigned to the voice VLAN.
• As a best practice, do not use this mode with PVST. In PVST mode, if the target voice VLAN is
not permitted on a port, the port is placed in blocked state. The port drops the received packets
instead of delivering them to the CPU. As a result, the port will not be dynamically assigned to
the voice VLAN.
• As a best practice, do not configure both dynamic MAC-based VLAN assignment and automatic
voice VLAN assignment mode on a port. They can have a negative impact on each other.
Procedure
1. Enter system view.
system-view
2. (Optional.) Set the voice VLAN aging timer.
voice-vlan aging minutes
By default, the aging timer of a voice VLAN is 1440 minutes.
The voice VLAN aging timer takes effect only on ports in automatic voice VLAN assignment
mode.
3. (Optional.) Enable the voice VLAN security mode.
voice-vlan security enable
By default, the voice VLAN security mode is enabled.
4. (Optional.) Add an OUI address for voice packet identification.
voice-vlan mac-address oui mask oui-mask [ description text ]
By default, system default OUI addresses exist. For more information, see Table 1.
5. Enter Layer 2 Ethernet interface view.
interface
interface-type interface-number
6. Configure the link type of the port.
{ port link-type trunk

H3C S6850 Series Specifications

General

Brand	H3C
Model	S6850 Series
Category	Switch
Language	English