Components Of Voice Vlan Operation; Voice Vlan Qos Prioritizing (Optional) - HP 3500 Series Advanced Traffic Management Manual

Components of Voice VLAN Operation

■ Voice VLAN(s): Configure one or more voice VLANs on the switch. Some
reasons for having multiple voice VLANs include:
• Employing telephones with different VLAN requirements
• Better control of bandwidth usage
• Segregating telephone groups used for different, exclusive purposes
Where multiple voice VLANs exist on the switch, you can use routing to
communicate between telephones on different voice VLANs. .
■ Tagged/Untagged VLAN Membership: If the appliances using a voice
VLAN transmit tagged VLAN packets, then configure the member ports as
tagged members of the VLAN. Otherwise, configure the ports as untagged
members.

Voice VLAN QoS Prioritizing (Optional)

Without configuring the switch to prioritize voice VLAN traffic, one of the
following conditions applies:
■ If the ports in a voice VLAN are not tagged members, then the switch
forwards all traffic on that VLAN at "normal" priority.
If the ports in a voice VLAN are tagged members, then the switch forwards
■
all traffic on that VLAN at whatever priority the traffic has when received
inbound on the switch.
Using the switch's QoS VLAN-ID (VID) Priority option, you can change the
priority of voice VLAN traffic moving through the switch. If all port member-
ships on the voice VLAN are tagged, the priority level you set for voice VLAN
traffic is carried to the next device. With all ports on the voice VLAN config-
ured as tagged members, you can enforce a QoS priority policy moving
through the switch and through your network. To set a priority on a voice
VLAN, use the following command:
Syntax: vlan < vid > qos priority < 0 - 7 >
The qos priority default setting is 0 (normal), with 1 as the
lowest priority and 7 as the highest priority.
For example, if you configured a voice VLAN with a VID of 10, and wanted the
highest priority for all traffic on this VLAN, you would execute the following
command:
HP Switch(config) # vlan 10 qos priority 7
HP Switch(config) # write memory
Static Virtual LANs (VLANs)
Special VLAN Types
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