Configuring A Port To Operate In Automatic Voice Vlan Assignment Mode - HP 5120 EI Series Lan Switching Configuration Manual

Step
2. Enter Layer 2 Ethernet
interface view.
3. Configure the interface to trust
the QoS priority settings in
incoming voice traffic, but not
to modify the CoS and DSCP
values marked for incoming
traffic of the voice VLAN.
4. Configure the interface to
modify the CoS and DSCP
values marked for incoming
traffic of the voice VLAN into
specified values.
Configuring a port to operate in automatic voice VLAN
assignment mode
Configuration restrictions and guidelines
• A protocol-based VLAN on a hybrid port can process only untagged inbound packets, whereas the
voice VLAN in automatic mode on a hybrid port can process only tagged voice traffic. Do not
configure a VLAN as both a protocol-based VLAN and a voice VLAN. For more information, see
"Configuring VLANs."
Do not configure automatic voice VLAN assignment together with MSTP, because the former is
•
mainly configured on the access side. With MSTP enabled, if a port is blocked in the MST instance
(MSTI) of the target voice VLAN, the port drops the received packets, instead of delivering them to
the CPU. As a result, the receiving port will not be dynamically assigned to the corresponding
VLAN.
• Do not configure automatic voice VLAN assignment together with PVST, because the former is
mainly configured on the access side. With PVST enabled, if the target voice VLAN is not permitted
on a port, the port is placed in the blocked state and drops the received packets, instead of
delivering them to the CPU. As a result, the receiving port will not be dynamically assigned to the
corresponding VLAN.
Configuration procedure
To set a port to operate in automatic voice VLAN assignment mode:
Step
1. Enter system view.
2. Set the voice VLAN aging
time.
Command
interface interface-type
interface-number
voice vlan qos trust
voice vlan qos cos-value
dscp-value
Command
system-view
voice vlan aging minutes
152
Remarks
N/A
Use either command.
By default, an interface modifies the CoS
value and the DSCP value marked for voice
VLAN traffic into 6 and 46, respectively.
The voice vlan qos command and the voice
vlan qos trust command can overwrite each
other, whichever is configured last.
Remarks
N/A
Optional.
By default, the aging time of a
voice VLAN is 1440 minutes.
The voice VLAN aging time
configuration is only applicable on
ports in automatic voice VLAN
assignment mode.