Hirschmann GREYHOUND GRS1020, Справочное руководство

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VLANs
11.4 Creating a Voice VLAN
146
UM Config GRS
Release 8.0 09/2019
11.4 Creating a Voice VLAN
Use the Voice VLAN feature to separate voice and data traffic on a port, by VLAN and/or priority.
A primary benefit of using Voice VLAN is to safeguard the sound quality of an IP phone in cases
where there is high data traffic on the port.
The device uses the source MAC address to identify and prioritize the voice data flow. Using a MAC
address to identify devices helps prevent a rogue client from connecting to the same port causing
the voice traffic to deteriorate.
Another benefit of the Voice VLAN feature is that a VoIP phone obtains a VLAN ID or priority
information using LLDP-MED. As a result, the VoIP phone sends voice data as tagged, priority
tagged or untagged. This depends on the Voice VLAN Interface configuration.
The following Voice VLAN interface modes are possible. The first 3 methods segregate and
prioritize voice and data traffic. Traffic segregation results in an increased voice traffic quality during
high traffic periods.

Configuring the port to using the vlan mode lets the device tag the voice data coming from a
VoIP phone with the user-defined voice VLAN ID. The device assigns regular data to the default
port VLAN ID.

Configuring the port to use the dot1p-priority mode lets the device tag the data coming from
a VoIP phone with VLAN 0 and the user-defined priority. The device assigns the default priority
of the port to regular data.

Configure both the voice VLAN ID and the priority using the vlan/dot1p-priority mode. In
this mode the VoIP phone sends voice data with the user-defined voice VLAN ID and priority
information. The device assigns the default PVID and priority of the port to regular data.

When configured as untagged , the phone sends untagged packets.

When configured as none , the phone uses its own configuration to send voice traffic.