User manual

User Manual
Publication date: Feb., 2013
Revision A3
276
VLAN aware switching: This is based on the IEEE 802.1Q standard. All ports are VLAN aware.
Ports connected to VLAN aware switches are members of multiple VLANs and transmit
tagged frames. Other ports are members of one VLAN, set up with this Port VLAN ID, and
transmit untagged frames.
Provider switching: This is also known as Q-in-Q switching. Ports connected to subscribers
are VLAN unaware, members of one VLAN, and set up with this unique Port VLAN ID. Ports
connected to the service provider are VLAN aware, members of multiple VLANs, and set up
to tag all frames. Untagged frames received on a subscriber port are forwarded to the
provider port with a single VLAN tag. Tagged frames received on a subscriber port are
forwarded to the provider port with a double VLAN tag.
VLAN ID
VLAN ID is a 12-bit field specifying the VLAN to which the frame belongs.
Voice VLAN
Voice VLAN is VLAN configured specially for voice traffic. By adding the ports with voice
devices attached to voice VLAN, we can perform QoS-related configuration for voice data,
ensuring the transmission priority of voice traffic and voice quality.