User`s manual

Chapter 1 Overview
20
 Port-based VLANs. See description in the Support for Port-Based VLAN
section below
 Tag-based VLAN switching per IEEE 802.1Q. This mode is used to handle
traffic in accordance with user-defined forwarding rules that are based on the
IEEE 802.1Q tags of the frames. For the external LAN ports (LAN 1, LAN 2,
LAN 3 and LAN 4), the user can also select whether to discard untagged
frames, or process them.
See description in the Support for 802.1Q Tag-Based VLAN Switching section
below. MuxPro series also support double tagging.
1.6.3.5 QoS Support
The switch provides support for quality-of-service (QoS) features. Four traffic
classes are supported, where each class is typically assigned to a type of
prioritized frame stream.
The user can specify the QoS criteria from one the following options (or
alternatively, can disable the QoS functionality):
 Priority determined in accordance with the VLAN ID; for identical VLAN IDs,
the priority is determined by the frame DSCP field (the Differentiated Services
Code point, specified in RFC2474).
 Priority determined in accordance with the DSCP value, and for identical
DSCP values, by the VLAN ID.
 Priority determined only by IEEE 802.1p VLAN tag.
 Priority determined only by the RFC2474 DSCP value.
Note:
The user can configure, for each port, whether it will
participate in a port-based VLAN or will use 802.1Q
tag-based switching. However, a port configured to use
802.1Q tag-based switching may still be included in a
port-based VLAN, where it will serve as egress port for
other ports in the same VLAN.
The switch operates in the IEEE 802.1Q SVL mode.