Network Load Control
142
8.4
QoS/Priority
Basic Configuration
Release
6.0
07/2010
8.4.2 VLAN tagging
The VLAN tag is integrated into the MAC data frame for the VLAN and
Prioritization functions in accordance with the IEEE 802 1Q standard. The
VLAN tag consists of 4 bytes. It is inserted between the source address field
and the type field.
For data packets with a VLAN tag, the device evaluates
X the priority information and
X the VLAN information if VLANs have been set
up.
Data packets with VLAN tags containing priority information but no VLAN
information (VLAN ID = 0), are known as Priority Tagged Frames.
Priority
entered
Traffic class for
RS20/RS30/
RS40,
MACH 1000,
MS20/MS30,
OCTOPUS
(default)
Traffic Class for
PowerMICE,
MACH 104/
MACH 1040 and
MACH 4000
default setting)
IEEE 802.1D traffic type
0 1 2 Best effort (default)
1 0 0 Background
2 0 1 Standard
3 1 3 Excellent effort (business critical)
4 2 4 Controlled load
(streaming multimedia)
5 2 5 Video, less than 100 milliseconds of
latency and jitter
6 3 6 Voice, less than 10 milliseconds of
latency and jitter
7 3 7 Network control reserved traffic
Table 12: Assignment of the priority entered in the tag to the traffic classes
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