Traffic control
136
8.4
Prioritization
Basic - L3P
Release
3.1
06/07
8.4.2 Tagging
The VLAN tag is integrated into the MAC data frame for the VLAN and prio-
ritization functions in accordance with the IEEE 802.1 Q standard. The VLAN
tag consists of 4 Bytes. It is inserted between the source address field and
the type field.
With data packets with VLAN tag, the Switch evaluates
D the priority information at all times, and
D the VLAN information, if VLANs have been set up.
Data packets whose VLAN tags contain priority information but no VLAN
information (VLAN ID = 0) are known as “Priority Tagged Frames”.
Note: Network logs and redundancy mechanisms use the highest priority
classes
3 (RS20/30/40, MS20/30, MACH 1000, OCTOPUS) and 7 (Power
MICE, MACH 4000). You therefore select other priority classes for application
data.
Entered
priority
Priority class
(default)
IEEE 802.1D traffic type
0 2 Best Effort (default)
1 0 Background
2 1 Standard
3 3 Excellent Effort (business critical)
4 4 Controlled load
(streaming multimedia)
5 5 Video, less than 100 millisconds of latency and jitter
6 6 Voice; less than 10 milliseconds of latency and jitter
7 7 Network Control reserved traffic
Table 9: Assignment of the priorities listed in the tag to the four priority classes
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