Network Load Control
UM Basic Configuration L3P
Release
7.1
12/2011
8.4
QoS/Priority
169
Data packets can contain prioritizing/QoS information:
VLAN priority based on IEEE 802.1Q/ 802.1D (Layer 2)
Type of Service (ToS) or DiffServ (DSCP) for IP packets (Layer 3)
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:
the priority information and
the VLAN information if VLANs have been set.
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
(default setting)
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 milliseconds of latency and jitter
6 6 Voice, less than 10 milliseconds of latency and jitter
7 7 Network control reserved traffic
Table 13: Assignment of the priority entered in the tag to the traffic classes
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