Network load control
18
8.4
QoS/Priority
Basic - L3P
Release
4.0
11/07
X VLAN priority based on IEEE 802.1Q/ 802.1D (Layer 2)
X 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 Prior-
itization 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.
For data packets with a VLAN tag, the Switch evaluates
X the priority information at all times, and
X the VLAN information if VLANs have been set up.
Data packets with VLAN tags containing priority information but no VLAN in-
formation (VLAN ID = 0), are known as Priority Tagged Frames.
Priority en-
tered
Traffic class(de-
fault 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 10: Assignment of the priority entered in the tag to the traffic classes
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