128
Figure 112 QoS classification configuration-completed
Click
Save/Apply
. This configuration takes effective at once.
QoS-802.1p Setting
The IEEE 802.1p priority marking method is a standard for
prioritizing network traffic at the data link/Mac sub-layer 802.1p
traffic is simply classified and sent to the destination, with no
bandwidth reservations established.
The follow diagram shows the structure of 802.1Q Frame. The
802.1Q header includes a 3-bit prioritization field, which allows
packets to be grouped to be grouped into eight levels of priority
(0-7), where level 7 is the highest one. In addition, DSL maps
these eight levels to priority queues, where queue 1 has the
highest priority.
Layer 2 802.Q frame
Preamble
SFD
DA
SA
mark
(4
word)
Len/Etype
(2 word)
DATA
FCS
Mark
TPID(0x8100)
Priority(3bit)
CFI (1bit)
VLAN ID (12bit)
For example: mark the frame of 802.1p that queued to Queue 9
on value 2.
