3Com WX1200 3CRWX120695A Configuration Manual page 332

332 C 16: C
HAPTER ONFIGURING
Q S
UALITY OF ERVICE
Figure 24 QoS on WX Switches—Classification of Ingress Packets
WX receives packet.
802.1p value
that is not 0?
DSCP value
that is not 0?
ACE on egress VLAN
or MAP sets CoS?
Use CoS mapped
from DSCP or
802.1p, or leave
CoS unset if 802.1p
and DSCP are both 0.
Yes
No (802.1p = 0)
Yes
No (DCSP = 0)
Yes
No
Set packet CoS
based on 802.1p:
1 -> 1
2 -> 2
3 -> 3
4 -> 4
5 -> 5
6 -> 6
7 -> 7
Look up CoS for
DSCP value and
set packet CoS:
0 - 7 -> 0
8 - 15 -> 1
16 - 23 -> 2
24 - 31 -> 3
32 - 39 -> 4
40 - 47 -> 5
48 - 55 -> 6
56 - 63 -> 7
Set packet CoS
to ACE CoS value.
Mark egress packet.