Allied Telesis AT-FS970M Series - Manual (Page 1639)

AT-FS970M Switch Command Line User’s Guide
1639
Prioritizing CoS and DSCP
By default, the DSCP field in Layer 3 packets and the CoS field in Layer 2
frames are ignored by the software. In addition, Trust CoS is enabled by
default. To map a DSCP value to a queue on an egress port, use the
TRUST DSCP command, which is located in the Class Map mode. See
Table 207 and Table 208 for the default mappings. As you can see from
the tables, the highest egress queue is seven, which is assigned the
highest, CoS or DSCP, value.
Table 207. CoS Default Mapping
Egress
Queue
CoS Value
2 0
0 1
1 2
3 3
4 4
5 5
6 6
7 7
Table 208. DSCP Default Mapping
Egress
Queue
DSCP
Value
0 0 - 7
1 8 - 15
2 16 - 23
3 24 - 31
4 32 - 39
5 40 - 47
6 48 - 55
7 56 - 63