User Manual

38
If there is no classification, (no VLAN and IP TOS 0) the packet falls under the Best Effort class.
If the packet has both VLAN and IP precedence values, the maximum of the two priorities
(VLAN/IP) is used.
The following table shows the mapping of class of service on various DSCP/TOS values.
Class of Service
IP
Precedence
(3 bits)
DSCP (6 bits)
TOS (8 bits)
Best Effort 0,3 0x0 (0)
0x18 (24)
0x1A (26)
0x1C (28)
0x1E (30)
0x0
0x60
0x68
0x70
0x78
Background 1,2 0x8 (8)
0xA (10)
0xC (12)
0xE (14)
0x10 (16)
0x12 (18)
0x14 (20)
0x16 (22)
0x20
0x28
0x30
0x38
0x40
0x48
0x50
0x58
Video 4,5 0x20 (32)
0x22 (34)
0x24 (36)
0x26 (38)
0x28 (40)
0x2E (46)
0x80
0x88
0x90
0x98
0xA0
0xB8
Voice 6,7 0x30 (48)
0x38 (56)
0xC0
0xE0
Queue mapping
The table below shows the mapping of different types of traffic to hardware queues. The
Hardware MAC consists of 10 Queues starting from 0 to 9. Highest priority Queue is 9 and
typically used for beacons. Next highest priority is 8 and is associated with beacon gated frames.
The remaining 8 queues are used for different types of traffic classes. XL100t only uses queues
0-3 and 9.