Quick Reference Guide

412 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Configuring the QoS mappings
15
Notice that DSCP values range from 0 – 63, whereas the internal forwarding priority values range
from 0 – 7. Any DSCP value within a given range is mapped to the same internal forwarding priority
value. For example, any DSCP value from 8 – 15 maps to priority 1.
After performing this mapping, the device maps the internal forwarding priority value to one of the
hardware forwarding queues.
Table 64 list the default mappings of internal forwarding priority values to the hardware forwarding
queues.
You can change the DSCP -> internal forwarding mappings. You also can change the internal
forwarding priority-> hardware forwarding queue mappings.
Changing the DSCP –> internal forwarding priority mappings
To change the DSCP –> internal forwarding priority mappings for all the DSCP ranges, enter
commands such as the following at the global CONFIG level of the CLI.
PowerConnect(config)#qos-tos map dscp-priority 0 2 3 4 to 1
PowerConnect(config)#qos-tos map dscp-priority 8 to 5
PowerConnect(config)#qos-tos map dscp-priority 16 to 4
PowerConnect(config)#qos-tos map dscp-priority 24 to 2
PowerConnect(config)#qos-tos map dscp-priority 32 to 0
4 32 – 39
5 40 – 47
6 48 – 55
7 (highest priority queue) 56 – 63
TABLE 64 Default mappings of internal forwarding priority values
Internal forwarding priority Forwarding queues
0 (lowest priority queue) qosp0
1
1
1. PowerConnect B-Series TI24X devices supports seven priorities instead
of eight when sFlow is enabled. QoS queue 1 is reserved for sFlow and not
used by other packets. Any non-sFlow packets assigned to QoS queue 1 will
be directed to QoS queue 0.
qosp1
2qosp2
3qosp3
4qosp4
5qosp5
6qosp6
7 (highest priority queue) qosp7
TABLE 63 Default DSCP to internal forwarding priority mappings (Continued)
Internal forwarding priority DSCP value