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Quality of Service: Managing Bandwidth More Effectively
Differentiated Services Codepoint (DSCP) Mapping
Displaying Non-Default Codepoint Settings
Table 6-11 displays the switch’s default codepoint-priority assignments. If you
change the priority of any codepoint to a non-default value and then enter the
write memory command, the switch will list the non-default setting in the show
config display.
Example. the default configuration has the following DSCP-priority settings:
Codepoint Default
Priority
001100 1
001101 No-override
001110 2
If you reconfigure these three codepoints to a priority of 3 and then enter the
write memory command, the switch displays the changes in the show config
listing:
Configures three codepoints with
non-default priorities.
The “show config” command lists
the non-default codepoint settings.
Figure 6-40. Displaying Non-Default Priority Settings in the DSCP Table
Effect of “No-override”. If you configure a global IP-Diffserv classifier and
No-override is displayed for the 802.1p priority associated with a codepoint,
DSCP marking cannot be performed on matching outbound packets. How-
ever, QoS does not affect the packet-queuing 802.1p priority or VLAN tagging
carried in the packet.
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