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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Codepoint Default
Priority
001100 1
001101 No-override
001110 2
If you change all three settings to a priority of 3, and then execute write memory,
the switch will reflect these changes in the show config listing:
Configure these three codepoints
with non-default priorities.
Show config lists the non default
codepoint settings.
Figure 15-31. Example of Show Config Listing with Non-Default Priority Settings in
the DSCP Table
Effect of “No-override”. In the QoS Type-of-Service differentiated services
mode, a No-override assignment for the codepoint of an outbound packet
means that QoS is effectively disabled for such packets. That is, QoS does not
affect the packet queuing priority or VLAN tagging. In this case, the packets
are handled as follows (as long as no other QoS feature creates priority
assignments for them):
802.1Q Status Outbound 802.1p
Priority
Received and Forwarded on a tagged VLAN Unchanged
Received on an Untagged VLAN; Forwarded on a 0 (zero)—”normal”
tagged VLAN
Forwarded on an Untagged VLAN None
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