Quickly listing non-default codepoint settings

The DSCP Policy Table in Differentiated Services Codepoint (DSCP) mapping, lists the switch’s default codepoint/priority settings. If you change the priority of any codepoint setting to a non-default value and then execute write memory, the switch will list the non-default setting in the show config display. For example, in the default configuration, the following codepoint settings are true:

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:

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 port member of a VLAN.

Unchanged

Received on an Untagged port member of a VLAN; Forwarded on a tagged port member of a VLAN.

0 (zero)—”normal”

Forwarded on an Untagged port member of a VLAN.

None