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Quality of Service (QoS): Managing Bandwidth More Effectively
Differentiated Services Codepoint (DSCP) Mapping
For example, in the default configuration, the following codepoint settings are
true:
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:
Figure 5-16. 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 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):
Codepoint Default
Priority
001100 1
001101 No-override
001110 2
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
ProCurve (config)# qos dscp-map 001100 priority 3
ProCurve (config)# qos dscp-map 001101 priority 3
ProCurve (config)# qos dscp-map 001110 priority 3
ProCurve (config)# write memory
ProCurve (config)# show config
Startup configuration:
; 498358-B21 Configuration Editor; Created on release #Z.14.XX
hostname "ProCurve 6120G/XG Blade Switch"
qos dscp-map 001100 priority 3
qos dscp-map 001101 priority 3
qos dscp-map 001110 priority 3
interface D1
.
.
.
Configure these three codepoints
with non-default priorities.
Show config lists the non default
codepoint settings.