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5-30
Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers to Configure Quality of Service for Outbound Traffic
3. Configure the DSCP policy by using qos dscp-map to configure the priority
for each codepoint. (For details, refer to the example later in this section
and to “Differentiated Services Codepoint (DSCP) Mapping” on page
5-33.)
Note A codepoint must have an 802.1p priority assignment (0 - 7) before you can
configure that codepoint as a criteria for prioritizing packets by source-port.
If a codepoint shows No-override in the Priority column of the DSCP Policy
Table (show qos dscp-map), then you must assign a 0 - 7 priority before
proceeding.
4. Configure the switch to assign the DSCP policy to packets from the
specified source-port.
Syntax: qos dscp-map < codepoint > priority < 0 - 7 >
This command is optional if a priority has already been
assigned to the < codepoint >. The command creates a DSCP
policy by assigning an 802.1p priority to a specific DSCP.
When the switch applies this priority to a packet, the priority
determines the packet’s queue in the outbound port to which
it is sent. If the packet leaves the switch on a tagged port, it
carries the 802.1p priority with it to the next downstream
device. (Default: For most codepoints,
No-override. See figure
5-9 on page 5-34 on page 5-34.)
Syntax: interface < port-list > qos dscp < codepoint >
Assigns a DSCP policy to packets from the specified source-
port(s), and overwrites the DSCP in these packets with the
assigned <
codepoint > value. This policy includes an 802.1p
priority and determines the packet’s queue in the outbound
port to which it is sent. If the packet leaves the switch on a
tagged port, it carries the 802.1p priority with it to the next
downstream device. (Default:
No-override)
Syntax: no interface [e] < port-list > qos
Removes QoS classifier for the specified source-port(s).
Syntax: show qos source-port
Displays a listing of all source-port QoS classifiers currently
in the running-config file.