Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
a. Determine the DSCP you want to assign to the selected packets. (This
codepoint will be used to overwrite the DSCP carried in packets
received through the source-port from upstream devices.)
b. Determine the 802.1p priority you want to assign to the DSCP.
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
8-62.)
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
8-14 on page 8-63 on page 8-63.)
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.
8-60
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