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Quality of Service: Managing Bandwidth More Effectively
Globally-Configured QoS
3. If necessary, use the qos dscp-map < codepoint > priority < 0 - 7 > command
to configure the DSCP policy (codepoint and associated 802.1p priority)
that you want to use to mark matching packets.
Prerequisite A DSCP codepoint must have a preconfigured 802.1p priority (0 - 7) before
you can use the codepoint to mark matching packets. If a codepoint you want
to use shows No-override in the Priority column of the DSCP Policy table (show
qos dscp-map command), you must first configure a priority for the codepoint
before proceeding (qos dscp-map priority command). See “Differentiated Ser-
vices Codepoint (DSCP) Mapping” on page 6-88 for more information.
Syntax: qos dscp-map < codepoint > priority <0 - 7>>
(Optional) This command is required only if an 802.1p
priority is not
already assigned to the specified <codepoint >
in the DSCP Policy table (see Table 6-11 on page 6-89).
Valid values for a DSCP codepoint are as follows:
- A binary value for the six-bit codepoint from 000000 to
111111.
- A decimal value from 0 (low priority) to 63 (high priority)
that corresponds to a binary DSCP bit set
-An ASCII standard name for a binary DSCP bit set:
af11 (001010) af42 (100100)
af12 (001100) af43 (100110)
af13 (001110) ef
(101110)
af21 (010010) cs1
(001000) = precedence 1
af22 (010100) cs2
(010000) = precedence 2
af23 (010110) cs3
(011000) = precedence 3
af31 (011010) cs4
(100000) = precedence 4
af32 (011100) cs5
(101000) = precedence 5
af33 (011110) cs6
(110000) = precedence 6
af41 (100010) cs7
(111000) = precedence 7
default
(000000)
Type ? to display the list of valid codepoint entries.
When the switch applies the specified DSCP policy 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. For IP packets, the DSCP
will be replaced by the codepoint specified in this command.
(Default: No-override
for most codepoints. See Table 6-11.)
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