Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure QoS for Outbound Traffic
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Syntax: qos type-of-service diff-services < codepoint >
Causes the switch to read the < codepoint > (DSCP) of an
incoming IPv4 packet and, when a match occurs, assign a
corresponding 802.1p priority, as configured in the switch’s
DSCP table (page 6-59).
no qos type-of-service
Disables all ToS classifier operation.
no qos dscp-map < codepoint >
Disables direct 802.1p priority assignment to packets
carrying the < codepoint > by reconfiguring the codepoint
priority assignment in the DSCP table to
No-override. Note that
if this codepoint is in use as a DSCP policy for another
diffserv codepoint, you must disable or redirect the other
diffserv codepoint’s DSCP policy before you can disable or
change the codepoint. For example, in figure 6-16 you cannot
change the priority for the 000000 codepoint until you
redirect the DSCP policy for 000001 away from using
000000 as a policy. (Refer to “Note On Changing a Priority
Setting” on page 6-61. Refer also to “Differentiated Services
Codepoint (DSCP) Mapping” on page 6-58.)
show qos type-of-service
Displays current Type-of-Service configuration. In diffserv
mode it also shows the current direct 802.1p assignments
and the current DSCP assignments covered later in this
section.
For example, an edge switch “A” in an untagged VLAN assigns a DSCP of
000110 on IP packets it receives on port A6, and handles the packets with high
priority (7). When these packets reach interior switch “B” you want the switch
to handle them with the same high priority. To enable this operation you would
configure an 802.1p priority of 7 for packets received with a DSCP of 000110,
and then enable diff-services.
6-38
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