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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
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Syntax: qos type-of-service diff-services
Causes the switch to read the DSCP of an incoming IP packet
and, when a match occurs, assign a corresponding 802.1p
priority, as configured in the switch’s DSCP table (page
15-52).
no qos type-of-service
Disables all ToS classifier operation.
no qos dscp-map < codepoint >
Disables direct 802.1p priority assignment to packets carry-
ing 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
15-13 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
15-54. Refer also to “Differentiated Services Codepoint
(DSCP) Mapping” on page 15-51.)
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
15-29