3Com 3500 - page 710

710 CHAPTER 22: QUALITY OF SERVICE (QOS) AND RSVP
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qos control define For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Defines a control fo r one or more existing c lassifiers.
Valid Minimum Abbreviation
q co def
Important Considerations
■A control can assign multiple rate limit values and an IEEE 802.1p
priority tag value to the packets that are associated with one or more
classifiers.
■The system prompts you according to the rate limit type that you
select. You can only use one rate limit type (none, receivePort, or
aggregate) per control. Fo r a type of receivePort or
aggregate, you can specify multiple rate-limit values for groups of
ports or individual ports. The aggregate rate limit type can only be
applied to flow classifiers.
■Loss-eligible p ackets are conforming packets that are discarded
instead of queued when transmit queues back up beyond a threshold.
You can specify whether conforming packets (as well as
nonconforming excess packets) are loss eligible when you define the
control. Markin g packets loss elig ible is useful for an intelligent dis card
of traffic in a congestion situation. Nonconfor ming excess packets are
packets that exceed the specified rate limit.
■With the QoS timer control, you can config ure QoS control sessions
with starting and ending times (similar to using a VCR ).
Options
Prompt Description Possible Values [Default]
Control
number
Number of the control.
Control numbers 1 – 4 are
predefined controls.
■5 – 50
■? (for a list of
selectable
values)
1 (factory
default)