3Com CoreBuilder 3500, Command Reference Manual

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710 C
HAPTER
22: Q
UALITY OF
S
ERVICE
(Q
O
S)
AND
RSVP
✓
3500
✓
9000
9400
3900
9300
qos control define For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Defines a control for one or more existing classifiers.
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. For 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 packets
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. Marking packets loss eligible is useful for an intelligent discard
of traffic in a congestion situation. Nonconforming excess packets are
packets that exceed the specified rate limit.
■
With the QoS timer control, you can configure 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)