Extreme Networks BlackDiamond 6800, Installation And User Manual

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Asynchronous Transfer Mode (ATM) Module Installation and User Guide 3-31
Configuring QoS Functions
To configure the scheduling parameters for a specified QoS profile, use the following
command:
config qosprofile <qosprofile> {minbw <percent>} {maxbw <percent>}
{priority <level>} {minbuf <percent>} {maxbuf <percent>} {<portlist>}
{egress | ingress}
The optional
egress
and
ingress
keywords apply only to ATM ports. As stated earlier,
the ATM module supports eight egress queues and eight ingress queues per port, and
the scheduling parameters for these queues are controlled by QoS profiles qp1-qp8,
which means queue #0 is controlled by qp1, queue #1 is controlled by qp2, and so on.
The optional
portlist
parameter allows QoS profiles to be customized on a
port-by-port basis for the ATM module. The
egress
and
ingress
keywords allow you
to fine-tune the customization (down to a particular egress or ingress queue on a given
port). If you do not enter either the
egress
or
ingress
keyword in the command, the
configured parameters apply to the egress queue associated with the specified QoS
profile by default.
The
minbw
parameter specifies the minimum percentage of the bandwidth guaranteed
to be available to the specified queue for transmissions from the QoS profile. The value
is an integer in the range from 0 through 100. The default value is 0. The sum of the
minimum bandwidth parameters across all eight QoS profiles cannot exceed 90%.
The
maxbw
parameter specifies the maximum percentage of the bandwidth that the
specified queue can use for transmissions from the QoS profile. The value is an integer
in the range from 1 through 100. The default value is 100.
The optional
priority
keyword and
level
parameter specify the service priority for
the specified queue. The service priority determines which traffic is scheduled when
bandwidth is still available after the minimum requirements of all profiles have been
satisfied. Settings for
level
include: low, lowHi, normal, normalHi, medium,
mediumHi, high, or highHi. The default setting is low.
The
minbuf
and
maxbuf
keywords do not apply to ATM ports.
Classification and Replacement Policies
This section deals primarily with classification operations performed by the ATM
module.
Most of the existing ingress classification functions are supported for LLC
Encapsulation for Routed Protocols or LLC Encapsulation for Bridged Protocols