DES-3000 Series Layer 2 Switch CLI Reference Manual
config scheduling
Purpose Used to configure traffic scheduling for each of the Switch’s QoS queues.
Syntax
config scheduling <class_id 0-3> {weight <value 1-55}
Description The Switch contains four hardware priority classes of service per device. The Switch’s default
settings draw down the four hardware classes of service in order, from the highest class
(Class 3) to the lowest class (Class 0). Starting with the highest priority class of service
(Class 3), the highest priority class of service will transmit all of the packets and empty its
buffer before allowing the next lower priority class of service to transmit its packets. The next
highest priority class of service will empty before proceeding to the next class of service and
so on. Lower priority classes of service are allowed to transmit only if
the higher priority
classes of service in the buffer are completely emptied. Packets in the higher priority classes
of service are always emptied before any in the lower priority classes of service regardless of
latency or volume of the lower priority classes of service.
The default settings for QoS scheduling employ this strict priority scheme to empty priority
classes of service.
The config scheduling command can be used to specify the round robin rotation by which
these four hardware priority classes of service are reduced.
The weight parameter allows specification of the maximum number of packets a given
priority classes of service can transmit before allowing the next lowest priority queue to begin
transmitting its packets. A value between 0 and 55 packets can be specified. For example, if
a value of 5 is specified, then the highest priority class of service (queue 3) will be allowed to
transmit 5 packets. Then the next lower priority class of service (queue 2) will be allowed to
transmit 5 packets, and so on, until all of the classes of service have transmitted 5 packets.
The process will then repeat.
Parameters
<class_id> − Specifies which of the four priority classes of service to which the config
scheduling command will be applied. The four priority classes of service are identified by
number − from 0 to 3 − with class 3 being the highest priority.
weight <value 1-55> − Specifies the maximum number of packets the above specified priority
class of service will be allowed to transmit before allowing the next lowest priority classes of
service to transmit its packets. A value between 1 and 55 packets can be specified. The
default value is per class is:
Class Weight
0 1
1 2
2 4
3 8
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure traffic scheduling:
DES-3026:4# config scheduling 3 weight 15
Command: config scheduling 3 weight 15
Success.
DES-3026:4#
100
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