Specifications

config scheduling_mechanism
Purpose Used to configure the scheduling mechanism for the QoS function
Syntax config scheduling mechanism [strict | weight_fair]
Description The config scheduling_mechanism command allows the user to select between a Weight Fair
(WRR) and a Strict mechanism for emptying the priority classes of service of the QoS function.The Switch
contains 7 hardware priority classes of service. Incoming packets must be mapped to one of these seven
hardware priority classes of service.This command is used to specify the rotation by which these seven
hardware priority classes of service are emptied.
The Switch’s default is to empty the seven priority classes of service in order – from the highest priority class
of service (queue 6) to the lowest priority class of service (queue 0). Each queue will transmit all of the packets
in its buffer before allowing the next lower priority class of service to transmit its packets. Lower classes of
service will be pre-empted from emptying its queue if a packet is received on a higher class of service.The
packet that was received on the higher class of service will transmit its packet before allowing the lower class
to resume clearing its queue.
Parameters strict – Entering the strict parameter indicates that the highest class of service is the first to be processed.
That is, the highest class of service should finish emptying before the others begin.
weight_fair – Entering the weight fair parameter indicates that the priority classes of service will empty packets
in a weighted round-robin (WRR) order.That is to say that they will be emptied in an even distribution.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure the traffic scheduling mechanism for each COS queue:
AT-9724TS:4# config scheduling_mechanism strict
Command: config scheduling_mechanism strict
S u c c e s s .
A T - 9 7 2 4 T S : 4 #
show scheduling_mechanism
Purpose Used to display the current traffic scheduling mechanisms in use on the Switch.
Syntax show scheduling_mechanism
Description This command will display the current traffic scheduling mechanisms in use on the Switch.
Parameters None.
Restrictions None.
Example usage:
To show the scheduling mechanism:
AT-9724TS:4# show scheduling_mechanism
Command: show scheduling_mechanism
Q O S s c h e d u l i n g _ m e c h a n i s m
C L A S S I D M e c h a n i s m
- - - - - - - - - - - - - - - - -
C l a s s - 0 s t r i c t
C l a s s - 1 s t r i c t
C l a s s - 2 s t r i c t
C l a s s - 3 s t r i c t
C l a s s - 4 s t r i c t
C l a s s - 5 s t r i c t
C l a s s - 6 s t r i c t
A T - 9 7 2 4 T S : 4 #
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Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch • Command Line Interface Reference Manual