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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
114
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 seven 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:
DGS-3600:4#config scheduling_mechanism strict
Command: config scheduling_mechanism strict
Success.
DGS-3600:4#
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: