DES-3000 Series Layer 2 Switch CLI Reference Manual
config scheduling_mechanism
contains four hardware priority classes of service. Incoming packets
must be mapped to one of these four hardware priority classes of
service. This command is used to specify the rotation by which these
four hardware priority classes of service are emptied.
The Switch’s default is to empty the four priority classes of service in
order
−
from the highest priority class of service (queue 3) 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 highest 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. Other classes of service
will follow weight fair scheduling.
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:
DES-3026:4#config scheduling_mechanism strict
Command: config scheduling_mechanism strict
Success.
DES-3026:4#
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 mechanism
in use on the Switch.
Parameters None.
Restrictions None.
Example Usage:
To show the scheduling mechanism:
DES-3026:4#show scheduling_mechanism
Command: show scheduling_mechanism
Scheduling Mechanism : strict
DES-3026:4#
94
