D-Link DES-3326SRM, Command Line Interface Reference Manual

Page: 156 / 354

DES-3326SR Layer 3 Fast Ethernet Switch CLI Reference Manual
156 QOS Commands
config scheduling
Purpose Used to configure traffic scheduling for each
of the switch
’ s COS queues.
Syntax config scheduling <class_id 0-3>
{max_packet <value 0-255>/max_latency
<value 0-255>}
Description The switch contains four hardware priority
queues per port. The config scheduling
command is used to specify the round robin
rotation by which these four hardware
priority queues are emptied. The switch
’ s
default is to empty the four hardware
queues in order, from the highest priority
(queue 0) to the lowest priority (queue 3).
Each priority queue will transmit all of the
packets in its buffer before allowing the next
lower priority queue to transmit its packets.
When the lowest priority queue (queue 3)
had finished transmitting all of the packets
in its buffer, the highest priority queue can
again transmit any packets in its buffer.
The max_packets parameter allows you to
specify the maximum number of packets a
given priority queue can transmit before
allowing the next lowest priority queue to
begin transmitting its packets. A value
between 0 and 255 packets can be specified.
For example, if a value of 3 is specified, then
the highest priority queue (queue 0) will be
allowed to transmit 3 packets
−
then the
next lower priority queue (queue 1) will be
allowed to transmit 3 packets, and so on,
until all of the queues have transmitted 3
packets. The process will then repeat.
The max_latency parameter allows you to