DES-3526 Layer 2 Fast Ethernet Switch
config scheduling
transmitting its packets. A value between 0 and 255 can be specified.
For example, if a value of 3 is specified, then the highest hardware
priority queue (number 3) will be allowed to transmit 3 packets − then
the next lowest hardware priority queue (number 2) 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 specify the maximum
amount of time that packets are delayed before being transmitted to a
given hardware priority queue. A value between 0 and 255 can be
specified. This number is then multiplied by 16 ms to determine the
maximum latency. For example, if 3 is specified, the maximum latency
allowed will be 3 X 16 = 48 ms.
When the specified hardware priority queue has been waiting to
transmit packets for this amount of time, the current queue will finish
transmitting its current packet, and then allow the hardware priority
queue whose max_latency timer has expired to begin transmitting
packets.
Parameters
<class_id 0-3> − This specifies which of the four hardware priority
queues the config scheduling command will apply to. The four
hardware priority queues are identified by number − from 0 to 3 − with
the 0 queue being the lowest priority.
max_packet <value 0-255> − Specifies the maximum number of
packets the above specified hardware priority queue will be allowed to
transmit before allowing the next lowest priority queue to transmit its
packets. `A value between 0 and 255 can be specified.
max_latency <value 0-255> − Specifies the maximum amount of time
the above specified hardware priority queue will be allowed to transmit
packets before allowing the next lowest hardware priority queue to
begin transmitting its packets. A value between 0 and 255 can be
specified − with this value multiplied by 16 ms to arrive at the total
allowed time for the queue to transmit packets. For example, a value
of 3 specifies 3 X 16 = 48 ms. The queue will continue transmitting the
last packet until it is finished when the max_latency timer expires.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure the traffic scheduling mechanism for each queue:
DES-3526:4# config scheduling 0 max_packet 100 max_latency 150
Command: config scheduling 0 max_packet 100 max_latency 150
Success.
DES-3526:4#
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