user manual

AT-GS950/48PS Switch Web Interface User’s Guide
179
The problem with this method is that some low priority packets might never
be transmitted from the switch because the algorithm might never have
time to process the packets waiting in the lower priority queues.
Weighted Round Robin Priority Scheduling
The weighted round robin (WRR) scheduling method functions as its name
implies. The port transmits a set number of packets from each queue, in a
round robin fashion, so that each has a chance to transmit traffic.Normally,
the higher the queue’s priority the more packets are transmitted in as the
algorithm cycles through the queues in turn. This method guarantees that
every queue receives some attention from the port for transmitting
packets.
Table 5 shows the WRR settings for the number of packets transmitted
from each queue. These values are permanent and you cannot be change
these values.
Table 5. Example of Weighted Round Robin Priority
Port Egress Queue
Maximum Number of
Packets
Q3 8
Q2 4
Q1 2
Q0 1