- Allied Telesis, Inc Switches Owner's Manual

Page 17 | AlliedWare™ OS How To Note: QoS configuration
Full QoS scenario 1 : tiered services for a single customer
RED curves—a refresher
Random Early Discard curves are bandwidth class aware, and can drop lower priority packets
when severe congestion occurs, with progressively more and higher priority packets dropped
until congestion is eased. This is useful for TCP flows, because the sender will slow the rate
of transmission when it detects a packet loss.
These curves are very lenient on green traffic, but will quickly start dropping yellow and red
traffic when congestion occurs.
Colours of packets over time
Minburst bucket Maxburst bucket
12K
228K
216K
48K
132K
204K
96K
144K
24K
36K
60K
72K
108K
120K
156K
168K
180K
192K
0
Bits
123 456789
Seconds
E
1
E
2
E
3
C
4
C
5
E
6
E
7
Minbandwidth