10: Traffic shaper
Traffic shaper configuration
141
•
EIR:
The shaping rate of yellow packets in Kbps (average output rate of the shaper).
•
EBS:
The shaping burst of yellow packets in Bytes (maximum output burst of the shaper).
Traffic shaper statistcs
•
Name:
Unique name assigned to this shaper.
•
CIR:
Instantaneous rate of green packets in Mbps.
•
EIR:
Instantaneous rate of yellow packets in Mbps.
•
Drop green:
Rate of dropped green packets in Mbps.
•
Drop yellow:
Rate of dropped yellow packets in Mbps.
To configure a traffic shaper, do the following:
1. Click on
shaper-1
Enter the desired values for the shaper then enable the shaper and Apply.
BLUE performs queue management based on link utilization. It maintains a marking
probability
pm
to either mark or drop the packets. If the queue is continually dropping the
packets ,
pm
is incremented by a factor /
1.
If the queue is empty or link is idle,
pm
is decremented by a factor /
2
. The value of /
1 should
be set significantly larger than /
2.
This is because link is underutilized when the congestion
management is either too aggressive or too conservative, but packet loss occurs only when
the congestion mechanism is too conservative.
BLUE uses one more parameter
freeze_time,
which determines the time interval between two
successive updates of
pm.
It allows the changes in the marking probability to take effect
before the value is updated again.
