Differentiated Class; Random Detection - HP procurve 8100fl series Management And Configuration Manual

Differentiated Class

To configure a differentiated class, enter from Special Output Map mode
diff-class <diff-serv class>
where diff-serv-class is one of the following values:
af11—Assured Forwarding Class 1—drop probability 1
af12—Assured Forwarding Class 1—drop probability 2
af13—Assured Forwarding Class 1—drop probability 3
af21—Assured Forwarding Class 1—drop probability 1
af22—Assured Forwarding Class 1—drop probability 2
af23—Assured Forwarding Class 1—drop probability 3
af31—Assured Forwarding Class 1—drop probability 1
af32—Assured Forwarding Class 1—drop probability 2
af33—Assured Forwarding Class 1—drop probability 3
df —Default Forwarding Class (aka best effort)
ef—Expedited Forwarding Class (aka priority)

Random Detection

Random detection allows you to control queues by specifying:
min-queue-fill (for the purpose of this discussion, call this A)
■
max-queue-fill (call this B)
■
max-queue-prob (call this C)
■
To configure random detection use the following command:
ProCurve(config-spomap-dc)#random-detect <min-queue-value>
<max-queue-value> <max-queue-prob in %>
where min-queue-fill is expressed as an integer from 0 to 255 representing
queue depth. This parameter is the threshold at which WRED (Weighted
Random Early Detection, or random detection) is invoked. If you specify 0,
WRED will always be on, If you specify 255, WRED will only be called when
the queue is already full.
The max-queue-fill parameter is the other end of variable A and it works with
the max-queue-prob parameter to determine at what queue saturation level
packets are dropped all the time. Essentially, these B and C variables
constitute coordinates on an xy plane as illustrated in Figure 8-2. The slope
of your random detection algorithm is determined at one end by where you
place A, and at the other end where C and B meet.
QoS Configuration
Using QoS Commands
8-5