Chapter 9 Quality of Service (QoS)
124
Meter Type
This shows the traffic metering algorithm used in this policer.
The
Simple Token Bucket
algorithm uses tokens in a bucket to control when traffic can be
transmitted. Each token represents one byte. The algorithm allows bursts of up to
b
bytes
which is also the bucket size.
The
Single Rate Three Color Marker
(srTCM) is based on the token bucket filter and
identifies packets by comparing them to the Committed Information Rate (CIR), the
Committed Burst Size (CBS) and the Excess Burst Size (EBS).
The
Two Rate Three Color Marker
(trTCM) is based on the token bucket filter and
identifies packets by comparing them to the Committed Information Rate (CIR) and the
Peak Information Rate (PIR).
Committed
Rate
Specify the committed rate. When the incoming traffic rate of the member QoS classes is
less than the committed rate, the device applies the conforming action to the traffic.
Committed
Burst Size
Specify the committed burst size for packet bursts. This must be equal to or less than the
peak burst size (two rate three color) or excess burst size (single rate three color) if it is also
configured.
This is the maximum size of the (first) token bucket in a traffic metering algorithm.
Conforming
Action
Specify what the Device does for packets within the committed rate and burst size (green-
marked packets).
•
Pass:
Send the packets without modification.
•
DSCP Mark:
Change the DSCP mark value of the packets. Enter the DSCP mark value to
use.
Non-
Conforming
Action
Specify what the Device does for packets that exceed the excess burst size or peak rate and
burst size (red-marked packets).
•
Drop:
Discard the packets.
•
DSCP Mark:
Change the DSCP mark value of the packets. Enter the DSCP mark value to
use. The packets may be dropped if there is congestion on the network.
Available
Class
Selected Class
Select a QoS classifier to apply this QoS policer to traffic that matches the QoS classifier.
Highlight a QoS classifier in the
Available Class
box and use the
>
button to move it to the
Selected Class
box.
To remove a QoS classifier from the
Selected Class
box, select it and use the
<
button.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 44
Policer Setup: Add/Edit (continued)
LABEL
DESCRIPTION
