ZyXEL Communications VMG3925-B10C - Technical Reference

Chapter 10 Quality of Service (QoS)
VMG/XMG Series User’s Guide
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The following table describes the labels in this screen.
10.8 Technical Reference
The following section contains additional technical information about the Zyxel Device features
described in this chapter.
Table 75 Policer Setup: Add/Edit
LABEL DESCRIPTION
Active Click this switch to enable or disable the policer. When the switch turns blue , the function is
enabled. Otherwise, it’s not.
Name Enter the descriptive name of this policer.
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 Zyxel 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.
Partial
Conforming
Action
Specify what the Zyxel Device does for packets that are within the burst size but exceed the
committed rate.
• Pass: Send the packets without modification.
• Drop: Discard the packets.
• DSCP Mark: Change the DSCP mark value of the packets. Enter the DSCP mark value to use.
Non-
Conforming
Action
Specify what the Zyxel 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.
Cancel Click Cancel to exit this screen without saving.
OK Click OK to save your changes.