Chapter 12 Quality of Service (QoS)
VMG/EMG/AM/DM/GM Series User’s Guide
293
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.
Excess Burst Size Specify the additional amount of bytes that are admitted at the committed rate besides the
committed burst size.
This is the maximum size of the second token bucket in the srTCM.
This field is only available when you select Single Rate Three Color in the Meter Type field.
Peak Rate Specify the maximum rate at which packets are admitted to the network.
The peak rate should be greater than or equal to the committed rate. This is to specify how
many bytes of tokens are added to the second bucket every second in the trTCM.
This field is only available when you select Two Rate Three Color in the Meter Type field.
Peak Burst Size Specify the maximum amount of bytes that are admitted at the committed rate.
This is the maximum size of the second token bucket in the trTCM.
This field is only available when you select Two Rate Three Color in the Meter Type field.
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 the action that the Zyxel Device takes on yellow-marked packets.
Select Pass to forward the packets.
Select Drop to discard the packets.
Select DSCP Mark to assign a specified DSCP number (between 0 and 63) to the packets and
forward them. The packets are dropped if there is congestion on the network.
This field is only available when you select Single/Two Rate Three Color in the Meter Type field.
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.
Regulated Classes Member Setting
Table 83 Network Setting > QoS > Policer Setup > Add New Policer/Edit (continued)
LABEL DESCRIPTION
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