Chapter 16 Quality of Service (QoS)
P-870HN-5xb User’s Guide
208
Meter Type Select how the policer shapes the traffic of the member QoS classes.
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 burst size of packet bursts above which the device will
perform the non-conforming action.
Peak Rate Specify the peak rate. When the incoming traffic rate of the member
QoS classes is greater than the peak rate, the device applies the non-
conforming action to the traffic.
Peak Burst
Size
Specify the peak burst size. This is the maximum size of the second
token bucket in the trTCM.
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.
Partial
Conforming
Action
Specify what the Device does for packets that exceed the committed
rate and burst size but are within the excess burst size or peak rate and
burst size (yellow-marked packets).
• 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. The packets may be dropped if there is
congestion on the network.
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.
Table 73 QoS Policer Setup: Add
LABEL DESCRIPTION
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