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Two-Rate Tricolor Marking, Color-Aware Mode
In color-aware mode, the metering treatment the
packet receives depends on its classification. Metering can increase
a packet’s preassigned PLP, but cannot decrease it, as shown
in Table 45.
Table 45: Color-Aware
Mode TCM Mapping
|
Incoming PLP
|
Packet Metered Against
|
Possible Cases
|
Outgoing PLP
|
|
low
|
CIR and PIR
|
Packet does not exceed the CIR.
|
low
|
|
Packet exceeds the CIR but not the PIR.
|
medium-high
|
|
Packet exceeds the PIR.
|
high
|
|
medium-low
|
PIR only
|
Packet does not exceed the CIR.
|
medium-low
|
|
Packet does not exceed the PIR.
|
medium-low
|
|
Packet exceeds the PIR.
|
high
|
|
medium-high
|
PIR only
|
Packet does not exceed the CIR.
|
medium-high
|
|
Packet does not exceed the PIR.
|
medium-high
|
|
Packet exceeds the PIR.
|
high
|
|
high
|
Not metered by the policer.
|
All cases.
|
high
|
The following sections describe color-aware two-rate
PLP mapping in more detail.
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