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.
