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Single-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 43.

Table 43: Color-Aware Mode TCM PLP Mapping

Incoming PLP

Packet Metered Against

Possible Cases

Outgoing PLP

low

CBS and EBS

Packet does not exceed the CBS.

low

Packet exceeds the CBS but not the EBS.

medium-high

Packet exceeds the EBS.

high

medium-low

EBS only

Packet does not exceed the CBS.

medium-low

Packet does not exceed the EBS.

medium-low

Packet exceeds the EBS.

high

medium-high

EBS only

Packet does not exceed the CBS.

medium-high

Packet does not exceed the EBS.

medium-high

Packet exceeds the EBS.

high

high

Not metered by the policer.

All cases.

high

The following sections describe single-rate color-aware PLP mapping in more detail.


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