Alcatel-Lucent 1643 AMS User's Operation Manual page 438

Traffic provisioning
A two-rate three-color marker is defined by three colors, specifying the dropping
precedence, and two rates as delimiter between the colors. The marker will mark each
packet with a certain color, depending on the rate of arriving packets, and the amount
of credits in the token bucket. The size of the token bucket will determine how long
and far a data burst may be surpassed before the packets are marked with a higher
dropping precedence.
The three colors indicate:
• Green: Low dropping precedence.
• Yellow: Higher dropping precedence.
• Red: The packet will be dropped.
The two rates mean:
Committed Information Rate
(CIR)
Peak Information Rate (PIR)
Important! Provisioning of rate controllers does not apply to "I-NNI" ports (see
"Quality of Service (QoS) overview" (p.
In general, the behavior of the rate controller is characterized as follows:
• All packets below CIR are marked green.
• All packets between CIR and PIR are marked yellow.
• All packets above PIR are marked red and dropped.
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The committed information rate is the delimiter between green and
yellow packets.
If the information rate is less than the committed information rate,
all frames will be admitted to the egress queues. These frames will
be marked "green", and have a low probability to be dropped at the
egress queues.
The peak information rate is the delimiter between yellow and red
packets.
If the information rate is greater than the committed information rate
(CIR), but less than the peak information rate (PIR), the frames will
be admitted to the egress queues. They will be marked "yellow" and
have a high probability to be dropped ("high dropping precedence").
If the information rate is greater than the PIR, the frames will be
marked "red" and dropped immediately.
For the LAN-VPN (M-LAN) operation mode the relationship
between CIR and PIR is determined by the rate control mode.
For the IEEE 802.1Q STP virtual switch mode and the provider
bridge mode the relationship is as specified in the assigned QoS
profile. Note that on the X4IP unit, any PIR is interpreted as infinite
(if not: CIR=0, or CIR=PIR).
Alcatel-Lucent - Proprietary
See notice on first page
Classification, queueing, and scheduling
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365-312-807R7.2
Issue 4, May 2007