Alcatel-Lucent 1643 AMS Applications And Planning Manual page 233

Ethernet Overview
Peak Information Rate (PIR)
Important! Provisioning of rate controllers does not apply to network-role ports
(see
In general, the behavior of the rate controller is characterized as follows:
• All packets below CIR are marked green.
• All packets above CIR are marked yellow.
• All packets above PIR are marked red and dropped.
In case oversubscription support is disabled (QoS_osub = disabled), then the
provisioning of the PIR is ignored and system-internally the value of the CIR is
taken instead. This leads to a strict policing of all flows entering at a customer-role
port of this VS.
Rate control modes
The rate controller can operate in two different modes:
1. Strict policing mode (CIR = PIR)
The strict policing mode allows each user to subscribe to a minimum committed SDH
WAN bandwidth, or CIR (committed information rate). This mode will guarantee the
bandwidth up to CIR but will drop any additional incoming frames at the ingress LAN
port that would exceed the CIR.
All packets below CIR are marked green; all packets above PIR (= CIR) are marked
red and dropped.
....................................................................................................................................................................................................................................
365-312-801R7.2
Issue 3, May 2007
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 LKA4 unit, any PIR is interpreted as
infinite (if not: CIR=0, or CIR=PIR).
"Quality of Service (QoS) overview" (p.
CIR = PIR
0 kbit/s CIR=PIR
green
Alcatel-Lucent - Proprietary
See notice on first page
11-51)).
< MAX
red
Information
rate
Classification, queueing and scheduling
11-57