Alcatel-Lucent 7450 Quality Of Service Manual page 66

QoS Policies
Figure 9
receive bandwidth. The scheduler distributes bandwidth to the children by first using each
child's CIR according to the CIR-level parameter (CIR L8 through CIR L1 weighted loops).
The weighting at each CIR-Level loop is defined by the CIR weight parameter for each child.
The scheduler then distributes any remaining bandwidth to the children up to each child's rate
parameter according to the Level parameter (L8 through L1 weighted loops). The weighting
at each level loop is defined by the weight parameter for each child.
Child Offered Within CIR and Above CIR Load
Limited by Child Maximum Rate (PIR)
Child Served Within CIR Loop According to
Provisioned CIR-Level
CIR-Weight Determines Ratio of Bandwidth for
Child When Multiple Children Are Mapped to
Same Within CIR Loop
Child
Scheduler
OR
Child
Queue
Child Served By Above CIR Loop According to
Provisioned Level
Weight Determines Ratio of Bandwidth for
Child When Multiple Children Are Mapped to
Same Above CIR Loop
Legend
Prioritizing Loop (Weighted or Strict)
Maximum and Committed
Rate Parameters
Bandwidth Dependency Association
Bandwidth Allocation
66
depicts how child queues and schedulers interact with their parent scheduler to
Figure 9: Virtual Scheduler Internal Bandwidth Allocation
Child Undefined CIR
Level Forces All
Offered Load For
Child to be Treated as
Above CIR Level
and Weight
CIRL
8
CIRL
7
CIRL
6
Within
CIRL
CIR
5
StrictLoop
High
Priority
CIRL
4
CIRL
3
CIRL
2
Scheduler CIR Based on
CIRL Provisioned Value or
1
Sum of Child CIR Values
Scheduler Rate (PIR)
L8
Based on Provisioned
Value
L7
L6
Above
L5
CIR
StrictLoop
Low
Priority
L4
L3
L2
L1
Scheduler
Loop Within
Policy
Rate Limiting Strict Loop
Receives Bandwidth
According to it's Offered
Load Within CIR and
Offered Load Above CIR
Rate
Limiting
StrictLoop
Rate Limiting Strict Loop
Distributes Available
Bandwidth to Each Child
According to Child
Offered Load Within and
Offered Load Above
Child CIR
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Quality of Service Guide