January 2001
Intermediate to advanced
368 pages
11h 35m
English
Content preview from IP Quality of Service
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Flow-Based WFQ 75
Figure 4-6 Illustration of FQ Scheduler Behavior; Packet D1 Arriving After Packet A1 Is Scheduled
Flow-Based WFQ
In WFQ, weights are assigned based on their precedence value in the Internet Protocol (IP)
header. They are calculated as follows:
Weight = 4096 ÷ (IP precedence + 1)
500
484 356 228260
400 300 200 100
D1
(32)
Queue A
Queue D
D1
D1
.....
A3 A2
....
A2A3
260
356484
Queue A
Round number: 228
Queue D
Round number/sequence number
A3 A2 D1
An FQ scheduler
A3 (128)
A2 (128)
76 Chapter 4: Per-Hop Behavior: Resource Allocation I
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