Getting Started...................................................................................................................................... 15

About This Guide................................................................................................................................................15

Alcatel-Lucent SR-Series Router Services Configuration Process ....................................................................15

QoS Policies ......................................................................................................................................... 17

In This Chapter ...................................................................................................................................................17

QoS Overview ....................................................................................................................................................17

Forwarding Classes.......................................................................................................................................18

High Priority Classes ................................................................................................................................19

Assured Classes ......................................................................................................................................20

Best-Effort Classes ..................................................................................................................................20

Queue Parameters .............................................................................................................................................21

Queue ID ......................................................................................................................................................21

Unicast or Multipoint Queue ..........................................................................................................................21

Queue Hardware Scheduler ..........................................................................................................................22

Committed Information Rate ........................................................................................................................22

Peak Information Rate...................................................................................................................................23

Adaptation Rule .............................................................................................................................................24

Committed Burst Size ...................................................................................................................................25

Maximum Burst Size .....................................................................................................................................26

High Priority Only Buffers ..............................................................................................................................26

Hi-Low Priority Only Buffers ..........................................................................................................................27

WRED Per Queue .........................................................................................................................................27

Native Queue Mode .................................................................................................................................28

Pool per Queue Mode ..............................................................................................................................31

Packet Markings............................................................................................................................................34

Queue Counters ............................................................................................................................................35

Queue-Types.................................................................................................................................................36

Color Aware Profiling.....................................................................................................................................36

QoS Policies .......................................................................................................................................................37

Service versus Network QoS ........................................................................................................................40

QoS Policy Entities ........................................................................................................................................41

Network QoS Policies....................................................................................................................................42

Network Queue QoS Policies ........................................................................................................................44

Service Ingress QoS Policies ........................................................................................................................47

FC Mapping Based on EXP Bits at VLL/VPLS SAP ................................................................................50

Egress Forwarding Class Override ..........................................................................................................53

Service Egress QoS Policies.........................................................................................................................54

Named Pool Policies .....................................................................................................................................56

Slope Policies................................................................................................................................................58

RED Slopes..............................................................................................................................................59

Tuning the Shared Buffer Utilization Calculation......................................................................................62

Slope Policy Parameters ..........................................................................................................................64

Scheduler Policies.........................................................................................................................................65

Virtual Hierarchical Scheduling ................................................................................................................67

Tiers .........................................................................................................................................................68

Quality of Service Guide