Quality of Service Guide 3
Table of Contents
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
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