Cisco ASR 9000 Series User manual

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Cisco ASR 9000 Series Aggregation
Services Router Modular Quality of
Service Configuration Guide
Cisco IOS XR Software Release 4.0.0
December, 2010
Text Part Number: OL-23108-02

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Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
© 2010 Cisco Systems, Inc. All rights reserved.

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CONTENTS
Preface QC-xi
Changes to This Document QC-xii
Obtaining Documentation and Submitting a Service Request QC-xiv
Modular QoS Overview on Cisco ASR 9000 Series Routers QC-1
Contents QC-1
Information About Modular Quality of Service on Cisco ASR 9000 Series Routers QC-1
Benefits of Cisco ASR 9000 Series Routers QoS Features QC-2
QoS Techniques on Cisco ASR 9000 Series Routers QC-2
Differentiated Service Model for Cisco IOS XR Software QC-4
Access Node Control Protocol QC-4
Additional Cisco IOS XR QoS Supported Features QC-5
Where to Go Next QC-5
Additional References QC-6
Related Documents QC-6
Standards QC-6
MIBs QC-6
RFCs QC-6
Technical Assistance QC-7
Configuring Modular QoS Service Packet Classification and Marking on
Cisco ASR 9000 Series Routers QC-9
Contents QC-10
Prerequisites for Configuring Modular QoS Packet Classification and Marking on
Cisco ASR 9000 Series Routers QC-10
Information About Configuring Modular QoS Packet Classification and Marking on
Cisco ASR 9000 Series Routers QC-11
Packet Classification Overview QC-11
Traffic Class Elements QC-11
Traffic Policy Elements QC-12
Default Traffic Class QC-12
Bundle Traffic Policies QC-13
Shared Policy Instance QC-13
Port Shape Policies QC-14

Contents
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Class-based Unconditional Packet Marking Feature and Benefits QC-14
Specification of the CoS for a Packet with IP Precedence QC-15
Classification Based on DEI QC-17
IP Precedence Compared to IP DSCP Marking QC-17
In-Place Policy Modification QC-17
How to Configure Modular QoS Packet Classification and Marking on
Cisco ASR 9000 Series Routers QC-19
Creating a Traffic Class QC-19
Creating a Traffic Policy QC-22
Attaching a Traffic Policy to an Interface QC-24
Configuring Shared Policy Instance QC-26
Configuring Class-based Unconditional Packet Marking QC-29
Configuration Examples for Configuring Modular QoS Packet Classification and Marking on
Cisco ASR 9000 Series Routers QC-33
Traffic Classes Defined: Example QC-33
Traffic Policy Created: Example QC-33
Traffic Policy Attached to an Interface: Example QC-34
Traffic Policy Attached to Multiple Subinterfaces: Example QC-34
Traffic Policy Attached to a Bundle Interface: Example QC-34
EFP Load Balancing with Shared Policy Instance: Example QC-35
Default Traffic Class Configuration: Example QC-35
class-map match-any Command Configuration: Example QC-35
Class-based, Unconditional Packet Marking Examples QC-36
In-Place Policy Modification: Example QC-38
Additional References QC-40
Related Documents QC-40
Standards QC-40
MIBs QC-40
RFCs QC-40
Technical Assistance QC-41
QC-41
Configuring Modular QoS Congestion Management on Cisco ASR 9000 Series Routers QC-43
Contents QC-44
Prerequisites for Configuring QoS Congestion Management on Cisco ASR 9000 Series Routers QC-44
Information About Configuring QoS Congestion Management on Cisco ASR 9000 Series Routers QC-45
Congestion Management Overview QC-45
Modified Deficit Round Robin QC-46
Low-Latency Queueing with Strict Priority Queueing QC-46
Traffic Shaping QC-47

Contents
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Traffic-Shaping Mechanism Regulates Traffic QC-47
Traffic Policing QC-48
Regulation of Traffic with the Policing Mechanism QC-49
Traffic Shaping Versus Traffic Policing QC-50
Congestion Management Using DEI QC-50
How to Configure QoS Congestion Management on Cisco ASR 9000 Series Routers QC-51
Configuring Guaranteed and Remaining Bandwidths QC-51
Configuring Low-Latency Queueing with Strict Priority Queueing QC-57
Configuring Traffic Shaping QC-60
Configuring Traffic Policing QC-62
Configuration Examples for Configuring QoS Congestion Management on
Cisco ASR 9000 Series Routers QC-68
Traffic Shaping for an Input Interface: Example QC-68
Traffic Policing for a Bundled Interface: Example QC-69
Hierarchical Policing: Example QC-69
Multi-action Set/Policer: Example QC-70
QC-70
Additional References QC-71
Related Documents QC-71
Standards QC-71
MIBs QC-71
RFCs QC-71
Technical Assistance QC-72
Configuring Modular QoS Congestion Avoidance on Cisco ASR 9000 Series Routers QC-73
Contents QC-73
Prerequisites for Configuring Modular QoS Congestion Avoidance on
Cisco ASR 9000 Series Routers QC-74
Information About Configuring Modular QoS Congestion Avoidance on
Cisco ASR 9000 Series Routers QC-74
Random Early Detection and TCP QC-74
Weighted Random Early Detection for Preferential Traffic Handling QC-74
Tail Drop and the FIFO Queue QC-76
How to Configure Modular QoS Congestion Avoidance on Cisco ASR 9000 Series Routers QC-76
Configuring Random Early Detection QC-76
Configuring Weighted Random Early Detection QC-79
Configuring Tail Drop QC-82
Additional References QC-86
Related Documents QC-86
Standards QC-86

Contents
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MIBs QC-86
RFCs QC-86
Technical Assistance QC-87
QC-87
Configuring Access Node Control Protocol
on Cisco ASR 9000 Series Routers QC-89
Contents QC-89
Prerequisites for Configuring ANCP on Cisco ASR 9000 Series Routers QC-90
Restrictions for Configuring ANCP on Cisco ASR 9000 Series Routers QC-90
Information About Configuring ANCP on Cisco ASR 9000 Series Routers QC-90
ANCP Adjacencies QC-90
Neighbor Adjacency Timing QC-91
ANCP Messages QC-91
Port Mapping QC-91
Rate Adjustment QC-92
Prioritization of ANCP Traffic QC-92
Process Restart QC-92
ANCP and QoS Interaction QC-92
ANCP over Multi-Chassis Link Aggregation QC-93
How to Configure ANCP on Cisco ASR 9000 Series Routers QC-94
Enabling ANCP QC-94
Configuring ANCP Server Sender Name QC-96
Configuring ANCP Neighbors QC-97
Mapping AN Ports to VLAN Subinterfaces QC-100
Configuring ANCP Rate Adjustment QC-102
Configuration Examples for Configuring ANCP on Cisco ASR 9000 Series Routers QC-104
Configuring ANCP Server Sender Name: Example QC-105
Configuring ANCP Neighbors: Example QC-105
Mapping AN ports to VLAN Subinterfaces: Example QC-108
Configuring ANCP Rate Adjustment: Example QC-109
ANCP and QoS Interaction: Example QC-111
QoS Policy Inconsistency on an Interface: Example QC-114
Additional References QC-120
Related Documents QC-120
Standards QC-120
MIBs QC-120
RFCs QC-120
Technical Assistance QC-121
QC-121

Contents
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Configuring Hierarchical Modular QoS on Cisco ASR 9000 Series Routers QC-123
Contents QC-124
Information About Hierarchical QoS QC-124
Benefits of Hierarchical Policies QC-124
Restrictions for Hierarchical Policies QC-125
Sample Scenarios of Hierarchical Policies QC-126
Two-Level Hierarchical Policies QC-126
Three-Level Hierarchical Policies QC-127
Processing Order for Actions in Hierarchical Policies QC-128
Three-Parameter Scheduler QC-129
Hierarchical Policing QC-130
How to Configure Hierarchical QoS QC-131
Configuring the Three-Parameter Scheduler QC-132
Policing Traffic at Two Levels of Hierarchy QC-137
Attaching Hierarchical Policies to Physical and Virtual Links QC-139
Configuring Enhanced Hierarchical Ingress Policing QC-141
Configuration Examples for Hierarchical QoS QC-143
Two-Level Hierarchical Queueing Policy: Example QC-143
Three-Level Hierarchical Queueing Policy: Examples QC-144
Three-Parameter Scheduler: Examples QC-148
Hierarchical Policing: Examples QC-149
Attaching Service Policies to Physical and Virtual Links: Examples QC-150
Enhanced Hierarchical Ingress Policing: Example QC-150
Verifying the Configuration of Hierarchical Policies QC-151
Additional References QC-152
Related Documents QC-152
Standards QC-152
MIBs QC-152
RFCs QC-152
Technical Assistance QC-153
QC-153
Configuring Modular QoS on Link Bundles on Cisco ASR 9000 Series Routers QC-155
Contents QC-155
Link Bundling Overview QC-155
Load Balancing QC-156
Layer 3 Load Balancing on Link Bundles QC-156
QoS and Link Bundling QC-157
Additional References QC-158

Contents
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Related Documents QC-158
Standards QC-158
MIBs QC-158
RFCs QC-158
Technical Assistance QC-159
QC-159
Modular QoS Deployment Scenarios on Cisco ASR 9000 Series Routers QC-161
Contents QC-162
802.1ad DEI QC-162
Mark DEI Based on a Policing Action: Example QC-163
Mark DEI Based on Incoming Fields: Example QC-163
Congestion Management Using DEI: Example QC-163
Frame Relay QoS QC-163
Frame Relay DLCI Classification QC-164
Frame Relay DE Classification QC-164
Frame Relay DE Marking QC-164
Frame Relay QoS: Example QC-165
IP Header Compression QoS QC-167
IP Header Compression QoS: Example QC-168
L2VPN QoS QC-168
Frame Relay <-> Frame Relay Over Pseudowire: Example QC-168
Frame Relay <-> Ethernet Over Pseudowire: Example QC-170
MLPPP QoS/MLFR QoS QC-171
Multiclass MLPPP with QoS QC-172
MLPPP QoS/MLFR QoS: Example QC-173
MPLS QoS QC-175
MPLS Uniform Mode QC-176
MPLS Pipe Mode QC-176
MPLS Short Pipe Mode QC-177
Uniform, Pipe, Short Pipe Modes: Ingress PE Example QC-177
Uniform Mode: Egress PE Example QC-178
Pipe Mode: Egress PE Example QC-179
Short Pipe Mode: Egress PE Example QC-179
QoS on Multicast VPN QC-180
ASR 9000 Ethernet Line Cards QC-180
SIP 700 for the ASR 9000 QC-182
QoS on NxDS0 Interfaces QC-182
One-Level Policy Applied to Main Interface: Example QC-183

Contents
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Two-Level Policy Applied to a Subinterface: Example QC-183
Related Information QC-184
Index

Contents
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