Cisco ASR 9000 Series User manual

Cisco ASR 9000 Series Aggregation Services Router Modular Quality
of Service Configuration Guide, Release 6.1.x
First Published: 2016-11-01
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CONTENTS
Preface Preface xv
Changes to this Document xv
Obtaining Documentation and Submitting a Service Request xv
CHAPTER 1 New and Changed QoS Features 1
New and Changed QoS Features 1
CHAPTER 2 Modular QoS Overview 3
Information About Modular Quality of Service Overview 3
Benefits of Cisco IOS XR QoS Features 3
QoS Techniques 4
Packet Classification and Marking 4
Default Marking Behavior 5
Congestion Management 5
Congestion Avoidance 6
Differentiated Service Model for Cisco IOS XR Software 6
Access Node Control Protocol 6
Additional Cisco IOS XR QoS Supported Features 7
Modular QoS Command-Line Interface 7
Fabric QoS 7
Where to Go Next 7
Additional References 7
Related Documents 8
Standards 8
MIBs 8
RFCs 9
Technical Assistance 9
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CHAPTER 3 Configuring Access Node Control Protocol 11
Prerequisites for Configuring ANCP 12
Restrictions for Configuring ANCP 12
Information About Configuring ANCP 12
ANCP Adjacencies 12
Neighbor Adjacency Timing 12
ANCP Messages 13
Port Mapping 13
Rate Adjustment 13
Prioritization of ANCP Traffic 14
Process Restart 14
ANCP and QoS Interaction 14
Multi Chassis Link Aggregation 14
ANCP over MC-LAG 15
How to Configure ANCP on Cisco 16
Enabling ANCP 16
Configuring ANCP Server Sender Name 17
Configuring ANCP Neighbors 18
Mapping AN Ports to VLAN Subinterfaces 20
Configuring ANCP Rate Adjustment 23
Configuration Examples for Configuring ANCP contains the following examples: 24
Configuring ANCP Server Sender Name: Example 24
Configuring ANCP Neighbors: Example 24
Mapping AN ports to VLAN Subinterfaces: Example 27
Configuring ANCP Rate Adjustment: Example 28
ANCP and QoS Interaction: Example 28
QoS Policy Inconsistency on an Interface: Example 31
ANCP Rate Change 33
Port Speed Change 34
The show qos inconsistency Command: Example 35
Additional References 36
Related Documents 36
Standards 36
MIBs 36
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RFCs 37
Technical Assistance 37
Configuring Access Node Control Protocol 37
CHAPTER 4 Configuring Modular QoS Congestion Avoidance 39
Prerequisites for Configuring Modular QoS Congestion Avoidance 40
Information About Configuring Modular QoS Congestion Avoidance 40
Random Early Detection and TCP 40
Queue-limit for WRED 40
Tail Drop and the FIFO Queue 41
Configuring Random Early Detection 41
Configuring Weighted Random Early Detection 43
Configuring Tail Drop 46
Additional References 49
Related Documents 49
Standards 49
MIBs 50
RFCs 50
Technical Assistance 50
CHAPTER 5 Configuring Modular QoS Congestion Management 51
Prerequisites for Configuring QoS Congestion Management 52
Information About Configuring Congestion Management 53
Congestion Management Overview 53
Modified Deficit Round Robin 53
Low-Latency Queueing with Strict Priority Queueing 54
Configured Accounting 54
QoS for IPv6 ACLs 55
Traffic Shaping 55
Regulation of Traffic with the Shaping Mechanism 55
Traffic Policing 56
Regulation of Traffic with the Policing Mechanism 57
Single-Rate Policer 57
Two-Rate Policer 58
Committed Bursts and Excess Bursts 60
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Committed Bursts 60
Committed Burst Calculation 61
Excess Bursts 61
Excess Burst Calculation 61
Deciding if Packets Conform or Exceed the Committed Rate 62
Two-Rate Three-Color (2R3C) Policer 62
Hierarchical Policing 63
Multiple Action Set 63
Packet Marking Through the IP Precedence Value, IP DSCP Value, and the MPLS
Experimental Value Setting 63
Traffic Policing on Layer 2 ATM Interfaces 64
Restrictions 65
Traffic Policing on a Layer 2 ATM interface: Example 65
Explicit Congestion Notification 65
Implementing ECN 66
Packet Handling when ECN is enabled 66
QoS for Bridge-Group Virtual Interfaces 67
QoS on BVI 67
Restrictions 67
Classification and Marking for BVI 68
Policer Granularity and Shaper Granularity 68
Congestion Management Using DEI 68
How to Configure QoS Congestion Management 69
Configuring Guaranteed and Remaining Bandwidths 69
Configuring Guaranteed Bandwidth 72
Configuring Bandwidth Remaining 75
Configuring Low-Latency Queueing with Strict Priority Queueing 78
Configuring Traffic Shaping 80
Configuring Traffic Policing (Two-Rate Color-Blind) 82
Configuring Traffic Policing (2R3C) 85
Configuring Hierarchical Policing 88
Traffic Policing for BVI 89
Configuring ECN 93
Configuration Examples for Configuring Congestion Management 95
Service Fragment Configurations: Example 95
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Traffic Policing for BVI: Example 95
ECN: Example 96
Hierarchical Policing: Example 96
Additional References 96
Related Documents 96
Standards 97
MIBs 97
RFCs 97
Technical Assistance 97
CHAPTER 6 Configuring Modular QoS Service Packet Classification 99
Prerequisites for Configuring Modular QoS Packet Classification 101
Information About Configuring Modular QoS Packet Classification 101
Packet Classification Overview 101
Traffic Class Elements 102
Traffic Policy Elements 102
Default Traffic Class 103
Bundle Traffic Policies 103
Shared Policy Instance 103
Policy Inheritance 104
Port Shape Policies 104
Support for 16 Queues 104
Class-based Unconditional Packet Marking Feature and Benefits 105
Specification of the CoS for a Packet with IP Precedence 106
IP Precedence Bits Used to Classify Packets 107
IP Precedence Value Settings 108
Classification Based on DEI 108
Default DEI Marking 108
TCP Establishment DSCP Marking/ Set IP Precedence/DSCP for NTP 109
IP Precedence Compared to IP DSCP Marking 109
Configuring DSCP for source IPv4 address for NTP Packets 109
Configure DSCP CS7 (Precedence 7) 112
Configure IPv4 DSCP Precedence 112
Configure IPv6 DSCP precedence 114
QoS Policy Propagation Using Border Gateway Protocol 116
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QoS on PWHE 117
Supported Features 117
Limitations 118
Bandwidth Distribution 118
Classification and Marking Support 118
Policing and Queuing support 121
Co-existence of PWHE Main and Subinterface Policies 122
PW-Ether Subinterface Policy 123
PW-Ether Subinterface Shared Policy Instance 123
Scale Information 124
Policy Instantiation 124
PWHE without QoS policy 125
Configuring QoS on PWHE: Example. 126
Port Shaper Policy Support on L2 Fabric ICL Interface 127
Configuring Port Shaper Policy on the ICL Interface in L2 Fabric Mode 128
Ingress Queuing Support 129
In-Place Policy Modification 132
Recommendations for Using In-Place Policy Modification 133
Dynamic Modification of Interface Bandwidth 133
Policy States 133
Inter-Class Policer Bucket Sharing 133
Policer Bucket Shared 133
Policer Bucket Referred 134
Interface Support 134
Classification Support for Ethernet-Services ACL 134
How to Configure Modular QoS Packet Classification 135
Creating a Traffic Class 135
Creating a Traffic Policy 138
Attaching a Traffic Policy to an Interface 140
Attaching a Shared Policy Instance to Multiple Subinterfaces 141
Attaching a Shared Policy Instance to Bundle Interfaces or EFP Bundles 142
Configuring Class-based Unconditional Packet Marking 143
Configuring QoS Policy Propagation Using Border Gateway Protocol 147
Policy Propagation Using BGP Configuration Task List 147
Overview of Tasks 147
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Defining the Route Policy 148
Applying the Route Policy to BGP 148
Configuring QPPB on the Desired Interfaces 149
Configuring QPPB on the GRE Tunnel Interfaces 150
QPPB Scenario 151
Configuring Hierarchical Ingress Policing 152
Configuring Policer Bucket Sharing 153
Overview of Multiple QoS Policy Support 156
Use Case —Multiple QoS Policy Support 156
Configuring Multiple QoS Policy Support 157
Restrictions for Multiple QoS Policy Support 160
Policy Combinations 161
Multi Policy and Interface Hierarchy 162
Statistics 166
Policy Modification 168
Supported Features by Multi Policies 169
Configuration Examples for Configuring Modular QoS Packet Classification 170
Traffic Classes Defined: Example 170
Traffic Policy Created: Example 170
Traffic Policy Attached to an Interface: Example 171
Traffic Policy Attached to Multiple Subinterfaces: Example 171
Traffic Policy Attached to a Bundle Interface: Example 171
EFP Load Balancing with Shared Policy Instance: Example 171
Configuring a Bundle Interface: Example 171
Configuring Two Bundle EFPs with the Load Balance Options: Example 172
Default Traffic Class Configuration: Example 172
class-map match-any Command Configuration: Example 172
Class-based Unconditional Packet Marking: Examples 172
IP Precedence Marking Configuration: Example 173
IP DSCP Marking Configuration: Example 173
QoS Group Marking Configuration: Example 173
CoS Marking Configuration: Example 174
MPLS Experimental Bit Imposition Marking Configuration: Example 174
MPLS Experimental Topmost Marking Configuration: Example 174
QoS Policy Propagation using BGP: Examples 175
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Applying Route Policy: Example 175
Applying QPPB on a Specific Interface: Example 175
Applying QPPB on a GRE Tunnel Interface: Example 175
In-Place Policy Modification: Example 176
Configuring Inter Class Policer Bucket Sharing: Example 177
Additional References 177
Related Documents 177
Standards 178
MIBs 178
RFCs 178
Technical Assistance 178
CHAPTER 7 Modular QoS Deployment Scenarios 179
802.1ad DEI 180
Mark DEI Based on a Policing Action: Example 181
Mark DEI Based on Incoming Fields: Example 181
Congestion Management Using DEI: Example 181
Frame Relay QoS 181
Frame Relay DLCI Classification 182
Frame Relay DE Classification 182
Frame Relay DE Marking 182
Frame Relay QoS: Example 183
IP Header Compression QoS 185
IP Header Compression QoS: Example 186
L2VPN QoS 186
Frame Relay <-> Frame Relay Over Pseudowire: Example 186
Frame Relay <-> Ethernet Over Pseudowire: Example 188
MLPPP QoS/MLFR QoS 189
Multiclass MLPPP with QoS 190
MLPPP QoS/MLFR QoS: Example 191
MPLS QoS 191
MPLS Uniform Mode 192
MPLS Pipe Mode 192
MPLS Short Pipe Mode 193
Uniform, Pipe, Short Pipe Modes: Ingress PE Example 193
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