x
Policy Map Configuration Example 135
Step 3: Attaching the Service Policy 137
Summary 140
Chapter 6 QoS Features Available on the Catalyst 2950 and 3550 Family of Switches 143
Catalyst 2950 and Catalyst 3550 Family of Switches QoS Architectural Overview 144
Software Requirements 147
Input Scheduling 149
Classification and Marking 150
Internal DSCP and Mapping Tables 150
Ingress Port CoS Configuration 152
Trust DSCP 154
Trust IP Precedence 155
Voice VLANs and Extended Trust 156
Trust Cisco IP Phone Device 156
Classifying Traffic by Using ACLs 157
Classification Passthrough Option 159
Ingress DSCP Mutation 160
Policing 162
Policing Resources and Guidelines 163
Class Maps and Policy Maps 163
Ingress and Egress Policing 164
Individual and Aggregate Policing 166
Port-Based, VLAN-Based, and Per-Port Per-VLAN-Based Policing 168
Policing Actions 169
Congestion Management and Avoidance 175
Congestion Management with the Catalyst 2950 and 3550 Family of Switches 176
Congestion Avoidance with the 3550 Family of Switches 181
Transmit Queue Size 185
Auto-QoS 187
Auto-QoS Classification 187
Auto-QoS Congestion Management 188
Case Study 191
Summary 196
Chapter 7 QoS Features Available on the Catalyst 4000 IOS Family of Switches and the
Catalyst G-L3 Family of Switches 199
QoS Support on the Catalyst 4000 IOS Family of Switches 200
Catalyst 4000 IOS Family of Switches QoS Architectural Overview 201
Software Requirements 202