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Displaying the MSTP Configuration . . . . . . . . . . . . . . . . . . . . . . . 4-54
Troubleshooting an MSTP Configuration . . . . . . . . . . . . . . . . . . . . . . 4-58
Displaying the Change History of Root Bridges . . . . . . . . . . . . . . . . . 4-58
Displaying Debug Counters for All MST Instances . . . . . . . . . . . . . . . 4-61
Displaying Debug Counters for One MST Instance . . . . . . . . . . . . . . 4-62
Displaying Debug Counters for Ports in an MST Instance . . . . . . . . . 4-64
Field Descriptions in MSTP Debug Command Output . . . . . . . . . . . . 4-66
Troubleshooting MSTP Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69
Loop Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-70
Configuring Loop Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71
Viewing Loop Protection Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-72
5 Quality of Service (QoS): Managing Bandwidth More
Effectively
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Classifiers for Prioritizing Outbound Packets . . . . . . . . . . . . . . . . . . . 5-10
Packet Classifiers and Evaluation Order . . . . . . . . . . . . . . . . . . . 5-10
Preparation for Configuring QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Preserving 802.1p Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Steps for Configuring QoS on the Switch . . . . . . . . . . . . . . . . . . . . . . . 5-11
Viewing the QoS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
No Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Using QoS Classifiers to Configure
Quality of Service for Outbound Traffic . . . . . . . . . . . . . . . . . . . . . . . 5-14
QoS IP Type-of-Service (ToS) Policy and Priority . . . . . . . . . . . . . . . 5-15
Assigning an 802.1p Priority to IPv4 Packets on the Basis
of the ToS Precedence Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Assigning an 802.1p Priority to IPv4 Packets on the
Basis of Incoming DSCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Assigning a DSCP Policy on the Basis of the DSCP in IPv4
Packets Received from Upstream Devices . . . . . . . . . . . . . . . . . . 5-21
Details of QoS IP Type-of-Service . . . . . . . . . . . . . . . . . . . . . . . . . 5-24