User's Manual

Table Of Contents
MST Overview 89
MST Regions 90
MST BPDUs 90
MST Configuration Information 91
IST, CIST, and CST 91
IST, CIST, and CST Overview 91
Spanning Tree Operation Within an MST Region 92
Spanning Tree Operations Between MST Regions 92
MST Terminology 93
Hop Count 94
Boundary Ports 94
Spanning-Tree Dispute Mechanism 95
Port Cost and Port Priority 96
Interoperability with IEEE 802.1D 96
Interoperability with Rapid PVST+: Understanding PVST Simulation 97
Configuring MST 97
MST Configuration Guidelines 97
Enabling MST 97
Entering MST Configuration Mode 98
Specifying the MST Name 99
Specifying the MST Configuration Revision Number 100
Specifying the Configuration on an MST Region 100
Mapping and Unmapping VLANs to MST Instances 102
Mapping Secondary VLANs to Same MSTI as Primary VLANs for Private VLANs 102
Configuring the Root Bridge 103
Configuring a Secondary Root Bridge 104
Configuring the Port Priority 105
Configuring the Port Cost 106
Configuring the Switch Priority 106
Configuring the Hello Time 107
Configuring the Forwarding-Delay Time 108
Configuring the Maximum-Aging Time 108
Configuring the Maximum-Hop Count 109
Configuring PVST Simulation Globally 109
Configuring PVST Simulation Per Port 110
Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
viii OL-26590-01
Contents