Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch

Cisco

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Contents

Fundamental Spanning-Tree Concepts ................................................................................................................. 3

MST Compared to Rapid PVST+ .......................................................................................................................... 3

MST Concepts ...................................................................................................................................................... 4

Instances .......................................................................................................................................................... 5

Regions ............................................................................................................................................................ 5

MST Configuration Best Practices ........................................................................................................................ 8

VLAN Ranges in Cisco NX-OS Software ................................................................................................................ 9

VLAN Ranges and MST Regions .......................................................................................................................... 9

Special Considerations for Spanning Tree with vPCs ........................................................................................ 10

How Spanning Tree Works in a vPC Deployment ............................................................................................... 10

Spanning-Tree Port Roles in Sample vPC Topologies ................................................................................... 11

Type-1 Misconfiguration: Global and Interface Specific ...................................................................................... 13

Rapid PVST+ and vPC Best Practices ................................................................................................................ 15

MST and vPC Best Practices .............................................................................................................................. 15

EtherChannel Misconfiguration Guard ................................................................................................................ 15

Pathcost Method Long .......................................................................................................................................... 17

Scaling Considerations ......................................................................................................................................... 17

Logical Interfaces or BPDU States ...................................................................................................................... 17

Spanning-Tree Scalability with vPC Compared to Non-vPC Designs ............................................................ 18

Summary Checklist for Spanning Tree in a vPC Deployment ........................................................................... 19