Concept Guide

Stack Management Roles....................................................................................................................................... 913
Stack Master Election..............................................................................................................................................914
Virtual IP.................................................................................................................................................................... 915
Failover Roles............................................................................................................................................................915
MAC Addressing on Stacks.....................................................................................................................................915
Stacking LAG............................................................................................................................................................ 916
Supported Stacking Topologies.............................................................................................................................. 917
High Availability on Stacks.......................................................................................................................................917
Management Access on Stacks............................................................................................................................. 917
Important Points to Remember.................................................................................................................................... 918
Stacking Installation Tasks.............................................................................................................................................918
Create a Stack.......................................................................................................................................................... 918
Add Units to an Existing Stack...............................................................................................................................923
Split a Stack............................................................................................................................................................. 925
Stacking Conguration Tasks.......................................................................................................................................925
Assigning Unit Numbers to Units in an Stack...................................................................................................... 926
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 926
Displaying Information about a Stack....................................................................................................................926
Inuencing Management Unit Selection on a Stack........................................................................................... 928
Managing Redundancy on a Stack........................................................................................................................929
Resetting a Unit on a Stack....................................................................................................................................929
Verify a Stack Conguration........................................................................................................................................ 929
Displaying the Status of Stacking Ports............................................................................................................... 930
Remove Units or Front End Ports from a Stack.........................................................................................................931
Removing a Unit from a Stack................................................................................................................................931
Removing Front End Port Stacking.......................................................................................................................932
Troubleshoot a Stack.....................................................................................................................................................932
Recover from Stack Link Flaps.............................................................................................................................. 933
Recover from a Card Problem State on a Stack..................................................................................................933
52 Storm Control..........................................................................................................................................935
Congure Storm Control...............................................................................................................................................935
Conguring Storm Control from INTERFACE Mode...........................................................................................935
Conguring Storm Control from CONFIGURATION Mode................................................................................936
53 Spanning Tree Protocol (STP)................................................................................................................. 937
Protocol Overview......................................................................................................................................................... 937
Congure Spanning Tree...............................................................................................................................................938
Related Conguration Tasks................................................................................................................................... 938
Important Points to Remember................................................................................................................................... 938
Conguring Interfaces for Layer 2 Mode....................................................................................................................939
Enabling Spanning Tree Protocol Globally.................................................................................................................. 940
Adding an Interface to the Spanning Tree Group...................................................................................................... 942
Modifying Global Parameters....................................................................................................................................... 942
Modifying Interface STP Parameters..........................................................................................................................943
Enabling PortFast.......................................................................................................................................................... 943
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