Concept Guide

Creating a Virtual Stack Unit on a Stack.............................................................................................................. 983
Displaying Information about a Stack....................................................................................................................983
Inuencing Management Unit Selection on a Stack........................................................................................... 986
Managing Redundancy on a Stack........................................................................................................................986
Resetting a Unit on a Stack....................................................................................................................................987
Enabling Mixed-mode Stacking..............................................................................................................................987
Verify a Stack Conguration........................................................................................................................................ 988
Displaying the Status of Stacking Ports............................................................................................................... 988
Remove Units or Front End Ports from a Stack........................................................................................................989
Removing a Unit from a Stack...............................................................................................................................989
Removing Front End Port Stacking.......................................................................................................................990
Troubleshoot a Stack..................................................................................................................................................... 991
Recover from Stack Link Flaps...............................................................................................................................991
Recover from a Card Problem State on a Stack.................................................................................................. 991
54 Storm Control..........................................................................................................................................993
Congure Storm Control...............................................................................................................................................993
Conguring Storm Control from INTERFACE Mode...........................................................................................993
Conguring Storm Control from CONFIGURATION Mode................................................................................994
55 Spanning Tree Protocol (STP).................................................................................................................995
Protocol Overview.........................................................................................................................................................995
Congure Spanning Tree.............................................................................................................................................. 996
Related Conguration Tasks...................................................................................................................................996
Important Points to Remember................................................................................................................................... 996
Conguring Interfaces for Layer 2 Mode....................................................................................................................997
Enabling Spanning Tree Protocol Globally.................................................................................................................. 998
Adding an Interface to the Spanning Tree Group.....................................................................................................1000
Modifying Global Parameters..................................................................................................................................... 1000
Modifying Interface STP Parameters......................................................................................................................... 1001
Enabling PortFast......................................................................................................................................................... 1001
Prevent Network Disruptions with BPDU Guard............................................................................................... 1002
Selecting STP Root......................................................................................................................................................1004
STP Root Guard...........................................................................................................................................................1004
Root Guard Scenario............................................................................................................................................. 1004
Conguring Root Guard........................................................................................................................................ 1005
Enabling SNMP Traps for Root Elections and Topology Changes.........................................................................1006
Conguring Spanning Trees as Hitless...................................................................................................................... 1006
STP Loop Guard...........................................................................................................................................................1006
Conguring Loop Guard........................................................................................................................................ 1008
Displaying STP Guard Conguration..........................................................................................................................1008
56 SupportAssist......................................................................................................................................... 1010
Conguring SupportAssist Using a Conguration Wizard........................................................................................1011
Conguring SupportAssist Manually........................................................................................................................... 1011
Conguring SupportAssist Activity.............................................................................................................................1013
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