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Removing a Stack Group from Stacking Mode.......................................................................................................... 918
Remove a Switch from a Stack.................................................................................................................................... 919
Adding a Stack Unit....................................................................................................................................................... 919
Adding a Standalone Switch to a Stack......................................................................................................................920
Merging Two Stacks......................................................................................................................................................920
Split a Stack.................................................................................................................................................................... 921
Managing Redundant Stack Management..................................................................................................................921
Resetting a Unit on a Stack.......................................................................................................................................... 921
Verify a Stack Conguration.........................................................................................................................................922
Using Show Commands..........................................................................................................................................922
Troubleshooting a Switch Stack.................................................................................................................................. 925
Failure Scenarios...................................................................................................................................................... 927
Upgrading a Switch Stack...................................................................................................................................... 929
Upgrading a Single Stack Unit............................................................................................................................... 930
56 Storm Control..........................................................................................................................................932
Congure Storm Control...............................................................................................................................................932
Conguring Storm Control from INTERFACE Mode...........................................................................................932
Conguring Storm Control from CONFIGURATION Mode................................................................................933
57 Spanning Tree Protocol (STP)................................................................................................................. 934
Protocol Overview.........................................................................................................................................................934
Congure Spanning Tree.............................................................................................................................................. 935
Related Conguration Tasks...................................................................................................................................935
Important Points to Remember............................................................................................................................. 935
Conguring Interfaces for Layer 2 Mode....................................................................................................................936
Enabling Spanning Tree Protocol Globally...................................................................................................................937
Adding an Interface to the Spanning Tree Group...................................................................................................... 939
Removing an Interface from the Spanning Tree Group............................................................................................ 939
Modifying Global Parameters....................................................................................................................................... 939
Modifying Interface STP Parameters..........................................................................................................................940
Enabling PortFast.......................................................................................................................................................... 940
Prevent Network Disruptions with BPDU Guard........................................................................................................941
Global BPDU Filtering....................................................................................................................................................943
Interface BPDU Filtering............................................................................................................................................... 943
Selecting STP Root....................................................................................................................................................... 944
STP Root Guard.............................................................................................................................................................944
Root Guard Scenario...............................................................................................................................................945
Conguring Root Guard..........................................................................................................................................946
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................946
Conguring Spanning Trees as Hitless........................................................................................................................946
STP Loop Guard.............................................................................................................................................................947
Conguring Loop Guard..........................................................................................................................................948
Displaying STP Guard Conguration........................................................................................................................... 949
58 SupportAssist..........................................................................................................................................950
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