Setup Guide

Split a Stack............................................................................................................................................................. 995
Stacking Conguration Tasks.......................................................................................................................................995
Assigning Unit Numbers to Units in an Stack...................................................................................................... 996
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 996
Displaying Information about a Stack....................................................................................................................996
Inuencing Management Unit Selection on a Stack........................................................................................... 999
Managing Redundancy on a Stack........................................................................................................................999
Resetting a Unit on a Stack..................................................................................................................................1000
Enabling Mixed-mode Stacking............................................................................................................................1000
Verify a Stack Conguration........................................................................................................................................1001
Displaying the Status of Stacking Ports...............................................................................................................1001
Remove Units or Front End Ports from a Stack...................................................................................................... 1002
Removing a Unit from a Stack..............................................................................................................................1002
Removing Front End Port Stacking..................................................................................................................... 1003
Troubleshoot a Stack...................................................................................................................................................1004
Recover from Stack Link Flaps.............................................................................................................................1004
Recover from a Card Problem State on a Stack................................................................................................1004
54 Storm Control........................................................................................................................................ 1006
Congure Storm Control.............................................................................................................................................1006
Conguring Storm Control from INTERFACE Mode......................................................................................... 1006
Conguring Storm Control from CONFIGURATION Mode...............................................................................1007
55 Spanning Tree Protocol (STP)................................................................................................................1008
Protocol Overview....................................................................................................................................................... 1008
Congure Spanning Tree.............................................................................................................................................1009
Related Conguration Tasks................................................................................................................................. 1009
Important Points to Remember..................................................................................................................................1009
Conguring Interfaces for Layer 2 Mode...................................................................................................................1010
Enabling Spanning Tree Protocol Globally...................................................................................................................1011
Adding an Interface to the Spanning Tree Group......................................................................................................1013
Modifying Global Parameters...................................................................................................................................... 1013
Modifying Interface STP Parameters......................................................................................................................... 1014
Enabling PortFast..........................................................................................................................................................1014
Prevent Network Disruptions with BPDU Guard................................................................................................1015
Selecting STP Root.......................................................................................................................................................1017
STP Root Guard............................................................................................................................................................ 1017
Root Guard Scenario.............................................................................................................................................. 1017
Conguring Root Guard......................................................................................................................................... 1018
Enabling SNMP Traps for Root Elections and Topology Changes..........................................................................1019
Conguring Spanning Trees as Hitless....................................................................................................................... 1019
STP Loop Guard............................................................................................................................................................1019
Conguring Loop Guard......................................................................................................................................... 1021
Displaying STP Guard Conguration...........................................................................................................................1021
56 SupportAssist.........................................................................................................................................1023
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