Split an S-Series Stack................................................................................................................ 968
S-Series Stacking Configuration Tasks............................................................................................ 968
Assigning Unit Numbers to Units in an S-Series Stack..............................................................969
Creating a Virtual Stack Unit on an S-Series Stack....................................................................969
Displaying Information about an S-Series Stack....................................................................... 969
Influencing Management Unit Selection on an S-Series Stack.................................................972
Managing Redundancy on an S-Series Stack............................................................................ 972
Resetting a Unit on an S-Series Stack........................................................................................ 973
Verify a Stack Configuration.............................................................................................................973
Displaying the Status of Stacking Ports......................................................................................973
Remove Units or Front End Ports from a Stack...............................................................................975
Removing a Unit from an S-Series Stack................................................................................... 975
Removing Front End Port Stacking............................................................................................ 975
Troubleshoot an S-Series Stack....................................................................................................... 976
Recover from Stack Link Flaps....................................................................................................976
Recover from a Card Problem State on an S-Series Stack........................................................977
Recover from a Card Mismatch State on an S-Series Stack......................................................977
53 Storm Control.................................................................................................980
Configure Storm Control................................................................................................................. 980
Configuring Storm Control from INTERFACE Mode.................................................................980
Configuring Storm Control from CONFIGURATION Mode......................................................980
54 Spanning Tree Protocol (STP)......................................................................982
Protocol Overview............................................................................................................................982
Configure Spanning Tree................................................................................................................. 982
Related Configuration Tasks...................................................................................................... 982
Important Points to Remember....................................................................................................... 983
Configuring Interfaces for Layer 2 Mode........................................................................................ 984
Enabling Spanning Tree Protocol Globally......................................................................................985
Adding an Interface to the Spanning Tree Group........................................................................... 987
Modifying Global Parameters...........................................................................................................988
Modifying Interface STP Parameters............................................................................................... 989
Enabling PortFast..............................................................................................................................990
Prevent Network Disruptions with BPDU Guard.......................................................................990
Selecting STP Root........................................................................................................................... 993
STP Root Guard................................................................................................................................ 993
Root Guard Scenario.................................................................................................................. 994
Configuring Root Guard.............................................................................................................995
Enabling SNMP Traps for Root Elections and Topology Changes.................................................995
Configuring Spanning Trees as Hitless............................................................................................ 996
STP Loop Guard................................................................................................................................996
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