Concept Guide

Assigning Unit Numbers to Units in an Stack...................................................................................................... 942
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 943
Displaying Information about a Stack....................................................................................................................943
Inuencing Management Unit Selection on a Stack........................................................................................... 945
Managing Redundancy on a Stack........................................................................................................................945
Resetting a Unit on a Stack....................................................................................................................................946
Verify a Stack Conguration........................................................................................................................................ 946
Displaying the Status of Stacking Ports............................................................................................................... 946
Remove Units or Front End Ports from a Stack........................................................................................................948
Removing a Unit from a Stack............................................................................................................................... 948
Removing Front End Port Stacking.......................................................................................................................949
Troubleshoot a Stack.....................................................................................................................................................949
Recover from Stack Link Flaps.............................................................................................................................. 949
Recover from a Card Problem State on a Stack................................................................................................. 950
Recover from a Card Mismatch State on a Stack...............................................................................................950
52 Storm Control..........................................................................................................................................952
Congure Storm Control...............................................................................................................................................952
Conguring Storm Control from INTERFACE Mode...........................................................................................952
Conguring Storm Control from CONFIGURATION Mode................................................................................953
53 Spanning Tree Protocol (STP)................................................................................................................. 954
Protocol Overview.........................................................................................................................................................954
Congure Spanning Tree.............................................................................................................................................. 955
Related Conguration Tasks...................................................................................................................................955
Important Points to Remember................................................................................................................................... 955
Conguring Interfaces for Layer 2 Mode................................................................................................................... 956
Enabling Spanning Tree Protocol Globally...................................................................................................................957
Adding an Interface to the Spanning Tree Group...................................................................................................... 959
Modifying Global Parameters.......................................................................................................................................959
Modifying Interface STP Parameters..........................................................................................................................960
Enabling PortFast.......................................................................................................................................................... 960
Prevent Network Disruptions with BPDU Guard................................................................................................. 961
Selecting STP Root....................................................................................................................................................... 963
STP Root Guard.............................................................................................................................................................963
Root Guard Scenario...............................................................................................................................................963
Conguring Root Guard..........................................................................................................................................964
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 965
Conguring Spanning Trees as Hitless........................................................................................................................965
STP Loop Guard............................................................................................................................................................ 965
Conguring Loop Guard..........................................................................................................................................967
Displaying STP Guard Conguration........................................................................................................................... 967
54 SupportAssist..........................................................................................................................................969
Conguring SupportAssist Using a Conguration Wizard........................................................................................ 970
Conguring SupportAssist Manually........................................................................................................................... 970
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