Administrator Guide

Removing a Unit from a Stack................................................................................................................................913
Removing Front End Port Stacking........................................................................................................................914
Troubleshoot a Stack..................................................................................................................................................... 914
Recover from Stack Link Flaps...............................................................................................................................915
Recover from a Card Problem State on a Stack.................................................................................................. 915
53 Storm Control...........................................................................................................................................917
Congure Storm Control................................................................................................................................................917
Conguring Storm Control from INTERFACE Mode............................................................................................917
Conguring Storm Control from CONFIGURATION Mode.................................................................................918
54 Spanning Tree Protocol (STP)..................................................................................................................919
Protocol Overview..........................................................................................................................................................919
Congure Spanning Tree.............................................................................................................................................. 920
Related Conguration Tasks...................................................................................................................................920
Important Points to Remember................................................................................................................................... 920
Conguring Interfaces for Layer 2 Mode.................................................................................................................... 921
Enabling Spanning Tree Protocol Globally...................................................................................................................922
Adding an Interface to the Spanning Tree Group...................................................................................................... 924
Modifying Global Parameters....................................................................................................................................... 924
Modifying Interface STP Parameters..........................................................................................................................925
Enabling PortFast.......................................................................................................................................................... 925
Prevent Network Disruptions with BPDU Guard.................................................................................................926
Selecting STP Root....................................................................................................................................................... 928
STP Root Guard.............................................................................................................................................................928
Root Guard Scenario............................................................................................................................................... 928
Conguring Root Guard..........................................................................................................................................929
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................930
Conguring Spanning Trees as Hitless........................................................................................................................930
STP Loop Guard............................................................................................................................................................ 930
Conguring Loop Guard..........................................................................................................................................932
Displaying STP Guard Conguration........................................................................................................................... 932
55 SupportAssist..........................................................................................................................................934
Conguring SupportAssist Using a Conguration Wizard........................................................................................935
Conguring SupportAssist Manually........................................................................................................................... 935
Conguring SupportAssist Activity..............................................................................................................................937
Conguring SupportAssist Company..........................................................................................................................938
Conguring SupportAssist Person.............................................................................................................................. 939
Conguring SupportAssist Server...............................................................................................................................939
Viewing SupportAssist Conguration......................................................................................................................... 940
56 System Time and Date.............................................................................................................................942
Network Time Protocol.................................................................................................................................................942
Protocol Overview...................................................................................................................................................943
Congure the Network Time Protocol..................................................................................................................943
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