Concept Guide

50 Storm Control..........................................................................................................................................954
Congure Storm Control.............................................................................................................................................. 954
Conguring Storm Control from INTERFACE Mode...........................................................................................954
Conguring Storm Control from CONFIGURATION Mode................................................................................955
PFC Storm......................................................................................................................................................................955
Detect PFC Storm...................................................................................................................................................956
Restore Queue Drop State..................................................................................................................................... 956
View Details of Storm Control PFC.......................................................................................................................956
51 Spanning Tree Protocol (STP)..................................................................................................................958
Protocol Overview.........................................................................................................................................................958
Congure Spanning Tree.............................................................................................................................................. 959
Related Conguration Tasks...................................................................................................................................959
Important Points to Remember................................................................................................................................... 959
Conguring Interfaces for Layer 2 Mode................................................................................................................... 960
Enabling Spanning Tree Protocol Globally................................................................................................................... 961
Adding an Interface to the Spanning Tree Group...................................................................................................... 963
Modifying Global Parameters.......................................................................................................................................963
Modifying Interface STP Parameters..........................................................................................................................964
Enabling PortFast.......................................................................................................................................................... 964
Prevent Network Disruptions with BPDU Guard.................................................................................................965
Selecting STP Root....................................................................................................................................................... 967
STP Root Guard.............................................................................................................................................................967
Root Guard Scenario............................................................................................................................................... 967
Conguring Root Guard..........................................................................................................................................968
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 969
Conguring Spanning Trees as Hitless........................................................................................................................969
STP Loop Guard............................................................................................................................................................ 969
Conguring Loop Guard...........................................................................................................................................971
Displaying STP Guard Conguration............................................................................................................................ 971
52 SupportAssist.......................................................................................................................................... 973
Conguring SupportAssist Using a Conguration Wizard........................................................................................ 974
Conguring SupportAssist Manually............................................................................................................................974
Conguring SupportAssist Activity..............................................................................................................................976
Conguring SupportAssist Company.......................................................................................................................... 977
Conguring SupportAssist Person...............................................................................................................................978
Conguring SupportAssist Server............................................................................................................................... 978
Viewing SupportAssist Conguration..........................................................................................................................979
53 System Time and Date............................................................................................................................. 981
Network Time Protocol..................................................................................................................................................981
Protocol Overview...................................................................................................................................................982
Congure the Network Time Protocol..................................................................................................................982
Enabling NTP............................................................................................................................................................983
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