Concept Guide

Congure Storm Control.............................................................................................................................................. 965
Conguring Storm Control from INTERFACE Mode...........................................................................................965
Conguring Storm Control from CONFIGURATION Mode................................................................................966
PFC Storm......................................................................................................................................................................966
Detect PFC Storm................................................................................................................................................... 967
Restore Queue Drop State......................................................................................................................................967
View Details of Storm Control PFC....................................................................................................................... 967
52 Spanning Tree Protocol (STP)................................................................................................................. 969
Protocol Overview.........................................................................................................................................................969
Congure Spanning Tree...............................................................................................................................................970
Related Conguration Tasks................................................................................................................................... 970
Important Points to Remember....................................................................................................................................970
Conguring Interfaces for Layer 2 Mode.....................................................................................................................971
Enabling Spanning Tree Protocol Globally...................................................................................................................972
Adding an Interface to the Spanning Tree Group.......................................................................................................974
Modifying Global Parameters........................................................................................................................................974
Modifying Interface STP Parameters.......................................................................................................................... 975
Enabling PortFast...........................................................................................................................................................976
Prevent Network Disruptions with BPDU Guard................................................................................................. 976
Selecting STP Root........................................................................................................................................................978
STP Root Guard.............................................................................................................................................................978
Root Guard Scenario............................................................................................................................................... 979
Conguring Root Guard.......................................................................................................................................... 979
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 980
Conguring Spanning Trees as Hitless........................................................................................................................980
STP Loop Guard............................................................................................................................................................. 981
Conguring Loop Guard..........................................................................................................................................982
Displaying STP Guard Conguration........................................................................................................................... 983
53 SupportAssist.......................................................................................................................................... 984
Conguring SupportAssist Using a Conguration Wizard........................................................................................985
Conguring SupportAssist Manually...........................................................................................................................985
Conguring SupportAssist Activity..............................................................................................................................987
Conguring SupportAssist Company..........................................................................................................................988
Conguring SupportAssist Person.............................................................................................................................. 989
Conguring SupportAssist Server...............................................................................................................................989
Viewing SupportAssist Conguration......................................................................................................................... 990
54 System Time and Date.............................................................................................................................992
Network Time Protocol.................................................................................................................................................992
Protocol Overview...................................................................................................................................................993
Congure the Network Time Protocol..................................................................................................................993
Enabling NTP........................................................................................................................................................... 994
Conguring NTP Broadcasts................................................................................................................................. 994
Disabling NTP on an Interface............................................................................................................................... 995
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