Concept Guide

Conguring Storm Control from CONFIGURATION Mode................................................................................956
PFC Storm......................................................................................................................................................................956
Detect PFC Storm................................................................................................................................................... 957
Restore Queue Drop State......................................................................................................................................957
View Details of Storm Control PFC....................................................................................................................... 957
52 Spanning Tree Protocol (STP)................................................................................................................. 959
Protocol Overview.........................................................................................................................................................959
Congure Spanning Tree.............................................................................................................................................. 960
Related Conguration Tasks...................................................................................................................................960
Important Points to Remember................................................................................................................................... 960
Conguring Interfaces for Layer 2 Mode.................................................................................................................... 961
Enabling Spanning Tree Protocol Globally...................................................................................................................962
Adding an Interface to the Spanning Tree Group...................................................................................................... 964
Modifying Global Parameters.......................................................................................................................................964
Modifying Interface STP Parameters..........................................................................................................................965
Enabling PortFast.......................................................................................................................................................... 966
Prevent Network Disruptions with BPDU Guard.................................................................................................966
Selecting STP Root....................................................................................................................................................... 968
STP Root Guard.............................................................................................................................................................968
Root Guard Scenario...............................................................................................................................................969
Conguring Root Guard..........................................................................................................................................969
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................970
Conguring Spanning Trees as Hitless........................................................................................................................ 970
STP Loop Guard..............................................................................................................................................................971
Conguring Loop Guard.......................................................................................................................................... 972
Displaying STP Guard Conguration............................................................................................................................973
53 SupportAssist.......................................................................................................................................... 974
Conguring SupportAssist Using a Conguration Wizard........................................................................................ 975
Conguring SupportAssist Manually........................................................................................................................... 975
Conguring SupportAssist Activity..............................................................................................................................977
Conguring SupportAssist Company.......................................................................................................................... 978
Conguring SupportAssist Person...............................................................................................................................979
Conguring SupportAssist Server............................................................................................................................... 979
Viewing SupportAssist Conguration......................................................................................................................... 980
54 System Time and Date.............................................................................................................................982
Network Time Protocol.................................................................................................................................................982
Protocol Overview...................................................................................................................................................983
Congure the Network Time Protocol..................................................................................................................983
Enabling NTP............................................................................................................................................................984
Conguring NTP Broadcasts................................................................................................................................. 984
Disabling NTP on an Interface............................................................................................................................... 985
Conguring a Source IP Address for NTP Packets.............................................................................................985
Conguring NTP Authentication........................................................................................................................... 985
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