Administrator Guide

Congure Storm Control.............................................................................................................................................. 968
Conguring Storm Control from INTERFACE Mode...........................................................................................968
Conguring Storm Control from CONFIGURATION Mode................................................................................969
54 Spanning Tree Protocol (STP)................................................................................................................. 970
Protocol Overview......................................................................................................................................................... 970
Congure Spanning Tree...............................................................................................................................................970
Related Conguration Tasks....................................................................................................................................971
Important Points to Remember.................................................................................................................................... 971
Conguring Interfaces for Layer 2 Mode....................................................................................................................972
Enabling Spanning Tree Protocol Globally...................................................................................................................973
Adding an Interface to the Spanning Tree Group...................................................................................................... 975
Modifying Global Parameters....................................................................................................................................... 975
Modifying Interface STP Parameters.......................................................................................................................... 976
Enabling PortFast...........................................................................................................................................................976
Preventing Network Disruptions with BPDU Guard..................................................................................................977
Selecting STP Root....................................................................................................................................................... 979
STP Root Guard.............................................................................................................................................................979
Root Guard Scenario............................................................................................................................................... 979
Conguring Root Guard..........................................................................................................................................980
Enabling SNMP Traps for Root Elections and Topology Changes........................................................................... 981
STP Loop Guard............................................................................................................................................................. 981
Conguring Loop Guard..........................................................................................................................................982
Displaying STP Guard Conguration........................................................................................................................... 983
55 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...............................................................................................................................990
Viewing SupportAssist Conguration......................................................................................................................... 990
56 System Time and Date.............................................................................................................................993
Network Time Protocol.................................................................................................................................................993
Protocol Overview...................................................................................................................................................994
Congure the Network Time Protocol..................................................................................................................994
Enabling NTP........................................................................................................................................................... 995
Conguring NTP Broadcasts................................................................................................................................. 995
Disabling NTP on an Interface............................................................................................................................... 995
Conguring a Source IP Address for NTP Packets.............................................................................................996
Conguring NTP Authentication........................................................................................................................... 996
Time and Date................................................................................................................................................................998
Conguration Task List .......................................................................................................................................... 998
Setting the Time and Date for the Switch Software Clock............................................................................... 999
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