Users Guide

Important Points to Remember....................................................................................................................................961
Configuring Interfaces for Layer 2 Mode...................................................................................................................962
Enabling Spanning Tree Protocol Globally..................................................................................................................963
Adding an Interface to the Spanning Tree Group..................................................................................................... 965
Modifying Global Parameters.......................................................................................................................................965
Modifying Interface STP Parameters......................................................................................................................... 966
Enabling PortFast..........................................................................................................................................................966
Preventing Network Disruptions with BPDU Guard................................................................................................. 967
Selecting STP Root.......................................................................................................................................................969
STP Root Guard............................................................................................................................................................ 969
Root Guard Scenario...............................................................................................................................................969
Configuring Root Guard..........................................................................................................................................970
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 971
STP Loop Guard............................................................................................................................................................. 971
Configuring Loop Guard..........................................................................................................................................972
Displaying STP Guard Configuration...........................................................................................................................973
55 SupportAssist.......................................................................................................................................... 974
Configuring SupportAssist Using a Configuration Wizard........................................................................................975
Configuring SupportAssist Manually........................................................................................................................... 975
Configuring SupportAssist Activity..............................................................................................................................977
Configuring SupportAssist Company..........................................................................................................................978
Configuring SupportAssist Person.............................................................................................................................. 979
Configuring SupportAssist Server...............................................................................................................................980
Viewing SupportAssist Configuration......................................................................................................................... 980
56 System Time and Date.............................................................................................................................983
Network Time Protocol................................................................................................................................................ 983
Protocol Overview...................................................................................................................................................984
Configure the Network Time Protocol................................................................................................................. 984
Enabling NTP........................................................................................................................................................... 985
Configuring NTP Broadcasts................................................................................................................................. 985
Disabling NTP on an Interface............................................................................................................................... 985
Configuring a Source IP Address for NTP Packets............................................................................................ 986
Configuring NTP Authentication........................................................................................................................... 986
Time and Date................................................................................................................................................................988
Configuration Task List ..........................................................................................................................................988
Setting the Time and Date for the Switch Software Clock...............................................................................989
Setting the Timezone..............................................................................................................................................989
Set Daylight Saving Time....................................................................................................................................... 990
Setting Daylight Saving Time Once...................................................................................................................... 990
Setting Recurring Daylight Saving Time...............................................................................................................990
Configuring a Custom-defined Period for NTP time Synchronization............................................................. 992
57 Tunneling ................................................................................................................................................993
Configuring a Tunnel..................................................................................................................................................... 993
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