Concept Guide

Table Of Contents
Adding an Interface to the Spanning Tree Group...................................................................................................946
Modifying Global Parameters....................................................................................................................................... 947
Modifying Interface STP Parameters.........................................................................................................................947
Enabling PortFast........................................................................................................................................................... 948
Prevent Network Disruptions with BPDU Guard.................................................................................................... 948
Selecting STP Root........................................................................................................................................................ 950
STP Root Guard..............................................................................................................................................................950
Root Guard Scenario................................................................................................................................................950
Configuring Root Guard........................................................................................................................................... 951
Enabling SNMP Traps for Root Elections and Topology Changes..................................................................... 952
STP Loop Guard..............................................................................................................................................................952
Configuring Loop Guard.......................................................................................................................................... 953
Displaying STP Guard Configuration..........................................................................................................................954
Chapter 56: SupportAssist........................................................................................................ 955
Configuring SupportAssist Using a Configuration Wizard.................................................................................... 956
Configuring SupportAssist Manually.......................................................................................................................... 956
Configuring SupportAssist Activity............................................................................................................................ 958
Configuring SupportAssist Company......................................................................................................................... 959
Configuring SupportAssist Person............................................................................................................................. 960
Configuring SupportAssist Server.............................................................................................................................. 960
Viewing SupportAssist Configuration......................................................................................................................... 961
Chapter 57: System Time and Date............................................................................................963
Network Time Protocol................................................................................................................................................. 963
Protocol Overview.................................................................................................................................................... 964
Configure the Network Time Protocol.................................................................................................................964
Enabling NTP..............................................................................................................................................................964
Configuring NTP Broadcasts................................................................................................................................. 965
Disabling NTP on an Interface............................................................................................................................... 965
Configuring a Source IP Address for NTP Packets..........................................................................................965
Configuring NTP Authentication........................................................................................................................... 966
Configuring NTP control key password...............................................................................................................968
Configuring the NTP Step-Threshold.................................................................................................................. 968
Time and Date..................................................................................................................................................................968
Configuration Task List .......................................................................................................................................... 968
Setting the Time and Date for the Switch Software Clock........................................................................... 969
Setting the Timezone...............................................................................................................................................969
Set Daylight Saving Time........................................................................................................................................ 969
Setting Daylight Saving Time Once......................................................................................................................969
Setting Recurring Daylight Saving Time..............................................................................................................970
Configuring a Custom-defined Period for NTP time Synchronization..........................................................971
Chapter 58: Tunneling .............................................................................................................. 972
Configuring a Tunnel...................................................................................................................................................... 972
Configuring Tunnel Keepalive Settings......................................................................................................................973
Configuring a Tunnel Interface.................................................................................................................................... 973
Configuring Tunnel allow-remote Decapsulation.....................................................................................................974
Configuring Tunnel source anylocal Decapsulation.................................................................................................974
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