Administrator Guide

57 Spanning Tree Protocol (STP).................................................................................................................. 919
Protocol Overview..........................................................................................................................................................919
Congure Spanning Tree.............................................................................................................................................. 920
Related Conguration Tasks...................................................................................................................................920
Important Points to Remember............................................................................................................................. 920
Conguring Interfaces for Layer 2 Mode.................................................................................................................... 921
Enabling Spanning Tree Protocol Globally...................................................................................................................922
Adding an Interface to the Spanning Tree Group...................................................................................................... 924
Removing an Interface from the Spanning Tree Group............................................................................................ 924
Modifying Global Parameters....................................................................................................................................... 924
Modifying Interface STP Parameters..........................................................................................................................925
Enabling PortFast.......................................................................................................................................................... 925
Prevent Network Disruptions with BPDU Guard.......................................................................................................926
Global BPDU Filtering....................................................................................................................................................928
Interface BPDU Filtering...............................................................................................................................................928
Selecting STP Root....................................................................................................................................................... 929
STP Root Guard.............................................................................................................................................................929
Root Guard Scenario...............................................................................................................................................930
Conguring Root Guard...........................................................................................................................................931
Enabling SNMP Traps for Root Elections and Topology Changes........................................................................... 931
Conguring Spanning Trees as Hitless.........................................................................................................................931
STP Loop Guard.............................................................................................................................................................932
Conguring Loop Guard..........................................................................................................................................933
Displaying STP Guard Conguration........................................................................................................................... 934
58 SupportAssist..........................................................................................................................................935
Conguring SupportAssist Using a Conguration Wizard........................................................................................936
Conguring SupportAssist Manually........................................................................................................................... 936
Conguring SupportAssist Activity............................................................................................................................. 938
Conguring SupportAssist Company..........................................................................................................................939
Conguring SupportAssist Person.............................................................................................................................. 940
Conguring SupportAssist Server...............................................................................................................................940
Viewing SupportAssist Conguration.......................................................................................................................... 941
59 System Time and Date.............................................................................................................................943
Network Time Protocol.................................................................................................................................................943
Protocol Overview................................................................................................................................................... 944
Congure the Network Time Protocol..................................................................................................................944
Enabling NTP........................................................................................................................................................... 945
Conguring NTP Broadcasts................................................................................................................................. 945
Disabling NTP on an Interface................................................................................................................................946
Conguring a Source IP Address for NTP Packets.............................................................................................946
Conguring NTP Authentication........................................................................................................................... 946
Conguring a Custom-dened Period for NTP time Synchronization..............................................................949
Dell Networking OS Time and Date.............................................................................................................................949
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