Users Guide

Recover from Stack Link Flaps.................................................................................................................................830
Recover from a Card Problem State on an S-Series Stack........................................................................................831
53 Storm Control........................................................................................................... 832
Congure Storm Control................................................................................................................................................ 832
Conguring Storm Control from INTERFACE Mode.................................................................................................832
Conguring Storm Control from CONFIGURATION Mode....................................................................................... 832
54 Spanning Tree Protocol (STP)...................................................................................833
Protocol Overview......................................................................................................................................................... 833
Congure Spanning Tree................................................................................................................................................ 833
Related Conguration Tasks..................................................................................................................................... 833
Important Points to Remember......................................................................................................................................833
Conguring Interfaces for Layer 2 Mode........................................................................................................................834
Enabling Spanning Tree Protocol Globally.......................................................................................................................835
Adding an Interface to the Spanning Tree Group............................................................................................................ 837
Modifying Global Parameters..........................................................................................................................................837
Modifying Interface STP Parameters............................................................................................................................. 838
Enabling PortFast...........................................................................................................................................................838
Prevent Network Disruptions with BPDU Guard...................................................................................................... 839
Selecting STP Root.........................................................................................................................................................841
STP Root Guard..............................................................................................................................................................841
Root Guard Scenario.................................................................................................................................................841
Conguring Root Guard........................................................................................................................................... 842
Enabling SNMP Traps for Root Elections and Topology Changes................................................................................... 843
Conguring Spanning Trees as Hitless............................................................................................................................843
STP Loop Guard.............................................................................................................................................................843
Conguring Loop Guard........................................................................................................................................... 844
Displaying STP Guard Conguration...............................................................................................................................845
55 System Time and Date.............................................................................................. 846
Network Time Protocol.................................................................................................................................................. 846
Protocol Overview....................................................................................................................................................847
Congure the Network Time Protocol......................................................................................................................847
Enabling NTP........................................................................................................................................................... 847
Conguring NTP Broadcasts....................................................................................................................................848
Disabling NTP on an Interface..................................................................................................................................848
Conguring a Source IP Address for NTP Packets...................................................................................................848
Conguring NTP Authentication.............................................................................................................................. 849
Dell Networking OS Time and Date.................................................................................................................................851
Conguration Task List .............................................................................................................................................851
Setting the Time and Date for the Switch Software Clock.......................................................................................852
Setting the Timezone...............................................................................................................................................852
Set Daylight Saving Time......................................................................................................................................... 852
Setting Daylight Saving Time Once.......................................................................................................................... 853
Setting Recurring Daylight Saving Time................................................................................................................... 853
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