Owners Manual

Protocol Overview............................................................................................................................ 916
Configure Spanning Tree..................................................................................................................916
Related Configuration Tasks.......................................................................................................916
Important Points to Remember........................................................................................................917
Configuring Interfaces for Layer 2 Mode......................................................................................... 917
Enabling Spanning Tree Protocol Globally...................................................................................... 918
Adding an Interface to the Spanning Tree Group...........................................................................920
Modifying Global Parameters........................................................................................................... 921
Modifying Interface STP Parameters................................................................................................922
Enabling PortFast.............................................................................................................................. 922
Prevent Network Disruptions with BPDU Guard....................................................................... 923
Selecting STP Root........................................................................................................................... 925
STP Root Guard................................................................................................................................ 926
Root Guard Scenario.................................................................................................................. 926
Configuring Root Guard............................................................................................................. 927
Enabling SNMP Traps for Root Elections and Topology Changes.................................................928
Configuring Spanning Trees as Hitless............................................................................................ 928
STP Loop Guard................................................................................................................................929
Configuring Loop Guard............................................................................................................ 930
Displaying STP Guard Configuration................................................................................................931
54 System Time and Date...................................................................................932
Network Time Protocol....................................................................................................................932
Protocol Overview...................................................................................................................... 933
Configure the Network Time Protocol......................................................................................934
Enabling NTP...............................................................................................................................934
Configuring NTP Broadcasts......................................................................................................934
Disabling NTP on an Interface....................................................................................................935
Configuring a Source IP Address for NTP Packets.................................................................... 935
Configuring NTP Authentication................................................................................................936
Dell Networking OS Time and Date.................................................................................................939
Configuration Task List ..............................................................................................................939
Setting the Time and Date for the Switch Software Clock....................................................... 939
Setting the Timezone..................................................................................................................939
Set Daylight Saving Time............................................................................................................940
Setting Daylight Saving Time Once........................................................................................... 940
Setting Recurring Daylight Saving Time.....................................................................................941
55 Tunneling ........................................................................................................943
Configuring a Tunnel........................................................................................................................943
Configuring Tunnel Keepalive Settings............................................................................................944
Configuring a Tunnel Interface........................................................................................................945