Service Manual

48 Spanning Tree Protocol (STP)................................................................................... 749
Protocol Overview..........................................................................................................................................................749
Congure Spanning Tree................................................................................................................................................ 749
Related Conguration Tasks..................................................................................................................................... 749
Important Points to Remember...................................................................................................................................... 749
Conguring Interfaces for Layer 2 Mode........................................................................................................................750
Enabling Spanning Tree Protocol Globally........................................................................................................................751
Adding an Interface to the Spanning Tree Group............................................................................................................753
Modifying Global Parameters..........................................................................................................................................753
Modifying Interface STP Parameters..............................................................................................................................754
Enabling PortFast...........................................................................................................................................................754
Prevent Network Disruptions with BPDU Guard...................................................................................................... 755
Selecting STP Root........................................................................................................................................................ 757
STP Root Guard............................................................................................................................................................. 757
Root Guard Scenario................................................................................................................................................ 757
Conguring Root Guard........................................................................................................................................... 758
Enabling SNMP Traps for Root Elections and Topology Changes...................................................................................759
Conguring Spanning Trees as Hitless............................................................................................................................759
STP Loop Guard.............................................................................................................................................................759
Conguring Loop Guard........................................................................................................................................... 760
Displaying STP Guard Conguration................................................................................................................................761
49 System Time and Date.............................................................................................. 762
Network Time Protocol.................................................................................................................................................. 762
Protocol Overview....................................................................................................................................................763
Congure the Network Time Protocol......................................................................................................................763
Enabling NTP........................................................................................................................................................... 763
Conguring NTP Broadcasts....................................................................................................................................764
Disabling NTP on an Interface.................................................................................................................................. 764
Conguring a Source IP Address for NTP Packets................................................................................................... 764
Conguring NTP Authentication.............................................................................................................................. 765
Dell Networking OS Time and Date................................................................................................................................ 767
Conguration Task List ............................................................................................................................................ 767
Setting the Time and Date for the Switch Software Clock.......................................................................................768
Setting the Timezone............................................................................................................................................... 768
Set Daylight Saving Time..........................................................................................................................................768
Setting Daylight Saving Time Once.......................................................................................................................... 769
Setting Recurring Daylight Saving Time................................................................................................................... 769
50 Tunneling .................................................................................................................. 771
Conguring a Tunnel........................................................................................................................................................771
Conguring Tunnel Keepalive Settings............................................................................................................................772
Conguring a Tunnel Interface........................................................................................................................................772
Conguring Tunnel allow-remote Decapsulation............................................................................................................. 773
Conguring Tunnel source anylocal Decapsulation..........................................................................................................773
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