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Stack Member FailsUnplugged Stacking CableMaster Switch FailsStack-Link Flapping
ErrorMaster Switch Recovers from FailureStack Unit in Card-Problem State Due to
Incorrect Dell Networking OS VersionStack Unit in Card-Problem State Due to
Configuration Mismatch.............................................................................................................902
Upgrading a Switch Stack.................................................................................................................905
Upgrading a Single Stack Unit..........................................................................................................906
51 Storm Control.................................................................................................908
Configure Storm Control................................................................................................................. 908
Configuring Storm Control from INTERFACE Mode.................................................................908
Configuring Storm Control from CONFIGURATION Mode......................................................908
52 Spanning Tree Protocol (STP)..................................................................... 909
Protocol Overview............................................................................................................................909
Configure Spanning Tree.................................................................................................................909
Related Configuration Tasks...................................................................................................... 909
Important Points to Remember..................................................................................................910
Configuring Interfaces for Layer 2 Mode......................................................................................... 911
Enabling Spanning Tree Protocol Globally...................................................................................... 912
Adding an Interface to the Spanning Tree Group............................................................................915
Removing an Interface from the Spanning Tree Group..................................................................915
Modifying Global Parameters........................................................................................................... 915
Modifying Interface STP Parameters................................................................................................916
Enabling PortFast...............................................................................................................................917
Prevent Network Disruptions with BPDU Guard........................................................................918
Global BPDU Filtering.......................................................................................................................920
Interface BPDU Filtering............................................................................................................. 920
Selecting STP Root............................................................................................................................921
STP Root Guard................................................................................................................................ 922
Root Guard Scenario.................................................................................................................. 922
Configuring Root Guard............................................................................................................. 923
SNMP Traps for Root Elections and Topology Changes................................................................ 924
Displaying STP Guard Configuration............................................................................................... 924
53 System Time and Date...................................................................................925
Network Time Protocol....................................................................................................................925
Protocol Overview......................................................................................................................926
Configure the Network Time Protocol...................................................................................... 927
Enabling NTP...............................................................................................................................927
Configuring NTP Broadcasts......................................................................................................928
Disabling NTP on an Interface....................................................................................................928
Configuring a Source IP Address for NTP Packets....................................................................928
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