Owners Manual

Resetting a Unit on an S-Series Stack........................................................................................929
Verify a Stack Configuration.............................................................................................................929
Displaying the Status of Stacking Ports..................................................................................... 930
Remove Units or Front End Ports from a Stack............................................................................... 931
Removing a Unit from an S-Series Stack....................................................................................931
Removing Front End Port Stacking............................................................................................ 932
Troubleshoot an S-Series Stack....................................................................................................... 932
Recover from Stack Link Flaps................................................................................................... 932
Recover from a Card Problem State on an S-Series Stack....................................................... 933
Recover from a Card Mismatch State on an S-Series Stack..................................................... 934
53 Storm Control.................................................................................................936
Configure Storm Control................................................................................................................. 936
Configuring Storm Control from INTERFACE Mode.................................................................936
Configuring Storm Control from CONFIGURATION Mode......................................................936
54 Spanning Tree Protocol (STP)......................................................................937
Protocol Overview............................................................................................................................ 937
Configure Spanning Tree..................................................................................................................937
Related Configuration Tasks.......................................................................................................937
Important Points to Remember....................................................................................................... 938
Configuring Interfaces for Layer 2 Mode.........................................................................................938
Enabling Spanning Tree Protocol Globally......................................................................................939
Adding an Interface to the Spanning Tree Group........................................................................... 941
Modifying Global Parameters...........................................................................................................942
Modifying Interface STP Parameters................................................................................................943
Enabling PortFast..............................................................................................................................943
Prevent Network Disruptions with BPDU Guard.......................................................................944
Selecting STP Root........................................................................................................................... 946
STP Root Guard.................................................................................................................................947
Root Guard Scenario...................................................................................................................947
Configuring Root Guard.............................................................................................................948
Enabling SNMP Traps for Root Elections and Topology Changes.................................................949
Configuring Spanning Trees as Hitless............................................................................................949
STP Loop Guard................................................................................................................................950
Configuring Loop Guard.............................................................................................................951
Displaying STP Guard Configuration............................................................................................... 952
55 System Time and Date...................................................................................953
Network Time Protocol....................................................................................................................953
Protocol Overview......................................................................................................................954
Configure the Network Time Protocol...................................................................................... 955