Reference Guide

Remove Units or Front End Ports from a Stack.....................................................................................................783
Removing a Unit from an S-Series Stack....................................................................................................... 783
Removing Front End Port Stacking.................................................................................................................784
Troubleshoot an S-Series Stack...........................................................................................................................784
Recover from Stack Link Flaps.......................................................................................................................784
Recover from a Card Problem State on an S-Series Stack............................................................................785
Recover from a Card Mismatch State on an S-Series Stack.........................................................................785
49 Storm Control......................................................................................................................... 789
Configure Storm Control....................................................................................................................................... 789
Configuring Storm Control from INTERFACE Mode........................................................................................789
Configuring Storm Control from CONFIGURATION Mode..............................................................................789
50 Spanning Tree Protocol (STP).............................................................................................791
Protocol Overview................................................................................................................................................ 791
Configure Spanning Tree......................................................................................................................................791
Related Configuration Tasks.......................................................................................................................... 791
Important Points to Remember.............................................................................................................................792
Configuring Interfaces for Layer 2 Mode..............................................................................................................792
Enabling Spanning Tree Protocol Globally........................................................................................................... 793
Adding an Interface to the Spanning Tree Group.................................................................................................795
Modifying Global Parameters...............................................................................................................................796
Modifying Interface STP Parameters...................................................................................................................797
Enabling PortFast..................................................................................................................................................797
Prevent Network Disruptions with BPDU Guard............................................................................................798
Selecting STP Root............................................................................................................................................... 800
STP Root Guard.....................................................................................................................................................800
Root Guard Scenario......................................................................................................................................800
Configuring Root Guard..................................................................................................................................801
Enabling SNMP Traps for Root Elections and Topology Changes....................................................................... 802
Configuring Spanning Trees as Hitless.................................................................................................................802
STP Loop Guard.................................................................................................................................................... 803
Configuring Loop Guard................................................................................................................................. 804
Displaying STP Guard Configuration.................................................................................................................... 805
51 System Time and Date..........................................................................................................807
Network Time Protocol.........................................................................................................................................807
Protocol Overview..........................................................................................................................................808
Configure the Network Time Protocol............................................................................................................808
Enabling NTP..................................................................................................................................................809
Setting the Hardware Clock with the Time Derived from NTP.......................................................................809
Configuring NTP Broadcasts..........................................................................................................................809