Administrator Guide

Recover from Stack Link Flaps..............................................................................................................................940
Recover from a Card Problem State on a Stack................................................................................................941
Chapter 55: Storm Control........................................................................................................ 943
Configure Storm Control...............................................................................................................................................943
Configuring Storm Control from INTERFACE Mode........................................................................................943
Configuring Storm Control from CONFIGURATION Mode.............................................................................944
Chapter 56: Spanning Tree Protocol (STP)............................................................................... 945
Protocol Overview..........................................................................................................................................................945
Configure Spanning Tree.............................................................................................................................................. 945
Important Points to Remember...................................................................................................................................946
Configuring Interfaces for Layer 2 Mode..................................................................................................................947
Enabling Spanning Tree Protocol Globally................................................................................................................ 948
Adding an Interface to the Spanning Tree Group...................................................................................................949
Modifying Global Parameters.......................................................................................................................................950
Modifying Interface STP Parameters......................................................................................................................... 951
Enabling PortFast............................................................................................................................................................ 951
Prevent Network Disruptions with BPDU Guard.............................................................................................. 952
Selecting STP Root........................................................................................................................................................ 954
STP Root Guard.............................................................................................................................................................. 954
Root Guard Scenario................................................................................................................................................954
Configuring Root Guard.......................................................................................................................................... 955
Enabling SNMP Traps for Root Elections and Topology Changes..................................................................... 956
Configuring Spanning Trees as Hitless......................................................................................................................956
STP Loop Guard..............................................................................................................................................................956
Configuring Loop Guard.......................................................................................................................................... 957
Displaying STP Guard Configuration..........................................................................................................................958
Chapter 57: SupportAssist........................................................................................................ 959
Configuring SupportAssist Using a Configuration Wizard.................................................................................... 959
Configuring SupportAssist Manually.......................................................................................................................... 960
Configuring SupportAssist Activity............................................................................................................................. 961
Configuring SupportAssist Company......................................................................................................................... 963
Configuring SupportAssist Person..............................................................................................................................963
Configuring SupportAssist Server.............................................................................................................................. 964
Viewing SupportAssist Configuration........................................................................................................................ 965
Chapter 58: System Time and Date............................................................................................967
Network Time Protocol................................................................................................................................................. 967
Protocol Overview.................................................................................................................................................... 968
Configure the Network Time Protocol.................................................................................................................968
Enabling NTP..............................................................................................................................................................968
Configuring NTP Broadcasts..................................................................................................................................969
Disabling NTP on an Interface............................................................................................................................... 969
Configuring a Source IP Address for NTP Packets.......................................................................................... 969
Configuring NTP Authentication........................................................................................................................... 970
Configuring NTP control key password............................................................................................................... 972
Configuring the NTP Step-Threshold.................................................................................................................. 972
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