Administrator Guide

Removing a Unit from a Stack......................................................................................................................................831
Troubleshoot a Stack.....................................................................................................................................................833
Recover from Stack Link Flaps.............................................................................................................................. 833
Recover from a Card Problem State on a Stack..................................................................................................833
51 Storm Control.......................................................................................................................................... 835
Congure Storm Control...............................................................................................................................................835
Conguring Storm Control from INTERFACE Mode...........................................................................................835
Conguring Storm Control from CONFIGURATION Mode................................................................................836
52 Spanning Tree Protocol (STP)................................................................................................................. 837
Protocol Overview......................................................................................................................................................... 837
Congure Spanning Tree...............................................................................................................................................838
Related Conguration Tasks...................................................................................................................................838
Important Points to Remember................................................................................................................................... 838
Conguring Interfaces for Layer 2 Mode....................................................................................................................839
Enabling Spanning Tree Protocol Globally...................................................................................................................840
Adding an Interface to the Spanning Tree Group...................................................................................................... 842
Modifying Global Parameters....................................................................................................................................... 842
Modifying Interface STP Parameters..........................................................................................................................843
Enabling PortFast.......................................................................................................................................................... 843
Prevent Network Disruptions with BPDU Guard.................................................................................................844
Selecting STP Root....................................................................................................................................................... 845
STP Root Guard.............................................................................................................................................................846
Root Guard Scenario............................................................................................................................................... 846
Conguring Root Guard.......................................................................................................................................... 847
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................848
Conguring Spanning Trees as Hitless........................................................................................................................848
STP Loop Guard.............................................................................................................................................................848
Conguring Loop Guard..........................................................................................................................................849
Displaying STP Guard Conguration........................................................................................................................... 850
53 SupportAssist...........................................................................................................................................851
Conguring SupportAssist Using a Conguration Wizard........................................................................................852
Conguring SupportAssist Manually........................................................................................................................... 852
Conguring SupportAssist Activity............................................................................................................................. 854
Conguring SupportAssist Company..........................................................................................................................855
Conguring SupportAssist Person.............................................................................................................................. 856
Conguring SupportAssist Server...............................................................................................................................856
Viewing SupportAssist Conguration..........................................................................................................................857
54 System Time and Date.............................................................................................................................859
Network Time Protocol.................................................................................................................................................859
Protocol Overview...................................................................................................................................................860
Congure the Network Time Protocol..................................................................................................................860
Enabling NTP............................................................................................................................................................ 861
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