Users Guide

Recover from Stack Link Flaps.................................................................................................................................830
Recover from a Card Problem State on a Stack........................................................................................................831
Recover from a Card Mismatch State on a Stack.....................................................................................................832
53 Storm Control........................................................................................................... 834
Congure Storm Control................................................................................................................................................ 834
Conguring Storm Control from INTERFACE Mode.................................................................................................834
Conguring Storm Control from CONFIGURATION Mode.......................................................................................835
54 Spanning Tree Protocol (STP)...................................................................................836
Protocol Overview......................................................................................................................................................... 836
Congure Spanning Tree................................................................................................................................................836
Related Conguration Tasks.....................................................................................................................................836
Important Points to Remember......................................................................................................................................836
Conguring Interfaces for Layer 2 Mode........................................................................................................................ 837
Enabling Spanning Tree Protocol Globally.......................................................................................................................838
Adding an Interface to the Spanning Tree Group............................................................................................................840
Modifying Global Parameters......................................................................................................................................... 840
Modifying Interface STP Parameters.............................................................................................................................. 841
Enabling PortFast........................................................................................................................................................... 841
Prevent Network Disruptions with BPDU Guard...................................................................................................... 842
Selecting STP Root........................................................................................................................................................844
STP Root Guard.............................................................................................................................................................844
Root Guard Scenario................................................................................................................................................844
Conguring Root Guard........................................................................................................................................... 845
Enabling SNMP Traps for Root Elections and Topology Changes...................................................................................846
Conguring Spanning Trees as Hitless............................................................................................................................846
STP Loop Guard.............................................................................................................................................................846
Conguring Loop Guard........................................................................................................................................... 847
Displaying STP Guard Conguration...............................................................................................................................848
55 SupportAssist........................................................................................................... 849
Conguring SupportAssist Using a Conguration Wizard...............................................................................................849
Conguring SupportAssist Manually.............................................................................................................................. 850
Conguring SupportAssist Activity................................................................................................................................. 851
Conguring SupportAssist Company............................................................................................................................. 853
Conguring SupportAssist Person................................................................................................................................. 853
Conguring SupportAssist Server..................................................................................................................................854
Viewing SupportAssist Conguration.............................................................................................................................855
56 System Time and Date.............................................................................................. 857
Network Time Protocol.................................................................................................................................................. 857
Protocol Overview................................................................................................................................................... 858
Congure the Network Time Protocol......................................................................................................................858
Enabling NTP........................................................................................................................................................... 858
Conguring NTP Broadcasts....................................................................................................................................859
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