Administrator Guide

Recover from Stack Link Flaps..................................................................................................................................846
Recover from a Card Problem State on a Stack.....................................................................................................846
50 Storm Control........................................................................................................................ 848
Configure Storm Control..................................................................................................................................................848
Configuring Storm Control from INTERFACE Mode..............................................................................................848
Configuring Storm Control from CONFIGURATION Mode...................................................................................849
PFC Storm......................................................................................................................................................................... 849
Detect PFC Storm...................................................................................................................................................... 849
Restore Queue Drop State........................................................................................................................................ 850
View Details of Storm Control PFC.......................................................................................................................... 850
51 Spanning Tree Protocol (STP)................................................................................................. 852
Protocol Overview............................................................................................................................................................ 852
Configure Spanning Tree................................................................................................................................................. 852
Important Points to Remember.......................................................................................................................................853
Configuring Interfaces for Layer 2 Mode.......................................................................................................................853
Enabling Spanning Tree Protocol Globally..................................................................................................................... 854
Adding an Interface to the Spanning Tree Group.........................................................................................................856
Modifying Global Parameters.......................................................................................................................................... 856
Modifying Interface STP Parameters............................................................................................................................. 857
Enabling PortFast..............................................................................................................................................................857
Prevent Network Disruptions with BPDU Guard....................................................................................................858
Selecting STP Root...........................................................................................................................................................860
STP Root Guard................................................................................................................................................................860
Root Guard Scenario.................................................................................................................................................. 860
Configuring Root Guard.............................................................................................................................................. 861
Enabling SNMP Traps for Root Elections and Topology Changes............................................................................. 862
Configuring Spanning Trees as Hitless...........................................................................................................................862
STP Loop Guard................................................................................................................................................................862
Configuring Loop Guard............................................................................................................................................. 863
Displaying STP Guard Configuration...............................................................................................................................864
52 SupportAssist........................................................................................................................ 865
Configuring SupportAssist Using a Configuration Wizard........................................................................................... 865
Configuring SupportAssist Manually...............................................................................................................................866
Configuring SupportAssist Activity................................................................................................................................. 867
Configuring SupportAssist Company............................................................................................................................. 869
Configuring SupportAssist Person..................................................................................................................................869
Configuring SupportAssist Server...................................................................................................................................870
Viewing SupportAssist Configuration..............................................................................................................................871
53 System Time and Date.............................................................................................................873
Network Time Protocol.................................................................................................................................................... 873
Protocol Overview.......................................................................................................................................................874
Configure the Network Time Protocol..................................................................................................................... 874
Enabling NTP................................................................................................................................................................874
Configuring NTP Broadcasts..................................................................................................................................... 875
Disabling NTP on an Interface................................................................................................................................... 875
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