Users Guide

Creating a Virtual Stack Unit on a Stack.............................................................................................................. 872
Displaying Information about a Stack....................................................................................................................872
Influencing Management Unit Selection on a Stack........................................................................................... 875
Managing Redundancy on a Stack........................................................................................................................875
Resetting a Unit on a Stack....................................................................................................................................876
Verify a Stack Configuration........................................................................................................................................ 876
Displaying the Status of Stacking Ports............................................................................................................... 876
Remove Units or Front End Ports from a Stack........................................................................................................878
Removing a Unit from a Stack...............................................................................................................................878
Removing Front End Port Stacking.......................................................................................................................878
Troubleshoot a Stack.................................................................................................................................................... 879
Recover from Stack Link Flaps..............................................................................................................................879
Recover from a Card Problem State on a Stack.................................................................................................879
49 Storm Control.......................................................................................................................................... 881
Configure Storm Control...............................................................................................................................................881
Configuring Storm Control from INTERFACE Mode...........................................................................................881
Configuring Storm Control from CONFIGURATION Mode............................................................................... 882
PFC Storm......................................................................................................................................................................882
Detect PFC Storm...................................................................................................................................................883
Restore Queue Drop State.....................................................................................................................................883
View Details of Storm Control PFC.......................................................................................................................883
50 Spanning Tree Protocol (STP)................................................................................................................ 885
Protocol Overview.........................................................................................................................................................885
Configure Spanning Tree..............................................................................................................................................886
Related Configuration Tasks..................................................................................................................................886
Important Points to Remember...................................................................................................................................886
Configuring Interfaces for Layer 2 Mode................................................................................................................... 887
Enabling Spanning Tree Protocol Globally..................................................................................................................888
Adding an Interface to the Spanning Tree Group..................................................................................................... 890
Modifying Global Parameters.......................................................................................................................................890
Modifying Interface STP Parameters..........................................................................................................................891
Enabling PortFast...........................................................................................................................................................891
Prevent Network Disruptions with BPDU Guard................................................................................................ 892
Selecting STP Root.......................................................................................................................................................894
STP Root Guard............................................................................................................................................................ 894
Root Guard Scenario...............................................................................................................................................894
Configuring Root Guard..........................................................................................................................................895
Enabling SNMP Traps for Root Elections and Topology Changes......................................................................... 896
Configuring Spanning Trees as Hitless....................................................................................................................... 896
STP Loop Guard............................................................................................................................................................ 896
Configuring Loop Guard......................................................................................................................................... 898
Displaying STP Guard Configuration...........................................................................................................................898
51 SupportAssist.......................................................................................................................................... 900
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