Users Guide

Assigning Unit Numbers to Units in an Stack.......................................................................................................875
Creating a Virtual Stack Unit on a Stack...............................................................................................................875
Displaying Information about a Stack.................................................................................................................... 875
Inuencing Management Unit Selection on a Stack............................................................................................877
Managing Redundancy on a Stack........................................................................................................................ 878
Resetting a Unit on a Stack....................................................................................................................................878
Verify a Stack Conguration.........................................................................................................................................879
Displaying the Status of Stacking Ports................................................................................................................879
Remove Units or Front End Ports from a Stack........................................................................................................880
Removing a Unit from a Stack...............................................................................................................................880
Removing Front End Port Stacking........................................................................................................................881
Troubleshoot a Stack......................................................................................................................................................881
Recover from Stack Link Flaps...............................................................................................................................881
Recover from a Card Problem State on a Stack..................................................................................................882
49 Storm Control..........................................................................................................................................884
Congure Storm Control...............................................................................................................................................884
Conguring Storm Control from INTERFACE Mode...........................................................................................884
Conguring Storm Control from CONFIGURATION Mode................................................................................885
PFC Storm......................................................................................................................................................................885
Detect PFC Storm...................................................................................................................................................886
Restore Queue Drop State..................................................................................................................................... 886
View Details of Storm Control PFC.......................................................................................................................886
50 Spanning Tree Protocol (STP)................................................................................................................. 888
Protocol Overview.........................................................................................................................................................888
Congure Spanning Tree.............................................................................................................................................. 889
Related Conguration Tasks...................................................................................................................................889
Important Points to Remember................................................................................................................................... 889
Conguring Interfaces for Layer 2 Mode................................................................................................................... 890
Enabling Spanning Tree Protocol Globally................................................................................................................... 891
Adding an Interface to the Spanning Tree Group...................................................................................................... 893
Modifying Global Parameters....................................................................................................................................... 893
Modifying Interface STP Parameters..........................................................................................................................894
Enabling PortFast.......................................................................................................................................................... 894
Prevent Network Disruptions with BPDU Guard.................................................................................................895
Selecting STP Root....................................................................................................................................................... 897
STP Root Guard.............................................................................................................................................................897
Root Guard Scenario............................................................................................................................................... 897
Conguring Root Guard..........................................................................................................................................898
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................899
Conguring Spanning Trees as Hitless........................................................................................................................899
STP Loop Guard............................................................................................................................................................ 899
Conguring Loop Guard.......................................................................................................................................... 901
Displaying STP Guard Conguration............................................................................................................................901
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