Users Guide

Management Access on Stacks............................................................................................................................ 884
Mixed-mode Stacking............................................................................................................................................. 885
Important Points to Remember................................................................................................................................... 886
Stacking Installation Tasks............................................................................................................................................ 886
Create a Stack......................................................................................................................................................... 886
Add Units to an Existing Stack............................................................................................................................... 891
Split a Stack..............................................................................................................................................................893
Stacking Conguration Tasks.......................................................................................................................................893
Assigning Unit Numbers to Units in an Stack...................................................................................................... 894
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 894
Displaying Information about a Stack....................................................................................................................894
Inuencing Management Unit Selection on a Stack............................................................................................897
Managing Redundancy on a Stack........................................................................................................................ 897
Resetting a Unit on a Stack....................................................................................................................................898
Enabling Mixed-mode Stacking............................................................................................................................. 898
Verify a Stack Conguration........................................................................................................................................ 899
Displaying the Status of Stacking Ports............................................................................................................... 899
Remove Units or Front End Ports from a Stack........................................................................................................900
Removing a Unit from a Stack...............................................................................................................................900
Removing Front End Port Stacking....................................................................................................................... 901
Troubleshoot a Stack.....................................................................................................................................................902
Recover from Stack Link Flaps.............................................................................................................................. 902
Recover from a Card Problem State on a Stack..................................................................................................902
52 Storm Control..........................................................................................................................................904
Congure Storm Control.............................................................................................................................................. 904
Conguring Storm Control from INTERFACE Mode...........................................................................................904
Conguring Storm Control from CONFIGURATION Mode................................................................................905
53 Spanning Tree Protocol (STP)................................................................................................................. 906
Protocol Overview.........................................................................................................................................................906
Congure Spanning Tree...............................................................................................................................................907
Related Conguration Tasks................................................................................................................................... 907
Important Points to Remember....................................................................................................................................907
Conguring Interfaces for Layer 2 Mode................................................................................................................... 908
Enabling Spanning Tree Protocol Globally.................................................................................................................. 909
Adding an Interface to the Spanning Tree Group........................................................................................................911
Modifying Global Parameters.........................................................................................................................................911
Modifying Interface STP Parameters...........................................................................................................................912
Enabling PortFast........................................................................................................................................................... 912
Prevent Network Disruptions with BPDU Guard..................................................................................................913
Selecting STP Root........................................................................................................................................................915
STP Root Guard............................................................................................................................................................. 915
Root Guard Scenario................................................................................................................................................915
Conguring Root Guard...........................................................................................................................................916
Enabling SNMP Traps for Root Elections and Topology Changes............................................................................917
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