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Stack Management Roles.......................................................................................................................................837
Stack Master Election............................................................................................................................................. 837
Virtual IP.................................................................................................................................................................... 841
Failover Roles............................................................................................................................................................ 841
MAC Addressing on Stacks.....................................................................................................................................841
Stacking LAG............................................................................................................................................................844
Supported Stacking Topologies..............................................................................................................................844
High Availability on Stacks......................................................................................................................................845
Management Access on Stacks............................................................................................................................ 846
Important Points to Remember....................................................................................................................................847
Stacking Installation Tasks............................................................................................................................................ 847
Create a Stack..........................................................................................................................................................847
Add Units to an Existing Stack.............................................................................................................................. 850
Split a Stack............................................................................................................................................................. 852
Stacking Conguration Tasks.......................................................................................................................................853
Assigning Unit Numbers to Units in an Stack...................................................................................................... 853
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 853
Displaying Information about a Stack....................................................................................................................854
Inuencing Management Unit Selection on a Stack............................................................................................857
Managing Redundancy on a Stack........................................................................................................................858
Resetting a Unit on a Stack....................................................................................................................................858
Verify a Stack Conguration........................................................................................................................................ 859
Displaying the Status of Stacking Ports............................................................................................................... 859
Removing a Unit from a Stack.....................................................................................................................................860
Troubleshoot a Stack.....................................................................................................................................................862
Recover from Stack Link Flaps.............................................................................................................................. 862
Recover from a Card Problem State on a Stack..................................................................................................862
51 Storm Control...........................................................................................................................................864
Congure Storm Control...............................................................................................................................................864
Conguring Storm Control from INTERFACE Mode...........................................................................................864
Conguring Storm Control from CONFIGURATION Mode................................................................................865
52 Spanning Tree Protocol (STP)................................................................................................................. 866
Protocol Overview.........................................................................................................................................................866
Congure Spanning Tree...............................................................................................................................................867
Related Conguration Tasks................................................................................................................................... 867
Important Points to Remember....................................................................................................................................867
Conguring Interfaces for Layer 2 Mode....................................................................................................................868
Enabling Spanning Tree Protocol Globally.................................................................................................................. 869
Adding an Interface to the Spanning Tree Group....................................................................................................... 871
Modifying Global Parameters........................................................................................................................................ 871
Modifying Interface STP Parameters.......................................................................................................................... 872
Enabling PortFast...........................................................................................................................................................872
Prevent Network Disruptions with BPDU Guard................................................................................................. 873
Selecting STP Root........................................................................................................................................................874
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