Concept Guide

MAC Addressing on Stacks....................................................................................................................................962
Stacking LAG........................................................................................................................................................... 963
Supported Stacking Topologies............................................................................................................................. 963
High Availability on Stacks......................................................................................................................................964
Management Access on Stacks............................................................................................................................ 965
Mixed-mode Stacking............................................................................................................................................. 966
Important Points to Remember....................................................................................................................................967
Stacking Installation Tasks............................................................................................................................................ 967
Create a Stack..........................................................................................................................................................967
Add Units to an Existing Stack...............................................................................................................................972
Split a Stack..............................................................................................................................................................974
Stacking Conguration Tasks....................................................................................................................................... 974
Assigning Unit Numbers to Units in an Stack.......................................................................................................975
Creating a Virtual Stack Unit on a Stack...............................................................................................................975
Displaying Information about a Stack.................................................................................................................... 975
Inuencing Management Unit Selection on a Stack............................................................................................978
Managing Redundancy on a Stack........................................................................................................................ 978
Resetting a Unit on a Stack....................................................................................................................................979
Enabling Mixed-mode Stacking..............................................................................................................................979
Verify a Stack Conguration........................................................................................................................................ 980
Displaying the Status of Stacking Ports............................................................................................................... 980
Remove Units or Front End Ports from a Stack.........................................................................................................981
Removing a Unit from a Stack................................................................................................................................981
Removing Front End Port Stacking.......................................................................................................................982
Troubleshoot a Stack.....................................................................................................................................................983
Recover from Stack Link Flaps.............................................................................................................................. 983
Recover from a Card Problem State on a Stack..................................................................................................983
54 Storm Control..........................................................................................................................................985
Congure Storm Control.............................................................................................................................................. 985
Conguring Storm Control from INTERFACE Mode...........................................................................................985
Conguring Storm Control from CONFIGURATION Mode................................................................................986
55 Spanning Tree Protocol (STP)................................................................................................................. 987
Protocol Overview......................................................................................................................................................... 987
Congure Spanning Tree.............................................................................................................................................. 988
Related Conguration Tasks...................................................................................................................................988
Important Points to Remember................................................................................................................................... 988
Conguring Interfaces for Layer 2 Mode....................................................................................................................989
Enabling Spanning Tree Protocol Globally.................................................................................................................. 990
Adding an Interface to the Spanning Tree Group...................................................................................................... 992
Modifying Global Parameters....................................................................................................................................... 992
Modifying Interface STP Parameters..........................................................................................................................993
Enabling PortFast.......................................................................................................................................................... 993
Prevent Network Disruptions with BPDU Guard.................................................................................................994
Selecting STP Root....................................................................................................................................................... 996
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