Concept Guide

Conguring Priority and stack-group.................................................................................................................... 824
Cabling the Switch Stack....................................................................................................................................... 825
Accessing the CLI....................................................................................................................................................825
Conguring and Bringing Up a Stack.................................................................................................................... 825
Adding a Stack Unit.................................................................................................................................................826
Resetting a Unit on a Stack....................................................................................................................................827
Removing an Aggregator from a Stack................................................................................................................. 827
Merging Two Operational Stacks........................................................................................................................... 827
Verifying a Stack Conguration................................................................................................................................... 828
Using Show Commands..........................................................................................................................................828
Troubleshooting a Switch Stack...................................................................................................................................828
Failure Scenarios......................................................................................................................................................829
Upgrading a Switch Stack.............................................................................................................................................831
Upgrading a Single Stack Unit..................................................................................................................................... 832
Stack Link Failure Detection.........................................................................................................................................832
Conguring Port Shutdown when Both Stack Links are Down.........................................................................834
54 Storm Control..........................................................................................................................................835
Congure Storm Control...............................................................................................................................................835
Conguring Storm Control from INTERFACE Mode...........................................................................................835
Conguring Storm Control from CONFIGURATION Mode................................................................................836
55 Broadcast Storm Control......................................................................................................................... 837
Supported Modes.......................................................................................................................................................... 837
Disabling Broadcast Storm Control..............................................................................................................................837
Displaying Broadcast-Storm Control Status............................................................................................................... 837
Conguring Storm Control............................................................................................................................................837
56 Spanning Tree Protocol (STP)................................................................................................................. 838
Protocol Overview......................................................................................................................................................... 838
Congure Spanning Tree...............................................................................................................................................838
Related Conguration Tasks...................................................................................................................................839
Important Points to Remember............................................................................................................................. 839
Conguring Interfaces for Layer 2 Mode....................................................................................................................840
Enabling Spanning Tree Protocol Globally................................................................................................................... 841
Adding an Interface to the Spanning Tree Group...................................................................................................... 843
Removing an Interface from the Spanning Tree Group............................................................................................ 843
Modifying Global Parameters....................................................................................................................................... 843
Modifying Interface STP Parameters..........................................................................................................................844
Enabling Port Fast......................................................................................................................................................... 844
Prevent Network Disruptions with BPDU Guard.................................................................................................845
Global BPDU Filtering....................................................................................................................................................847
Interface BPDU Filtering......................................................................................................................................... 847
Selecting STP Root....................................................................................................................................................... 848
STP Root Guard.............................................................................................................................................................849
Root Guard Scenario...............................................................................................................................................849
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