Users Guide

Stacking Installation Tasks........................................................................................................................................... 888
Create a Stack......................................................................................................................................................... 888
Add Units to an Existing Stack.............................................................................................................................. 893
Split a Stack............................................................................................................................................................. 895
Stacking Configuration Tasks...................................................................................................................................... 895
Assigning Unit Numbers to Units in an Stack...................................................................................................... 896
Creating a Virtual Stack Unit on a Stack..............................................................................................................896
Displaying Information about a Stack................................................................................................................... 896
Influencing Management Unit Selection on a Stack...........................................................................................899
Managing Redundancy on a Stack........................................................................................................................899
Resetting a Unit on a Stack................................................................................................................................... 900
Enabling Mixed-mode Stacking.............................................................................................................................900
Verify a Stack Configuration.........................................................................................................................................901
Displaying the Status of Stacking Ports................................................................................................................901
Remove Units or Front End Ports from a Stack....................................................................................................... 902
Removing a Unit from a Stack...............................................................................................................................902
Removing Front End Port Stacking...................................................................................................................... 903
Troubleshoot a Stack....................................................................................................................................................904
Recover from Stack Link Flaps..............................................................................................................................904
Recover from a Card Problem State on a Stack.................................................................................................904
52 Storm Control......................................................................................................................................... 906
Configure Storm Control..............................................................................................................................................906
Configuring Storm Control from INTERFACE Mode..........................................................................................906
Configuring Storm Control from CONFIGURATION Mode............................................................................... 907
53 Spanning Tree Protocol (STP)................................................................................................................ 908
Protocol Overview........................................................................................................................................................ 908
Configure Spanning Tree..............................................................................................................................................909
Related Configuration Tasks..................................................................................................................................909
Important Points to Remember...................................................................................................................................909
Configuring Interfaces for Layer 2 Mode....................................................................................................................910
Enabling Spanning Tree Protocol Globally................................................................................................................... 911
Adding an Interface to the Spanning Tree Group......................................................................................................913
Modifying Global Parameters........................................................................................................................................913
Modifying Interface STP Parameters.......................................................................................................................... 914
Enabling PortFast...........................................................................................................................................................914
Prevent Network Disruptions with BPDU Guard.................................................................................................915
Selecting STP Root........................................................................................................................................................917
STP Root Guard............................................................................................................................................................. 917
Root Guard Scenario................................................................................................................................................917
Configuring Root Guard.......................................................................................................................................... 918
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 919
Configuring Spanning Trees as Hitless........................................................................................................................919
STP Loop Guard.............................................................................................................................................................919
Configuring Loop Guard.......................................................................................................................................... 921
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