Users Guide

Displaying Information about a Stack..........................................................................................................845
Influencing Management Unit Selection on a Stack................................................................................ 847
Managing Redundancy on a Stack...............................................................................................................848
Resetting a Unit on a Stack............................................................................................................................ 848
Verify a Stack Configuration................................................................................................................................848
Displaying the Status of Stacking Ports.......................................................................................................849
Remove Units or Front End Ports from a Stack...............................................................................................850
Removing a Unit from a Stack.......................................................................................................................850
Removing Front End Port Stacking...............................................................................................................851
Troubleshoot a Stack.............................................................................................................................................851
Recover from Stack Link Flaps.......................................................................................................................851
Recover from a Card Problem State on a Stack........................................................................................852
Recover from a Card Mismatch State on a Stack......................................................................................853
52 Storm Control....................................................................................................................................................855
Configure Storm Control..................................................................................................................................... 855
Configuring Storm Control from INTERFACE Mode................................................................................ 855
Configuring Storm Control from CONFIGURATION Mode....................................................................856
53 Spanning Tree Protocol (STP).........................................................................................................................857
Protocol Overview................................................................................................................................................. 857
Configure Spanning Tree......................................................................................................................................857
Related Configuration Tasks..........................................................................................................................858
Important Points to Remember..........................................................................................................................858
Configuring Interfaces for Layer 2 Mode..........................................................................................................859
Enabling Spanning Tree Protocol Globally...................................................................................................... 860
Adding an Interface to the Spanning Tree Group...........................................................................................862
Modifying Global Parameters..............................................................................................................................862
Modifying Interface STP Parameters..................................................................................................................863
Enabling PortFast................................................................................................................................................... 864
Prevent Network Disruptions with BPDU Guard.......................................................................................865
Selecting STP Root.................................................................................................................................................867
STP Root Guard...................................................................................................................................................... 867
Root Guard Scenario....................................................................................................................................... 867
Configuring Root Guard.................................................................................................................................868
Enabling SNMP Traps for Root Elections and Topology Changes..............................................................869
Configuring Spanning Trees as Hitless..............................................................................................................869
STP Loop Guard..................................................................................................................................................... 869
Configuring Loop Guard.................................................................................................................................870
Displaying STP Guard Configuration..................................................................................................................871
54 SupportAssist.....................................................................................................................................................872
Configuring SupportAssist Using a Configuration Wizard.............................................................................873
Configuring SupportAssist Manually.................................................................................................................. 873
Configuring SupportAssist Activity..................................................................................................................... 875
Configuring SupportAssist Company.................................................................................................................876
Configuring SupportAssist Person......................................................................................................................876
Contents
27