Reference Guide

Important Points to Remember—S4820T Stacking........................................................................898
S-Series Stacking Installation Tasks................................................................................................. 899
Create an S-Series Stack............................................................................................................ 899
Add Units to an Existing S-Series Stack..................................................................................... 904
Split an S-Series Stack.................................................................................................................907
S-Series Stacking Configuration Tasks............................................................................................ 907
Assigning Unit Numbers to Units in an S-Series Stack..............................................................907
Creating a Virtual Stack Unit on an S-Series Stack....................................................................908
Displaying Information about an S-Series Stack....................................................................... 908
Influencing Management Unit Selection on an S-Series Stack.................................................910
Managing Redundancy on an S-Series Stack............................................................................ 910
Resetting a Unit on an S-Series Stack.........................................................................................911
Verify a Stack Configuration..............................................................................................................911
Displaying the Status of Stacking Ports.......................................................................................911
Remove Units or Front End Ports from a Stack............................................................................... 913
Removing a Unit from an S-Series Stack....................................................................................913
Removing Front End Port Stacking............................................................................................ 914
Troubleshoot an S-Series Stack....................................................................................................... 914
Recover from Stack Link Flaps....................................................................................................915
Recover from a Card Problem State on an S-Series Stack........................................................915
Recover from a Card Mismatch State on an S-Series Stack......................................................916
52 Storm Control..................................................................................................... 918
Configure Storm Control..................................................................................................................918
Configuring Storm Control from INTERFACE Mode................................................................. 918
Configuring Storm Control from CONFIGURATION Mode...................................................... 918
53 Spanning Tree Protocol (STP)......................................................................... 919
Protocol Overview............................................................................................................................ 919
Configure Spanning Tree..................................................................................................................919
Related Configuration Tasks.......................................................................................................919
Important Points to Remember.......................................................................................................920
Configuring Interfaces for Layer 2 Mode........................................................................................ 920
Enabling Spanning Tree Protocol Globally...................................................................................... 921
Adding an Interface to the Spanning Tree Group........................................................................... 923
Modifying Global Parameters...........................................................................................................924
Modifying Interface STP Parameters................................................................................................925
Enabling PortFast.............................................................................................................................. 925
Prevent Network Disruptions with BPDU Guard....................................................................... 926
Selecting STP Root........................................................................................................................... 928
STP Root Guard................................................................................................................................ 929
Root Guard Scenario.................................................................................................................. 929