Administrator Guide

Stacking Installation Tasks............................................................................................................................................ 873
Create a Stack..........................................................................................................................................................873
Add Units to an Existing Stack............................................................................................................................... 877
Split a Stack............................................................................................................................................................. 880
Stacking Conguration Tasks.......................................................................................................................................880
Assigning Unit Numbers to Units in an Stack...................................................................................................... 880
Creating a Virtual Stack Unit on a Stack............................................................................................................... 881
Displaying Information about a Stack.....................................................................................................................881
Inuencing Management Unit Selection on a Stack........................................................................................... 883
Managing Redundancy on a Stack........................................................................................................................883
Resetting a Unit on a Stack....................................................................................................................................884
Verify a Stack Conguration.........................................................................................................................................884
Displaying the Status of Stacking Ports................................................................................................................884
Remove Units or Front End Ports from a Stack........................................................................................................886
Removing a Unit from a Stack...............................................................................................................................886
Removing Front End Port Stacking....................................................................................................................... 887
Troubleshoot a Stack.....................................................................................................................................................887
Recover from Stack Link Flaps...............................................................................................................................887
Recover from a Card Problem State on a Stack..................................................................................................888
Recover from a Card Mismatch State on a Stack...............................................................................................888
52 Storm Control..........................................................................................................................................890
Congure Storm Control.............................................................................................................................................. 890
Conguring Storm Control from INTERFACE Mode...........................................................................................890
Conguring Storm Control from CONFIGURATION Mode.................................................................................891
53 Spanning Tree Protocol (STP)................................................................................................................. 892
Protocol Overview.........................................................................................................................................................892
Congure Spanning Tree...............................................................................................................................................893
Related Conguration Tasks...................................................................................................................................893
Important Points to Remember................................................................................................................................... 893
Conguring Interfaces for Layer 2 Mode....................................................................................................................894
Enabling Spanning Tree Protocol Globally.................................................................................................................. 895
Adding an Interface to the Spanning Tree Group.......................................................................................................897
Modifying Global Parameters....................................................................................................................................... 897
Modifying Interface STP Parameters..........................................................................................................................898
Enabling PortFast.......................................................................................................................................................... 898
Prevent Network Disruptions with BPDU Guard.................................................................................................899
Selecting STP Root........................................................................................................................................................901
STP Root Guard............................................................................................................................................................. 901
Root Guard Scenario................................................................................................................................................901
Conguring Root Guard..........................................................................................................................................902
Enabling SNMP Traps for Root Elections and Topology Changes...........................................................................903
Conguring Spanning Trees as Hitless........................................................................................................................903
STP Loop Guard............................................................................................................................................................ 903
Conguring Loop Guard..........................................................................................................................................905
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