Administrator Guide

High Availability on Stacks...................................................................................................................................... 887
Management Access on Stacks............................................................................................................................ 888
Mixed-mode Stacking............................................................................................................................................. 889
Important Points to Remember................................................................................................................................... 890
Stacking Installation Tasks............................................................................................................................................890
Create a Stack......................................................................................................................................................... 890
Add Units to an Existing Stack.............................................................................................................................. 895
Split a Stack..............................................................................................................................................................897
Stacking Conguration Tasks....................................................................................................................................... 897
Assigning Unit Numbers to Units in an Stack...................................................................................................... 898
Creating a Virtual Stack Unit on a Stack.............................................................................................................. 898
Displaying Information about a Stack....................................................................................................................898
Inuencing Management Unit Selection on a Stack............................................................................................901
Managing Redundancy on a Stack.........................................................................................................................901
Resetting a Unit on a Stack....................................................................................................................................902
Enabling Mixed-mode Stacking............................................................................................................................. 902
Verify a Stack Conguration........................................................................................................................................ 903
Displaying the Status of Stacking Ports............................................................................................................... 903
Remove Units or Front End Ports from a Stack........................................................................................................904
Removing a Unit from a Stack...............................................................................................................................904
Removing Front End Port Stacking.......................................................................................................................905
Troubleshoot a Stack.....................................................................................................................................................906
Recover from Stack Link Flaps..............................................................................................................................906
Recover from a Card Problem State on a Stack................................................................................................. 906
52 Storm Control..........................................................................................................................................908
Congure Storm Control.............................................................................................................................................. 908
Conguring Storm Control from INTERFACE Mode...........................................................................................908
Conguring Storm Control from CONFIGURATION Mode................................................................................909
53 Spanning Tree Protocol (STP)..................................................................................................................910
Protocol Overview..........................................................................................................................................................910
Congure Spanning Tree................................................................................................................................................911
Related Conguration Tasks.................................................................................................................................... 911
Important Points to Remember.....................................................................................................................................911
Conguring Interfaces for Layer 2 Mode.................................................................................................................... 912
Enabling Spanning Tree Protocol Globally................................................................................................................... 913
Adding an Interface to the Spanning Tree Group.......................................................................................................915
Modifying Global Parameters........................................................................................................................................915
Modifying Interface STP Parameters...........................................................................................................................916
Enabling PortFast........................................................................................................................................................... 916
Prevent Network Disruptions with BPDU Guard..................................................................................................917
Selecting STP Root........................................................................................................................................................919
STP Root Guard............................................................................................................................................................. 919
Root Guard Scenario................................................................................................................................................919
Conguring Root Guard..........................................................................................................................................920
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