Administrator Guide

Stack Master Election..............................................................................................................................................835
Virtual IP......................................................................................................................................................................838
Failover Roles.............................................................................................................................................................839
MAC Addressing on Stacks.................................................................................................................................... 839
Stacking LAG.............................................................................................................................................................. 841
Supported Stacking Topologies.............................................................................................................................842
High Availability on Stacks......................................................................................................................................842
Management Access on Stacks.............................................................................................................................843
Important Points to Remember................................................................................................................................... 844
Stacking Installation Tasks............................................................................................................................................844
Create a Stack........................................................................................................................................................... 844
Add Units to an Existing Stack.............................................................................................................................. 847
Split a Stack............................................................................................................................................................... 849
Stacking Configuration Tasks...................................................................................................................................... 849
Assigning Unit Numbers to Units in an Stack.................................................................................................... 850
Creating a Virtual Stack Unit on a Stack............................................................................................................ 850
Displaying Information about a Stack...................................................................................................................850
Influencing Management Unit Selection on a Stack.........................................................................................854
Managing Redundancy on a Stack........................................................................................................................854
Resetting a Unit on a Stack....................................................................................................................................854
Verify a Stack Configuration........................................................................................................................................855
Displaying the Status of Stacking Ports..............................................................................................................855
Removing a Unit from a Stack.....................................................................................................................................856
Troubleshoot a Stack.....................................................................................................................................................858
Recover from Stack Link Flaps..............................................................................................................................858
Recover from a Card Problem State on a Stack...............................................................................................858
Chapter 53: Storm Control........................................................................................................ 860
Configure Storm Control...............................................................................................................................................860
Configuring Storm Control from INTERFACE Mode........................................................................................860
Configuring Storm Control from CONFIGURATION Mode............................................................................. 861
Chapter 54: Spanning Tree Protocol (STP)............................................................................... 862
Protocol Overview..........................................................................................................................................................862
Configure Spanning Tree.............................................................................................................................................. 862
Important Points to Remember...................................................................................................................................863
Configuring Interfaces for Layer 2 Mode..................................................................................................................864
Enabling Spanning Tree Protocol Globally................................................................................................................ 865
Adding an Interface to the Spanning Tree Group...................................................................................................866
Modifying Global Parameters.......................................................................................................................................867
Modifying Interface STP Parameters........................................................................................................................ 868
Enabling PortFast........................................................................................................................................................... 868
Prevent Network Disruptions with BPDU Guard.............................................................................................. 869
Selecting STP Root........................................................................................................................................................ 870
STP Root Guard............................................................................................................................................................... 871
Root Guard Scenario................................................................................................................................................. 871
Configuring Root Guard...........................................................................................................................................872
Enabling SNMP Traps for Root Elections and Topology Changes......................................................................872
Configuring Spanning Trees as Hitless...................................................................................................................... 872
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