Administrator Guide

53 Stacking................................................................................................................................ 854
Stacking Overview............................................................................................................................................................854
Stack Management Roles.......................................................................................................................................... 854
Stack Master Election................................................................................................................................................ 855
Virtual IP....................................................................................................................................................................... 856
Failover Roles...............................................................................................................................................................857
MAC Addressing on Stacks........................................................................................................................................857
Stacking LAG............................................................................................................................................................... 858
Supported Stacking Topologies.................................................................................................................................858
High Availability on Stacks......................................................................................................................................... 858
Management Access on Stacks................................................................................................................................859
Mixed-mode Stacking.................................................................................................................................................860
Important Points to Remember....................................................................................................................................... 861
Stacking Installation Tasks................................................................................................................................................861
Create a Stack..............................................................................................................................................................861
Add Units to an Existing Stack.................................................................................................................................. 865
Split a Stack................................................................................................................................................................. 867
Stacking Configuration Tasks.......................................................................................................................................... 867
Assigning Unit Numbers to Units in an Stack.......................................................................................................... 867
Creating a Virtual Stack Unit on a Stack..................................................................................................................868
Displaying Information about a Stack....................................................................................................................... 868
Influencing Management Unit Selection on a Stack............................................................................................... 870
Managing Redundancy on a Stack.............................................................................................................................871
Resetting a Unit on a Stack........................................................................................................................................ 871
Enabling Mixed-mode Stacking.................................................................................................................................. 871
Verify a Stack Configuration............................................................................................................................................872
Displaying the Status of Stacking Ports................................................................................................................... 872
Remove Units or Front End Ports from a Stack........................................................................................................... 873
Removing a Unit from a Stack...................................................................................................................................873
Removing Front End Port Stacking.......................................................................................................................... 874
Troubleshoot a Stack........................................................................................................................................................874
Recover from Stack Link Flaps..................................................................................................................................875
Recover from a Card Problem State on a Stack.....................................................................................................875
54 Storm Control.........................................................................................................................877
Configure Storm Control.................................................................................................................................................. 877
Configuring Storm Control from INTERFACE Mode.............................................................................................. 877
Configuring Storm Control from CONFIGURATION Mode................................................................................... 878
55 Spanning Tree Protocol (STP)................................................................................................. 879
Protocol Overview............................................................................................................................................................ 879
Configure Spanning Tree..................................................................................................................................................879
Important Points to Remember.......................................................................................................................................880
Configuring Interfaces for Layer 2 Mode.......................................................................................................................880
Enabling Spanning Tree Protocol Globally...................................................................................................................... 881
Adding an Interface to the Spanning Tree Group.........................................................................................................883
Modifying Global Parameters.......................................................................................................................................... 883
Modifying Interface STP Parameters.............................................................................................................................884
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