Administrator Guide

Stacking LAG............................................................................................................................................................877
Supported Stacking Topologies..............................................................................................................................878
High Availability on Stacks...................................................................................................................................... 878
Management Access on Stacks.............................................................................................................................878
Important Points to Remember....................................................................................................................................879
Stacking Installation Tasks............................................................................................................................................ 879
Create a Stack..........................................................................................................................................................879
Add Units to an Existing Stack...............................................................................................................................884
Split a Stack............................................................................................................................................................. 886
Stacking Conguration Tasks.......................................................................................................................................886
Assigning Unit Numbers to Units in an Stack.......................................................................................................887
Creating a Virtual Stack Unit on a Stack...............................................................................................................887
Displaying Information about a Stack.................................................................................................................... 887
Inuencing Management Unit Selection on a Stack........................................................................................... 889
Managing Redundancy on a Stack........................................................................................................................890
Resetting a Unit on a Stack....................................................................................................................................890
Verify a Stack Conguration........................................................................................................................................ 890
Displaying the Status of Stacking Ports................................................................................................................ 891
Remove Units or Front End Ports from a Stack........................................................................................................892
Removing a Unit from a Stack............................................................................................................................... 892
Removing Front End Port Stacking.......................................................................................................................893
Troubleshoot a Stack.....................................................................................................................................................893
Recover from Stack Link Flaps.............................................................................................................................. 894
Recover from a Card Problem State on a Stack..................................................................................................894
52 Storm Control..........................................................................................................................................896
Congure Storm Control.............................................................................................................................................. 896
Conguring Storm Control from INTERFACE Mode...........................................................................................896
Conguring Storm Control from CONFIGURATION Mode................................................................................ 897
53 Spanning Tree Protocol (STP)................................................................................................................. 898
Protocol Overview.........................................................................................................................................................898
Congure Spanning Tree.............................................................................................................................................. 899
Related Conguration Tasks...................................................................................................................................899
Important Points to Remember................................................................................................................................... 899
Conguring Interfaces for Layer 2 Mode................................................................................................................... 900
Enabling Spanning Tree Protocol Globally................................................................................................................... 901
Adding an Interface to the Spanning Tree Group...................................................................................................... 903
Modifying Global Parameters.......................................................................................................................................903
Modifying Interface STP Parameters..........................................................................................................................904
Enabling PortFast.......................................................................................................................................................... 904
Prevent Network Disruptions with BPDU Guard.................................................................................................905
Selecting STP Root....................................................................................................................................................... 907
STP Root Guard.............................................................................................................................................................907
Root Guard Scenario............................................................................................................................................... 907
Conguring Root Guard..........................................................................................................................................908
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