Concept Guide

Stacking Conguration Tasks....................................................................................................................................... 878
Assigning Unit Numbers to Units in an Stack.......................................................................................................878
Creating a Virtual Stack Unit on a Stack...............................................................................................................878
Displaying Information about a Stack.................................................................................................................... 879
Inuencing Management Unit Selection on a Stack........................................................................................... 880
Managing Redundancy on a Stack.........................................................................................................................881
Resetting a Unit on a Stack.................................................................................................................................... 881
Verify a Stack Conguration.........................................................................................................................................882
Displaying the Status of Stacking Ports................................................................................................................882
Remove Units or Front End Ports from a Stack........................................................................................................883
Removing a Unit from a Stack............................................................................................................................... 883
Removing Front End Port Stacking.......................................................................................................................884
Troubleshoot a Stack.....................................................................................................................................................884
Recover from Stack Link Flaps..............................................................................................................................885
Recover from a Card Problem State on a Stack..................................................................................................885
50 Storm Control.......................................................................................................................................... 887
Congure Storm Control...............................................................................................................................................887
Conguring Storm Control from INTERFACE Mode........................................................................................... 887
Conguring Storm Control from CONFIGURATION Mode................................................................................888
51 Spanning Tree Protocol (STP)..................................................................................................................889
Protocol Overview.........................................................................................................................................................889
Congure Spanning Tree.............................................................................................................................................. 890
Related Conguration Tasks...................................................................................................................................890
Important Points to Remember................................................................................................................................... 890
Conguring Interfaces for Layer 2 Mode.................................................................................................................... 891
Enabling Spanning Tree Protocol Globally...................................................................................................................892
Adding an Interface to the Spanning Tree Group...................................................................................................... 894
Modifying Global Parameters....................................................................................................................................... 894
Modifying Interface STP Parameters..........................................................................................................................895
Enabling PortFast.......................................................................................................................................................... 895
Prevent Network Disruptions with BPDU Guard.................................................................................................896
Selecting STP Root....................................................................................................................................................... 898
STP Root Guard.............................................................................................................................................................898
Root Guard Scenario...............................................................................................................................................898
Conguring Root Guard..........................................................................................................................................899
Enabling SNMP Traps for Root Elections and Topology Changes.......................................................................... 900
Conguring Spanning Trees as Hitless........................................................................................................................900
STP Loop Guard............................................................................................................................................................ 900
Conguring Loop Guard..........................................................................................................................................902
Displaying STP Guard Conguration........................................................................................................................... 902
52 SupportAssist..........................................................................................................................................904
Conguring SupportAssist Using a Conguration Wizard........................................................................................905
Conguring SupportAssist Manually...........................................................................................................................905
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