Administrator Guide

Stack Master Election.................................................................................................................................................795
Virtual IP....................................................................................................................................................................... 798
Failover Roles...............................................................................................................................................................799
MAC Addressing on Stacks........................................................................................................................................799
Stacking LAG................................................................................................................................................................801
Supported Stacking Topologies.................................................................................................................................802
High Availability on Stacks......................................................................................................................................... 802
Management Access on Stacks................................................................................................................................803
Important Points to Remember.......................................................................................................................................804
Stacking Installation Tasks...............................................................................................................................................804
Create a Stack.............................................................................................................................................................804
Add Units to an Existing Stack.................................................................................................................................. 806
Split a Stack................................................................................................................................................................. 809
Stacking Configuration Tasks..........................................................................................................................................809
Assigning Unit Numbers to Units in an Stack..........................................................................................................809
Creating a Virtual Stack Unit on a Stack...................................................................................................................810
Displaying Information about a Stack........................................................................................................................ 810
Influencing Management Unit Selection on a Stack................................................................................................813
Managing Redundancy on a Stack............................................................................................................................ 814
Resetting a Unit on a Stack........................................................................................................................................ 814
Verify a Stack Configuration.............................................................................................................................................814
Displaying the Status of Stacking Ports....................................................................................................................814
Removing a Unit from a Stack......................................................................................................................................... 816
Troubleshoot a Stack.........................................................................................................................................................817
Recover from Stack Link Flaps...................................................................................................................................817
Recover from a Card Problem State on a Stack..................................................................................................... 818
53 Storm Control.........................................................................................................................819
Configure Storm Control...................................................................................................................................................819
Configuring Storm Control from INTERFACE Mode...............................................................................................819
Configuring Storm Control from CONFIGURATION Mode...................................................................................820
54 Spanning Tree Protocol (STP)..................................................................................................821
Protocol Overview............................................................................................................................................................. 821
Configure Spanning Tree.................................................................................................................................................. 821
Important Points to Remember.......................................................................................................................................822
Configuring Interfaces for Layer 2 Mode.......................................................................................................................822
Enabling Spanning Tree Protocol Globally......................................................................................................................823
Adding an Interface to the Spanning Tree Group.........................................................................................................825
Modifying Global Parameters.......................................................................................................................................... 825
Modifying Interface STP Parameters.............................................................................................................................826
Enabling PortFast..............................................................................................................................................................826
Prevent Network Disruptions with BPDU Guard.................................................................................................... 827
Selecting STP Root...........................................................................................................................................................828
STP Root Guard................................................................................................................................................................ 829
Root Guard Scenario...................................................................................................................................................829
Configuring Root Guard..............................................................................................................................................829
Enabling SNMP Traps for Root Elections and Topology Changes.............................................................................830
Configuring Spanning Trees as Hitless...........................................................................................................................830
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