Extreme Networks ExtremeWare XOS Guide Manual page 13

Chapter 20: Spanning Tree Protocol............................................................................................. 423
Overview of the Spanning Tree Protocol.....................................................................................423
Spanning Tree Domains ...........................................................................................................423
Member VLANs .................................................................................................................424
STPD Modes.....................................................................................................................425
Encapsulation Modes.........................................................................................................425
STP States .......................................................................................................................426
Binding Ports....................................................................................................................427
Rapid Root Failover ...........................................................................................................429
STP and Hitless Failover-Modular Switches Only ................................................................429
STP Configurations..................................................................................................................430
Basic STP Configuration ....................................................................................................430
Multiple STPDs on a Port ...................................................................................................433
VLAN Spanning Multiple STPDs .........................................................................................433
EMISTP Deployment Constraints ........................................................................................434
Per VLAN Spanning Tree..........................................................................................................436
STPD VLAN Mapping.........................................................................................................436
Native VLAN .....................................................................................................................436
Rapid Spanning Tree Protocol ..................................................................................................436
RSTP Concepts .................................................................................................................437
RSTP Operation ................................................................................................................439
STP Rules and Restrictions ......................................................................................................447
Configuring STP on the Switch .................................................................................................447
STP Configuration Examples ....................................................................................................448
Basic 802.1D Configuration Example..................................................................................448
EMISTP Configuration Example ..........................................................................................449
RSTP 802.1w Configuration Example..................................................................................450
Displaying STP Settings...........................................................................................................452
Chapter 21: Extreme Standby Router Protocol ............................................................................... 455
Overview of ESRP ...................................................................................................................455
ESRP Modes of Operation ..................................................................................................456
ESRP and ELRP................................................................................................................456
Reasons to Use ESRP ........................................................................................................456
ESRP Concepts.......................................................................................................................456
ESRP-Aware Switches .......................................................................................................458
Standard and Extended ESRP ............................................................................................459
ESRP Domains .................................................................................................................460
Linking ESRP Switches......................................................................................................461
ESRP and Hitless Failover-Modular Switches Only..............................................................461
Determining the ESRP Master ..................................................................................................462
Master Switch Behavior .....................................................................................................463
Pre-Master Switch Behavior................................................................................................463
Slave Switch Behavior .......................................................................................................463
Neutral Switch Behavior ....................................................................................................463
Electing the Master Switch.................................................................................................463
ESRP Failover Time...........................................................................................................464
ESRP Election Algorithms ..................................................................................................465
Configuring an ESRP Domain on a Switch .................................................................................466
Creating and Deleting an ESRP Domain...............................................................................467
ExtremeWare XOS 11.3 Concepts Guide
Contents
13