User guide

Contents
vi OmniSwitch 6600 Family Network Configuration Guide April 2005
Bridge Configuration Commands Overview ..........................................................5-12
Selecting Bridge Protocol .......................................................................................5-14
Configuring the Bridge Priority .............................................................................5-14
Configuring the Bridge Hello Time .......................................................................5-15
Configuring the Bridge Max Age Time .................................................................5-16
Configuring the Bridge Forward Delay Time ........................................................5-17
Enabling/Disabling the VLAN BPDU Switching Status .......................................5-18
Configuring the Path Cost Mode ............................................................................5-18
Configuring Spanning Tree Port Parameters ................................................................5-19
Bridge Configuration Commands Overview ..........................................................5-19
Enabling/Disabling Spanning Tree on a Port .........................................................5-21
Spanning Tree on Link Aggregate Ports .........................................................5-21
Configuring Port Priority .......................................................................................5-22
Port Priority on Link Aggregate Ports .............................................................5-23
Configuring Port Path Cost ....................................................................................5-23
Path Cost for Link Aggregate Ports .................................................................5-25
Configuring Port Mode ..........................................................................................5-26
Mode for Link Aggregate Ports .......................................................................5-27
Configuring Port Connection Type ........................................................................5-27
Connection Type on Link Aggregate Ports .....................................................5-28
Sample Spanning Tree Configuration ...........................................................................5-29
Example Network Overview ..................................................................................5-29
Example Network Configuration Steps ..................................................................5-30
Verifying the Spanning Tree Configuration .................................................................5-32
Chapter 6 Using 802.1s Multiple Spanning Tree ..................................................................6-1
In This Chapter ................................................................................................................6-1
MST Specifications .........................................................................................................6-2
Spanning Tree Bridge Parameter Defaults ......................................................................6-2
Spanning Tree Port Parameter Defaults ..........................................................................6-3
MST Region Defaults .....................................................................................................6-3
MST General Overview ..................................................................................................6-4
How MSTP Works ...................................................................................................6-4
Comparing MSTP with STP and RSTP ...................................................................6-7
What is a Multiple Spanning Tree Instance (MSTI) ................................................6-7
What is a Multiple Spanning Tree Region ...............................................................6-8
What is the Common Spanning Tree .......................................................................6-9
What is the Internal Spanning Tree (IST) Instance ..................................................6-9
What is the Common and Internal Spanning Tree Instance .....................................6-9
MST Configuration Overview ......................................................................................6-10
Using Spanning Tree Configuration Commands ...................................................6-10
Understanding Spanning Tree Modes ....................................................................6-11
MST Interoperability and Migration .............................................................................6-12
Migrating from Flat Mode STP/RSTP to Flat Mode MSTP ..................................6-12
Migrating from 1x1 Mode to Flat Mode MSTP .....................................................6-13
Quick Steps for Configuring an MST Region ...............................................................6-14