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Introduction......................................................................................................................................... 68
Overview............................................................................................................................................ 68
Bridge Protocol Data Units .................................................................................................................... 68
Determining the path for forwarding BPDUs........................................................................................ 69
Bridge priority ........................................................................................................................... 69
Port priority ............................................................................................................................... 69
Port path cost ............................................................................................................................ 69
Spanning Tree Group configuration guidelines ........................................................................................ 69
Default Spanning Tree configuration.................................................................................................. 69
Adding a VLAN to a Spanning Tree Group ........................................................................................ 70
Creating a VLAN ............................................................................................................................ 70
Rules for VLAN tagged ports............................................................................................................. 70
Adding and removing ports from STGs .............................................................................................. 70
Assigning cost to ports and trunk groups ............................................................................................ 71
Multiple Spanning Trees ....................................................................................................................... 71
Why do we need Multiple Spanning Trees? ....................................................................................... 71
VLAN participation in Spanning Tree Groups ..................................................................................... 72
Configuring Multiple Spanning Tree Groups.......................................................................................73
Configuring Switch 1 (CLI example) ............................................................................................. 73
Configuring Switch 2 (CLI example) ............................................................................................. 73
Configuring Switch 1 (BBI example) ............................................................................................. 74
Port Fast Forwarding ............................................................................................................................ 76
Configuring Port Fast Forwarding...................................................................................................... 76
Fast Uplink Convergence ...................................................................................................................... 76
Configuration guidelines .................................................................................................................. 76
Configuring Fast Uplink Convergence................................................................................................ 76
RSTP and MSTP
Introduction......................................................................................................................................... 77
Rapid Spanning Tree Protocol................................................................................................................ 77
Port state changes ........................................................................................................................... 77
Port type and link type..................................................................................................................... 78
Edge port.................................................................................................................................. 78
Link type ................................................................................................................................... 78
RSTP configuration guidelines ........................................................................................................... 78
RSTP configuration example ............................................................................................................. 78
Configuring Rapid Spanning Tree (CLI example) ............................................................................ 78
Configuring Rapid Spanning Tree Protocol (BBI example)................................................................ 79
Multiple Spanning Tree Protocol............................................................................................................. 80
MSTP region................................................................................................................................... 80
Common Internal Spanning Tree ....................................................................................................... 80
MSTP configuration guidelines.......................................................................................................... 81
MSTP configuration example ............................................................................................................ 81
Configuring Multiple Spanning Tree Protocol (CLI example)............................................................. 81
Configuring Multiple Spanning Tree Protocol (BBI example)............................................................. 82
Quality of Service
Introduction......................................................................................................................................... 86
Overview............................................................................................................................................ 86
Using ACL filters .................................................................................................................................. 87
Summary of packet classifiers ........................................................................................................... 87
Summary of ACL actions .................................................................................................................. 89
Understanding ACL precedence........................................................................................................ 89