Accessing the switch 4
Bridge Protocol Data Units ................................................................................................................................... 49
Determining the path for forwarding BPDUs ................................................................................................... 49
Spanning Tree Group configuration guidelines .................................................................................................... 50
Default Spanning Tree configuration............................................................................................................... 50
Adding a VLAN to a Spanning Tree Group ..................................................................................................... 50
Creating a VLAN ............................................................................................................................................. 50
Rules for VLAN tagged ports .......................................................................................................................... 50
Adding and removing ports from STGs........................................................................................................... 51
Assigning cost to ports and trunk groups ........................................................................................................ 51
Multiple Spanning Trees....................................................................................................................................... 51
Why do we need Multiple Spanning Trees?.................................................................................................... 51
VLAN participation in Spanning Tree Groups ................................................................................................. 52
Configuring Multiple Spanning Tree Groups ................................................................................................... 52
Port Fast Forwarding ............................................................................................................................................ 54
Configuring Port Fast Forwarding ................................................................................................................... 55
Fast Uplink Convergence ..................................................................................................................................... 55
Configuration guidelines.................................................................................................................................. 55
Configuring Fast Uplink Convergence ............................................................................................................ 55
RSTP and MSTP
Introduction........................................................................................................................................................... 56
Rapid Spanning Tree Protocol ............................................................................................................................. 56
Port state changes .......................................................................................................................................... 56
Port type and link type..................................................................................................................................... 56
RSTP configuration guidelines........................................................................................................................ 57
RSTP configuration example .......................................................................................................................... 57
Multiple Spanning Tree Protocol .......................................................................................................................... 59
MSTP region ................................................................................................................................................... 59
Common Internal Spanning Tree .................................................................................................................... 59
MSTP configuration guidelines ....................................................................................................................... 59
MSTP configuration example .......................................................................................................................... 59
IGMP Snooping
Introduction........................................................................................................................................................... 64
Overview............................................................................................................................................................... 64
FastLeave ....................................................................................................................................................... 64
IGMP Filtering ................................................................................................................................................. 65
Static multicast router...................................................................................................................................... 65
IGMP Snooping configuration example........................................................................................................... 65
Remote monitoring
Introduction........................................................................................................................................................... 74
Overview............................................................................................................................................................... 74
RMON group 1 — statistics............................................................................................................................. 74
RMON group 2 — history................................................................................................................................ 77
RMON group 3 — alarms................................................................................................................................ 79
RMON group 9 — events................................................................................................................................ 83
High availability
Introduction........................................................................................................................................................... 85
Uplink Failure Detection ....................................................................................................................................... 85
Failure Detection Pair...................................................................................................................................... 86
Spanning Tree Protocol with UFD................................................................................................................... 86
Configuration guidelines.................................................................................................................................. 86
Monitoring Uplink Failure Detection ................................................................................................................ 87
Configuring Uplink Failure Detection............................................................................................................... 87
Troubleshooting tools
Introduction........................................................................................................................................................... 90
Port Mirroring........................................................................................................................................................ 90
Configuring Port Mirroring (AOS CLI example)............................................................................................... 91
Configuring Port Mirroring (BBI example) ....................................................................................................... 92
Other network troubleshooting techniques ........................................................................................................... 94
Console and Syslog messages....................................................................................................................... 94
Ping ................................................................................................................................................................. 94
Trace route...................................................................................................................................................... 94
Statistics and state information ....................................................................................................................... 94
