Enterasys Networks 9034313-07 manual Spanning Tree Configuration Summary

9

Spanning Tree Configuration

This chapter describes the Spanning Tree Configuration set of commands and how to use them.

For information about...	Refer to page...
Spanning Tree Configuration Summary	9-1
Configuring Spanning Tree Bridge Parameters	9-3
Configuring Spanning Tree Port Parameters	9-34
Configuring Spanning Tree Loop Protect Parameters	9-42

Caution: Spanning Tree configuration should be performed only by personnel who are very knowledgeable about Spanning Trees and the configuration of the Spanning Tree Algorithm. Otherwise, the proper operation of the network could be at risk.

Spanning Tree Configuration Summary

Note: An Enterasys Networks Feature Guide document containing an in-depth discussion of

Spanning Tree configuration is located on the Enterasys Networks web site:

http://www.enterasys.com/support/manuals/

Overview: Single, Rapid, and Multiple Spanning Tree Protocols

The IEEE 802.1D Spanning Tree Protocol (STP) resolves the problems of physical loops in a network by establishing one primary path between any two devices in a network. Any duplicate paths are barred from use and become standby or blocked paths until the original path fails, at which point they can be brought into service.

RSTP

The IEEE 802.1w Rapid Spanning Protocol (RSTP), an evolution of 802.1D, can achieve much faster convergence than legacy STP in a properly configured network. RSTP significantly reduces the time to reconfigure the network’s active topology when physical topology or configuration parameter changes occur. It selects one switch as the root of a Spanning Tree‐connected active topology and assigns port roles to individual ports on the switch, depending on whether that port is part of the active topology.

RSTP provides rapid connectivity following the failure of a switch, switch port, or a LAN. A new root port and the designated port on the other side of the bridge transition to forwarding through an explicit handshake between them. By default, user ports are configured to rapidly transition to forwarding in RSTP.

SecureStack C3 Configuration Guide 9-1