Siemens CP 1515 Operations Instructions download pdf (Page 193)

Configuration Using Web Based Management and the Command Line Interface

C79000-G8976-C184-07

193

gy Using the Configuration Frames

rk components exchange configuration frames known as BPDUs (Bridge

e is

e root bridge is

g tree algorithm for all involved components.

atus change of the bridge ports.

Rapid Spanning Tree

The rapid spanning tree algorithm is based on the spanning tree algorithm. This

es for

● Edge ports

configuration frames). When the hello time has elapsed, the

station can be certain that no further configuration frame will arrive and that this

port is an edge port. If the user wants to avoid the hello time, spanning tree can

disabled at this port.

ate Port (substitute for the root port)

ee, ports affected by a reconfiguration are immediately

deleted from the filter table. With spanning tree, on the other hand, the point at

which a port is deleted is decided by the time when the port was entered in the

filter table.

● Reaction to events

Rapid spanning tree reacts to events, for example an aborted connection,

without delay. There is no waiting for timers as in spanning tree.

In principle, therefore with rapid spanning tree, alternatives for many parameters

are preconfigured and certain properties of the network structure taken into

account to reduce the reconfiguration time.

Definition of the Network Topolo

Netwo

Protocol Data Unit) with each other to calculate the topology. The root bridg

selected and the network topology created using these frames. Th

the bridge that controls the spannin

BPDUs also bring about the st

was optimized in terms of the reconfiguration time. Typical reconfiguration tim

spanning tree are between 20 and 30 seconds. With rapid spanning tree, the

reconfiguration times are around 1 second. This was achieved by the following

measures:

A port defined as an edge port is activated after the hello time (the time

between two

● Point to Point (direct communication between two neighboring stations)

By directly linking network components, a status change (reconfiguration of the

ports) can be made without any delays. A point-to-point connection can, for

example, be a WDS connection between two access points.

● Altern

A substitute for the root port is configured. If the connection to the root bridge

lost, the station can establish a connection over the alternate port without any

delay by reconfiguring.

● Filter table

In rapid spanning tr

Operating Instructions SCALANCE W78x

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