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Technical basics

3.8 Spanning Tree

SCALANCE W770/W730 to IEEE 802.11n Web Based Management

40 Configuration Manual, 11/2014, C79000-G8976-C323-03

● Alternate port (substitute for the root port)

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

device can establish a connection over the alternate port without any delay due to

reconfiguration.

● 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.

● Counter for the maximum bridge hops

The number of bridge hops a package is allowed to make before it automatically

becomes invalid.

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.

Multiple Spanning Tree Protocol (MSTP)

The Multiple Spanning Tree Protocol (MSTP) is a further development of the Rapid

Spanning Tree Protocol. Among other things, it provides the option of operating several

RSTP instances within different VLANs or VLAN groups and, for example, making paths

available within the individual VLANs that the single Rapid Spanning Tree Protocol would

globally block.

Note

Default setting

HTTP is enabled as default on the

device.

Common and internal Spanning Tree (CIST)

CIST identifies the internal instance used by the switch that is comparable in principle with

an internal RSTP instance.

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