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Technical basics

3.8 Spanning Tree

SCALANCE W770/W730 to IEEE 802.11n Web Based Management

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

The management station sends data packets of the following type:

● GET

Request for a data record from the agent

● GETNEXT

Calls up the next data record.

● GETBULK (available as of SNMPv2)

Requests multiple data records at one time, for example several rows of a table.

● SET

Contains parameter assignment data for the relevant device.

The SNMP agent sends data packets of the following type:

● RESPONSE

The agent returns the data requested by the manager.

● TRAP

If a certain event occurs, the SNMP agent itself sends traps.

SNMPv1 and SNMPv2 and SNMPv3 use UDP (User Datagram Protocol). The data is

described in a Management Information Base (MIB).

SNMPv3

Compared with the previous versions SNMPv1 and SNMPv2. SNMPv3 introduces an

extensive security concept.

SNMPv3 supports:

● Fully encrypted user authentication

● Encryption of the entire data traffic

● Access control of the MIB objects at the user/group level

3.8

Spanning Tree

Avoiding loops

The Spanning Tree algorithm detects redundant physical network structures and prevents

the formation of loops by disabling redundant paths. It evaluates the distance and

performance of a connection or bases the decisions on settings made by the user. Data is

then exchanged only over the remaining connection paths.

If the preferred data path fails, the Spanning Tree algorithm then searches for the most

efficient path possible with the remaining nodes.

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Siemens IEEE802.11 Betriebsanleitung Seite 38