St General - Siemens SIMATIC NET SCALANCE S615 Configuration Manual

Configuring with Web Based Management
4.7 "Layer 2" menu
4.7.4.2

ST general

The page consists of the following parts.
● The left-hand side of the page shows the configuration of the device.
● The right-hand part shows the configuration of the root bridge that can be derived from the
spanning tree frames received by a device.
Description
The page contains the following boxes:
● Bridge Priority / Root Priority
Which device becomes the root bridge is decided by the bridge priority. The bridge with the
highest priority (in other words, with the lowest value for this parameter) becomes the root
bridge. If several devices in a network have the same priority, the device whose MAC
address has the lowest numeric value will become the root bridge. Both parameters, bridge
priority and MAC address together form the bridge identifier. Since the root bridge manages
all path changes, it should be located as centrally as possible due to the delay of the frames.
The value for the bridge priority is a whole multiple of 4096. Range of values: 0 - 61440
● Bridge Address / Root Address
The bridge address shows the MAC address of the device and the root address shows the
MAC address of the root bridge.
● Root port
Shows the port via which the switch communicates with the root bridge.
● Root Cost
The path costs from this device to the root bridge.
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SCALANCE S615 Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C388-08