Cist General - Siemens SCALANCE W780 Configuration Manual

5.7.3.2

CIST general

MSTP-CIST configuration
The page consists of the following parts.
● The left-hand side of the page shows the configuration of the device.
● The central part shows the configuration of the root bridge that can be derived from the
spanning tree frames received by an device.
● The right-hand side shows the configuration of the regional root bridge that can be
derived from the MSTP frames received by an device. The displayed data is only visible if
you have enabled "MSTP" on the "General" page and when "Protocol Compatiblity" is set
to "Spanning Tree". This also applies to the "Bridge Max Hop Count" parameter. If the
device is a root bridge, the information on the left and right matches.
Description
The page contains the following boxes:
● "Bridge Priority" / "Root Priority" input box
The Bridge priority decides which device becomes the root bridge. The bridge with the
highest priority becomes the root bridge. The lower the value, the higher the priority. 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 with a range of values from 0
to 61440.
● Bridge Adresse / Root Adresse
The bridge address shows the MAC address of the device and the root address shows
the MAC address of the root bridge.
SCALANCE W780/W740 to IEEE 802.11n Web Based Management
Configuration Manual, 03/2015, C79000-G8976-C267-08
Configuring with Web Based Management
5.7 "Layer 2" menu
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