Cist General - Siemens SCALANCE XM-400 Configuration Manual

5.5.10.2

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. The displayed data is only visible if you have enabled "Spanning
Tree"on the "General" page and if "MSTP" is set for "Protocol Compatibility". 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 of the displayed boxes
The page contains the following boxes:
● Bridge Priority / Root Priority
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. 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.
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
Configuring with Web Based Management
5.5 The "Layer 2" menu
293