Siemens SCALANCE XM-400 Configuration Manual page 294
Industrial ethernet switches
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Also See for SCALANCE XM-400:
- Configuration manual (960 pages) ,
- Operating instructions manual (80 pages) ,
- Instructions manual (60 pages)
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Configuring with Web Based Management
5.5 The "Layer 2" menu
● 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.
● Topology Changes / Last Topology Change
The entry for the device shows the number of reconfiguration actions due to the spanning
tree mechanism since the last startup. For the root bridge, the time since the last
reconfiguration is displayed as follows:
– Seconds: Unit "sec" after the number
– Minutes: Unit min after the number
– Hours: Unit hr after the number
● Bridge hello time [s] / Root hello time [s]
Each bridge sends configuration frames (BPDUs) regularly. The interval between two
configuration frames is the "Hello Time".
Factory setting: 2 seconds
Note
The setting of the "Bridge Hello Time" is only possible with the Protocol compatibility RSTP.
If the "Protocol compatibility MSTP is set, the "Hello Time" parameter on the page "Layer
2 > Spanning Tree > CIST Port" page is used.
● Bridge Forward Delay[s] / Root Forward Delay[s]
New configuration data is not used immediately by a bridge but only after the period
specified in the Forward Delay parameter. This ensures that operation is only started with
the new topology after all the bridges have the required information.
Factory setting: 15 seconds
● Bridge Max Age[s] / Root Max Age[s]
If the BPDU is older than the specified "Max Age" it is discarded.
Factory setting: 20 seconds
● Regional root priority
For a description, see Bridge Priority / Root Priority
● Regional Root Address
The MAC address of the device.
● Regional Root Cost
The path costs from this device to the root bridge.
● Bridge Max Hop Count
This parameter specifies how many MSTP nodes a BPDU may pass through. If an MSTP
BPDU is received and has a hop count that exceeds the value configured here, it is
discarded. The default for this parameter is 20.
● Region Name
Enter the name of the MSTP region to which this device belongs. As default, the MAC
address of the device is entered here. This value must be the same on all devices that
belong to the same MSTP region.
294
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
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