Siemens SCALANCE XB-200 Configuration Manual page 199

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.
● 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.
SCALANCE XB-200/XC-200/XP-200 Web Based Management
Configuration Manual, 07/2016, C79000-G8976-C360-04
Configuring with Web Based Management
5.5 The "Layer 2" menu
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