Siemens SIMATIC NET SCALANCE SC-600 Configuration Manual page 240

Configuring with Web Based Management
4.5 "Layer 2" menu
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.
• 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
• 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
• Reset Counters
Click this button to reset the counters on this page.
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SCALANCE SC-600 Web Based Management (WBM)
Configuration Manual, 10/2021, C79000-G8976-C475-03