Siemens SCALANCE X-300 Configuration Manual page 207

In the "Bridge Forward Delay" input box, enter the time before the new information is
used.
The default value for this parameter is 15 seconds.
The "Root Forward Delay" display box shows the time until the new information is used at
the root bridge.
● Bridge Max Age [s] / Root Max Age [s]
In the "Bridge Max Age" input box, enter the maximum "Age" that a received BPDU can
have and be accepted as valid by the device.
The default value for this parameter is 20 seconds.
The "Root Max Age" display box shows the setting of the maximum age for a received
BPDU at the root bridge.
● Bridge Max Hop Count
The "Bridge Max Hop Count" input box is only visible if "MSTP" is enabled on the
"General" page and "MSTP" is set for "Protocol Compatibility".
Enter the number of MSTP nodes that a BPDU can pass through in the "Bridge Max Hop
Count" input box.
If an MSTP BPDU is received that has a hop count higher than the value configured here,
it is discarded.
The default value for this parameter is 20.
The following boxes relate to the configuration of the CIST regional root bridge as can be
derived from the MSTP frames.
The displayed data is only visible if "MSTP" is enabled on the "General" page and "MSTP" is
set for "Protocol Compatibility".
● Regional Root Priority
The "Regional Root Priority" display box shows the priority of the CIST regional root
bridge.
● Regional Root Address
The "Regional Root Address" display box shows the MAC address of the CIST regional
root bridge.
● Regional Root Cost
The "Regional Root Cost" display box shows the path costs from this device to the CIST
regional root bridge.
● Region Name
Enter the name of the MSTP region to which this device belongs in the "Region Name"
input box.
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.
SCALANCE X-300 / X-400
Configuration Manual, 10/2014, C79000-G8976-C187-22
Configuration using Web Based Management and Command Line Interface
4.5 The Switch menu
207