Communication Module RSTP Diagnostics
Original instructions
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Introduction
Use the RSTP Diagnostic page to view the status of the RSTP service of the Ethernet communications module. The page displays dynamically generated and static data for the module.
NOTE: Before you can open the diagnostics page, make the connection between the DTM for the target communication module and the physical module.
Open the Page
Access the RSTP Diagnosis information:
Step
Action
1
In the DTM Browser, find the name that is assigned to your Ethernet communications module.
2
Right-click on the module name.
3
Scroll to Device menu → Diagnosis.
4
In the left pane of the Diagnosis window, select the communication module node.
5
Select the RSTP Diagnostic tab to open that page.
Data Display
Use the Refresh Every 500ms checkbox to display the static or dynamic data:
Checkbox
Description
Selected
  • Display data that is dynamically updated every 500 ms.
  • Increment the number at the top of the table each time data is refreshed.
De-selected
  • Display static data.
  • Do not increment the number at the top of the table. That number now represents a constant value.
RSTP Diagnostic Parameters
The RSTP Diagnostic page displays the following parameters for each communication module port:
Parameter
Description
Bridge RSTP Diagnostic:
Bridge Priority
This 8-byte field contains the two-byte value that is assigned to the module’s embedded Ethernet switch.
MAC Address
The Ethernet address of the module, found on the front of the module.
Designated Root ID
The Bridge ID of the root device.
Root Path Cost
The aggregate cost of port costs from this switch back to the root device.
Default Hello Time
The interval at which Configuration BPDU messages are transmitted during a network convergence. For RSTP this is a fixed value of 2 seconds.
Learned Hello Time
The current Hello Time value learned from the root switch.
Configured Max Age
The value (6 ... 40) that other switches use for MaxAge when this switch is acting as the root.
Learned Max Age
The maximum age learned from the root switch. This is the actual value currently used by this switch.
Total Topology Changes
The total number of topology changes detected by this switch since the management entity was last reset or initialized.
Ports ETH 2 and ETH 3 RSTP Statistics:
Status
The port's current state as defined by RSTP protocol. This state controls the action the port takes when it receives a frame. Possible values are: disabled, discarding, learning, forwarding.
Role:
The port’s current role per RSTP protocol. Possible values are: root port, designated port, alternate port, backup port, disabled port.
Cost
The logical cost of this port as a path to the root switch. If this port is configured for AUTO then the cost is determined based on the connection speed of the port.
STP Packets
A value in this field indicates that a device on the network has the STP protocol enabled.
NOTE:
  • Other devices that are enabled for STP can severely affect the network convergence times. Schneider Electric recommends that you disable the STP protocol (but not the RSTP protocol) on every network device that supports STP.
  • The communication module does not support the STP protocol. The module’s embedded switch ignores STP packets.