Excessive MSTP Round Trip Token Time

Overview:

The "Excessive MSTP Round Trip Token Time" diagnostic fails when the average token round-trip time is more than 2 seconds. The optimal token round-trip time is recommended to be <85ms and should never exceed 2 seconds.

Causes

• Wiring Issues: Loose or damaged wiring, flipped polarity, improper termination, or other physical wiring issue.

• Offline Device(s)

• Too Many Masters: The network may have too many master devices that hold onto the token longer because they have more to say.

• “Chatty” Devices: Device(s) that are trying to talk too much.

Implications:

Communication Failures: Excessive MSTP Round Trip Token Time can cause communication conflicts, and lost messages.

How to fix it:

Use OptigoVN Site Scope(s) to identify devices with Excessive MSTP Round Trip Token Times and other failed MSTP diagnostics. Then, verify the terminations at these devices and ensure everything is properly connected.