How can I troubleshoot packet loss on a port of the FS S3410 Series switch? (FS S3410 Series Troubleshoot SwitchPort Packet User Guide)

Answer

manuals.plus

Feb 26, 2025 - 10:42 PM

To troubleshoot packet loss on a port of the FS S3410 Series switch, you can follow these steps:

Step 1: Check the port traffic and enable flow control:
- Verify if the port traffic exceeds the interface bandwidth.
- If there is no QoS or spanning tree configuration on the port, try enabling flow control to alleviate the situation.

Step 2: Collect and compare port count information:
- Collect the count of the bottom layer packet statistics (ps) and the "show c" output of the line card.
- Also, collect the upper layer port count to observe the change in the number of port packet loss and identify the source.

Step 3: Check for packets larger than 1518 bytes:
- Check if the bottom layer count contains packets larger than 1518 bytes (the maximum packet length required by Ethernet).
- If there are a large number of such packets, it can lead to the exhaustion of MMU (Memory Management Unit) resources.

Step 4: Identify the source of large flow messages:
- Find the source of the 1518-byte large flow messages sent by the input port and eliminate any problems with the source port.

Step 5: Clear port counters and monitor:
- Use the "clear counter" command to clear the port counters.
- Use the "show int gx/y" command to monitor the interface for any packet loss.
- If packet loss is observed, use the "show int count summ" command to identify the port with larger traffic volume and further investigate.

Step 6: Repeat monitoring and take action:
- Continuously monitor the interfaces with relatively large traffic ports using the "show int gx/y" command.
- If a specific port consistently shows high traffic or packet loss, consider shutting down that port for observation (if conditions permit).

Please note that the above steps are general guidelines for troubleshooting port packet loss on the FS S3410 Series switch. For more specific instructions and detailed information, refer to the FS S3410 Series Troubleshoot The SwitchPort Packet Loss User Guide provided by FS.com.