When an IT admin is troubleshooting an issue on a network, they often need to understand the difference between CRC (cyclic redundancy check) and input errors on a network interface. This article will explain the differences between the two and how to interpret their occurrence on a network device.
What is CRC?
CRC (Cyclic Redundancy Check) is a type of error-detecting code that is used to detect when data has been corrupted during transmission. It works by calculating a checksum from the data, which is then sent along with the data. The receiving device then calculates its own checksum from the data and compares it to the one sent with the data. If the two checksums do not match, the data has been corrupted and the receiving device will send back an error message.
What are Input Errors?
Input errors are errors that occur on a network interface due to packet loss, packet corruption, or other issues. These errors can be caused by a variety of things, including bad cables, faulty hardware, or even a misconfigured router or switch. Input errors can be tracked by monitoring the interface’s input errors counter, which will increment every time an error is detected.
Differences Between CRC and Input Errors
The main difference between CRC and input errors is that CRC errors are caused by corrupted data, while input errors are caused by packet loss, packet corruption, and other issues. In addition, CRC errors are detected by comparing checksums, while input errors are tracked by monitoring the interface’s input errors counter.
Interpreting CRC and Input Errors
When an IT admin notices an increase in either CRC or input errors on a network interface, they should take action to fix the issue. If the errors are caused by CRC, they should look into the cause of the data corruption. This could include faulty cables, bad network hardware, or a misconfigured router or switch.
If the errors are caused by input errors, they should look into the cause of the packet loss or corruption. This could include a congested network, faulty network hardware, or a misconfigured router or switch. In either case, the IT admin should take the appropriate steps to fix the issue.
Conclusion
CRC and input errors are two different types of errors that can occur on a network interface. CRC errors occur when data is corrupted during transmission, while input errors occur due to packet loss, packet corruption, or other issues. IT admins should monitor both types of errors and take the appropriate steps to fix any issues that arise.
