Duplicate Source Address

Overview

• Similar to Duplicate Device ID, but instead looks at the SNET and SADR.
• This fails if more than one device sends an I-Am with the same Source Network and Source Address.
• In Duplicate Device ID, the DIP switch settings between two devices are different, but the Device IDs are the same. In Duplicate Source Address, you have different Device IDs, but the DIP switch settings are the same.
• If they are on the same network and have the same MAC, this will fail (these are used to derive the Source Address).
• More likely to occur in MS/TP, unlikely in IP and Ethernet (possible, but very unlikely).

Why it fails

• IP or Ethernet: incorrect factory programming.
• Incorrect MS/TP segment setup.

How to fix it

• On an MS/TP device, change the MAC Address
• On an IP or Ethernet device, move it to a different network or replace the device