IPDT is explicitly disabled on every trunk port with the following command:Ģ. They all make suggestions using Cisco IOS command line interface commands.Īrchitect manufacturing zone subnets such that:ġ. Testing has shown that this affects the majority of Ethernet modules sold by Rockwell Automation.Ĭisco is continually updating the latest workarounds. IPDT when activated on a Cisco switch will try to probe for every IP connected on the subnet, regardless of whether it is connected to that switch or not. If this happens, the EtherNet/IP module will immediately go into a duplicate IP state, and stop communicating. When a device becomes disconnected, and then is reconnected within the configurable IPDT timeout period, probe ARP packets may be received by a Logix Ethernet module at the same time as it is in its Address Conflict Detection mechanism. The IPDT feature sends probe ARP packets with a source IP address of 0.0.0.0., the source MAC ID of the switch, and the target IP and MAC ID for the device being probed to check that it is still connected and responsive. The Stratix line of switches will not have “IP device tracking” enabled by default until a permanent solution is in place. This behavior change also removes the ability to turn off IPDT without first turning off any features which require IPDT. IPDT is much more likely to be implemented on Cisco switches as of August, 2013 because of a behavior change which enables this command if any feature which requires it is enabled. When Rockwell Automation EtherNet/IP modules are connected to a subnet containing Cisco switches with "IP device tracking" (IPDT) enabled, the modules may go into a duplicate IP address state after a restart/reset.Īny layer two networks that contain both Rockwell Automation EtherNet/IP modules and Cisco switches running IPDT. Hostname (configif)#no ip device tracking maxįollow the workarounds below depending on your firmware versionĥ68750 False Duplicate IP detection on Ethernet modules when used with Cisco switches Run these two commands to completely disable the ip device tracking function on the affected Cisco switches that have this IOS bug You are here: Cisco Switches with IPDT Cause Duplicate IPsĪllen-Bradley Ethernet module faulting with the following scrolling message:
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