As long as the BDs are L2 only, no ERSPAN can be used in the Fabric. When a BD is L3 and the ERSPAN destination IP is learned in the BD/EPG, ERSPAN will work. Regards

So what do you mean with "Destination outside of the fabric" and "a VM that is within the ACI fabric, but will need to migrate outside"?

Hi @joeharb , If you mean having the ERSPAN destination behind a L3Out connection, that is not possible. The destination must be learned as local Endpoint in the Fabric (meaning not L3Out). https://www.cisco.com/c/en/us/td/docs/switches/datacenter/ac...