I am planning on getting a FTD solution on AWS. I currently already has a FMC on the local network. Does anyone know if i can manage it with the FMC on the local network? or do i also need deploy a FMC solution on the AWS network as well?
NGFWv (FTDv) in cloud can be managed either by FMC in AWS or your on-premise environment (physical or virtual). "NGFWv and ASAv in Public Cloud (Azure and AWS)" slides in Cisco Live On-Demand Library is one of public documents explicitly stating this.
As long as IP reachability is present you can manage it. FMC-FTD connectivity uses TCP port 8305 and you need to make sure that is allowed in cloud firewall. Other than that no issues. They don't use multicast which is a problem in cloud.