@f-15s-mtd You will need to change every switch/port that has a device that you want to pxe boot on. This is an access layer issue not something related to the FOG server or switch to switch communication. The problem is in the “last mile” so to speak.
ref: https://community.cisco.com/t5/other-network-architecture/enable-portfast-on-all-ports/td-p/324511 read down the post because there are switch global commands that you can use.