F5 BIG-IP LTM VE with VMware Workstation or VirtualBox

Can't really speak for VirtualBox, but in WorkStation the first interface is always the management port. The others are (usually) in order after that, but I've found that to not always be true. Your best bet if they aren't in order, after accessing via management, is to create the VLANs with no interfaces, assign self-IPs to the VLANs, and then add an interface to a VLAN while pinging it from another box.