I faced the same issue and as Symantec guy said :
The transport type you see in the Activity monitor represents the transport mechanism between client and media server. In your case, it is likely to be LAN unless your VMware backup host (the client where bpbkar is running) is a SAN Client. You will see the transport type as SAN if your backup host is a SAN Client sending data to a FT media server.
The transport from VMware datastore to VMware backup host is not displayed in Activity Monitor. The only way to confirm the transport type used is to look at bpbkar log.
This is bad because the customer want to see SAN not LAN,
Regards,