Configuring FTP to be inspected on non standard port in addition to port 21.
To configure FTP inspection on non standard port, following configuration is required.
NOTE:- In this example we have used port 2100 for FTP inspection.
Class FTP2100 Match port tcp eq 2100
policy-map global_policy class FTP2100 inspect ftp
Assuming that Service-policy is already applied globally, once configure FTP inspection will start on port 2100 along with port 21.