Normally it is desirable for a session between two independent LUs through a subarea network to use the same transmission priority for both type 2.1 LEN connections (entry and exit). By default, when VTAM® receives a BIND over a type 2.1 LEN connection, the transmission priority field received on the BFINIT is passed back on the BFCINIT and through the subarea network on the BIND. This allows this same transmission priority to be used for the session by the type 2.1 LEN connection on exit from the subarea network.

To have VTAM ignore the transmission priority specified on the BFINIT, use the AUTHLEN=NO start option or the AUTHLEN=NO operand on a particular PU definition statement (or on a GROUP or LINE statement to sift down to the PU). VTAM then sets the transmission priority field in the BFCINIT to B'01' (medium priority), regardless of the transmission priority specified on the initial BFINIT.