gtps2m0kACF/SNA Data Communications Reference

Message Routing

The function management message router (FMMR) transmits messages from terminals or logical units attached to 1 processor to applications in a second processor. Here, the communication path is always directed through the first processor. This type of message routing is called level 2 networking.

In a TPF SNA environment, FMMR is only required for non-SNA terminals. However, FMMR can be extended to make use of the cross-domain SNA communication paths (SNA logical units communicate directly with applications in other processors).

The FMMR operates as a host node LU in a TPF system. Therefore, to communicate with the FMMR in another processor, a formal LU-LU session must be established. Message recovery is not provided in an FMMR to FMMR session. Users who require message recovery should communicate with other domains via TPF host node secondary LU support.