Transport resource list major node

This topic contains sample transport resource list major node definitions.

A transport resource list major node is used, along with a local SNA major node, to define an APPN host-to-host channel connection. APPN host-to-host channels enable you to use APPN protocols between two channel-attached APPN nodes. The transport resource list element (TRLE) is not a resource, but describes the connectivity characteristics of the multipath channel line that is used for the connection.

For a connection between VTAM® and an adjacent APPN node, the TRLE operand on the PU definition statement in the local SNA major node that defines the adjacent APPN node identifies the TRLE definition statement VTAM uses to route data over the connection.

See the z/OS Communications Server: SNA Network Implementation Guide for more information about MPC connections.

Guideline: To use this function, you must have at least one multipath channel defined between the two nodes. This multipath channel might be an ESCON channel, an IBM® 3088 or a virtual channel-to-channel connection.
To define a transport resource list major node, code the following definition statements:
  • One VBUILD TYPE=TRL definition statement to begin the transport resource list major node
  • One TRLE definition statement for each multipath channel (MPC) connection, such as an APPN host-to-host connection, or a connection to an IBM S/390® Open Systems Adapter.

In addition to the transport resource list major node, you must also define a local SNA major node that defines the channel connection to the adjacent VTAM as an APPN PU. The PU definition statement in the local SNA major node must specify the TRLE operand to identify the particular transport resource list element to be used for the PU.

When an adjacent link station is activated, the TRLE operand on the PU definition statement identifies which TRLE definition statement VTAM uses to route data over the channel. See APPN host-to-host channel connection for a sample local SNA major node used for APPN host-to-host channel connection.

For additional information about APPN host-to-host channel connections, see the z/OS Communications Server: SNA Network Implementation Guide.