Store and forward mode relay

The Transfer CFT Local Administrator store and forward mode enables you to route files from one computer to another via one or more intermediate relays (computers or communication sites). For example, when sending a file from computer A to computer C, where A and C are either not directly connected or have a connection problem, the file is routed via computer B.

In the same way, a file to be sent to clients that are dependent on the final receiver may transmit via intermediate systems and be sent on. This transfer is accomplished using the same protocol from one end to another.

Note This document describes the relay process as it relates to Transfer CFT. You can perform relay transfers using other Axway products as the intermediary site.

The following illustration features 3 Transfer CFTs, where the protocol may be the same or different between relay points:

  • Source [Initial Sender A]
  • Relay [Store and Forward B]
  • Target [Final Receiver C]

Routing a transfer via a relay

Implementing the relay

To implement a relay in conjunction with Central Governance:

  1. Create the flow as described in the Central Governance User Guide.
  2. In the SEND command include at a minimum:
    • The name of the final receiver, for example TARGET_APPLICATION.
    • The name of the flow, for example TEST_RELAY.
    • The file to be transferred, for example report.
    cftutil send part=target_application, idf=test_relay, fname=report
  3. Optionally you can configure target post-processing to automatically send a reply.
  4. cftutil send type=reply, part=&part, idm=idmr, idt=&idt, msg="Received file successfully."

    cftutil end part=&part,idt=&idt

Tip   You can use the script delivered with Transfer CFT Local Administrator in the runtime/exec directory/BIN_re.cmd as a basis for your ACK reply from the target application.
Note When viewing the final transfer in the CG View Cycle Graph, you will see the number of Transfer CFTs involved minus 1 entries and that these entries are linked. In the example above, there would be two entries for the single "report" transfer.

Restrictions

  • You cannot use a distribution list on the relay site, that is, when this site is being used as part of a store and forward flow.
  • Transfer CFT Local Administrator store and forward mode is only possible from a requester/sender (write transfers only, not read).

The following routing transfer concepts are described in this section:

  • The protocol used to implement the store and forward
  • The types of store and forward managed by the Transfer CFT

The processing possibilities using the store and forward site are detailed in the next topic, Store and forward processing .

Protocols to implement store and forward mode

In order to route a file transfer, you must identify the partners involved in the transfer: the initial sender and final receiver of the transfer.

Transfer CFT Local Administrator supports the following protocols for store and forward operations:

  • PeSIT E
  • PeSIT D CFT profile
  • Odette

For these protocol, the objects transferred can be files or messages, in write mode only, the sender requester mode.

These three protocols manage the acknowledgement messages following the reception of a file. See the SEND TYPE = REPLY command. The PeSIT profile protocol also manages the sending of messages. See the SEND TYPE = MESSAGE command.

Store and forward types

Three types of store and forward operations are possible on the initial sending computer:

  • Backup store and forward : After unsuccessfully attempting to connect to a final file receiver (the call retry attempts have expired), Transfer CFT forwards the file to an intermediary site as a backup.
  • Voluntary store and forward : For a given final receiver, the Transfer CFT immediately stores and forwards the file.
  • Forced store and forward : For a given final receiver, Transfer CFT routes a file from the sender to the first intermediary partner. Each site only knows the next (intermediary) partner. When using this mode, the final destination does not actually have to be configured in the source Transfer CFT configuration.

For the corresponding parameter settings see Store and forward processing .

Related Links