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Status Not under consideration
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Dec 19, 2014

RELATED IDEAS

SCTP (stream control transmission protocol) support for zTPF

our member endpoint platforms and CISCO equipment in the network currently support SCTP. They feel this protocol would make the network more resilient to carrier issues to endpoint connections. They are currently performing a POC with SCTP connections.

Idea priority Medium
  • Guest
    Reply
    |     Oct 14, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/TPF

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF

  • Guest
    Reply
    |     Feb 12, 2015

    z/TPF has no plans to implement SCTP. Most platforms, including z/OS, have not implemented SCTP either because it is not transparent (applications and middleware changes required to use it) and/or because the benefits of SCTP can be achieved today using existing technologies (such as VIPAs and multiple sockets).

    If the customer is concerned about network issues (any node other than the socket endpoints), SCTP is subject to the same lost packet potential as any other protocol (TCP, UDP, and so on) that uses IP as the transport across potentially unreliable networks.

    An application using an SCTP connection with multiple streams is the same as an application using multiple TCP sockets. In either case, the application has to choose with logical path (SCTP stream or TCP socket) to use for a given message and if any packet using that logical path gets dropped by the network, delivery of subsequent messages along that path are delayed.

    Supporting SCTP would be a fairly large effort with no technical benefits over technology already supported.

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