Introduction

This document explains design concepts and product implementation for the Ultra Messaging Dynamic Routing Option (DRO).

For policies and procedures related to Ultra Messaging Technical Support, see UM Support.

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The Ultra Messaging Dynamic Routing Option (DRO) consists of a daemon named "tnwgd" that bridges disjoint Topic Resolution Domains (TRDs) by effectively forwarding control and user traffic between them. Thus, the DRO facilitates WAN routing where multicast routing capability is absent, possibly due to technical obstacles or enterprise policies.

FYI: for historical reasons, the DRO has gone by several names:

Gateway
tnwg = "Twenty Nine West Gateway"
UM Router
Dynamic Router
DRO = Dynamic Routing Option

In the UM documentation, the term "DRO" is generally used for brevity, but sometimes various abbreviations that include "tnwg" are used.

DRO Features <-

The DRO includes the following features:

Full bidirectional forwarding
Multi-hop forwarding
Mesh, loop, or alternate path DRO configurations
Automatic rerouting around faults
Support for wildcard receivers
Support of Request/Response messages
Traffic filtering on multiple criteria
DRO resilience
UMP persistence support
UM transport monitoring statistics
Web Monitoring
MIM and UIM forwarding

The following features are not fully supported in this release of the DRO:

Queuing, both ULB and Brokered (including brokered JMS)
Multitransport Threads (MTT)

If you desire any of these features or any configuration or topology not presented in this document, please contact Informatica Support.

Note: The DRO is not directly supported on the OpenVMS platform. UM applications running on the OpenVMS platform, however, can use a DRO running on a different platform, such as Microsoft Windows or Linux.