TRANSFER Installation and Management Guide

Management Domains
The X400 Gateway
068837, Update 1 to 013198 Tandem Computers Incorporated 3–5
Management Domains The nodes in an X.400 system are organized into management domains. As a
TRANSFER system manager, you encounter management domains when you install
and configure your X400 gateway and in X400 recipient names.
Each domain is a collection of nodes; these are connected through MTAs. There are
two types of domains.
Administration
Management Domain
(ADMD)
An Administration Management Domain (ADMD) is managed by an
administration, such as a government, or a public service. ADMDs can send, receive,
and provide intermediate routing for messages.
Private Management
Domain (PRMD)
A Private Management Domain (PRMD) is managed by a private organization, such
as a company like Tandem. Tandem has its own internal TRANSFER network, but
with the X400 gateway correspondents can address messages to recipients in other
networks. Users outside the TRANSFER network are called foreign correspondents
and reside in foreign domains.
PRMDs can send and receive messages, but they cannot relay messages to other
management domains. A PRMD must be either the originating or the recipient
domain for a message. In addition, PRMDs are located within a single country. An
international corporation, for example, defines at least one PRMD for each country
where it operates.
TRANSFER and Domains TRANSFER nodes are grouped into a PRMD domain at configuration time. In a
TRANSFER system, each domain—or group of TRANSFER nodes—has a single
TRANSFER X400 gateway node. When you send a package to a foreign recipient, the
package is transported to the gateway node of the domain and is then exported to the
specified foreign domains.
Figure 3-4 shows a sample X400 network with three domains in two countries. These
domains can be either administration or private domains. In this example, domain
TDM-1 consists of nodes \A1, \A2, and \A3, with node \A2 as the gateway node.
This network uses ADMD-10 to route messages between countries A and B.