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NEWS is linked to VTAM and your SNA network by two Access-method Control Blocks (ACBs), through which specific types of data are channeled.
The ACBs are as follows:
NEWS obtains data from the following sources, using the specified routes:
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Source |
Route |
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The local SNA subarea network |
VTAM System Services Control Point (SSCP) and the CNM ACB |
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The Control Points (CPs) of APPN nodes |
LU 6.2 sessions, which carry SNA management data, and the CA NetMaster NM for SNA primary ACB |
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Connected regions |
Intersystem routing (ISR) connection |
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Applications running on the same host that use PPI |
Program-to-program interface (PPI) |
These forms of data delivery are discussed in the following sections.
The CNM interface lets a suitably authorized CNM application (such as NEWS) maintain a session with an SSCP, to acquire data from Physical Units (PUs) in your SNA network. This session is established when NEWS successfully opens its VTAM CNM ACB, allowing data to be exchanged with the SSCP of the VTAM under which NEWS is running.
NEWS receives the following types of data from the SSCP:
NEWS sends data to the SSCP for the following reasons:
When CA NetMaster NM for SNA starts, a primary ACB that links it to VTAM opens. During initialization, NEWS registers with Multiple Domain Support (MDS) as the ALERT-NETOP application that acts as a focal point for alert collection from your APPN network.
MDS is a component of SNA Management Services (SNAMS), which facilitates the routing of management data between applications. It enables management roles—that is, which node is the focal point for the receipt of which data—to be negotiated between nodes.
For more information about the functions and services associated with SNAMS, see the IBM publication, SNA Management Services Reference.
SNA data units are known as Management Services Units (MSUs). There are various types of SNA MSUs and many reasons for the generation of each type. As a result, NEWS needs to apply rules to classify incoming records, to determine the relative importance of the data that each carries, and whether a response is appropriate.
The SNAMS architecture makes use of SNA Management Services transport, which consists of a number of APPC transactions used to transport SNA MSUs across the network.
The &SNAMS verb enables NCL procedures to participate as management applications in the SNAMS architecture. The partner application can exist in the same CA NetMaster region, a remote CA NetMaster region, or any other region that supports MDS functions.
For more information about the &SNAMS verb, see the Network Control Language Reference Guide.
The Intersystem Routing (ISR) feature enables data to be transparently routed to remote processing environments in other regions.
NEWS takes advantage of ISR to exchange data with remote regions. Requests, including CNM requests, can be routed to remote NEWS regions for processing, and the results returned to the originating region. This can be used to change the operation of, or solicit data from, a device managed by VTAM in the remote region.
ISR also enables a NEWS region to deliver unsolicited records to a remote NEWS region for processing.
By using ISR, you can implement centralized management, resulting in one NEWS region processing all data received by NEWS in linked regions. This lets you control all database logging from one region.
Applications running on the same host can communicate using PPI, a support facility provided by the subsystem interface or Tivoli NetView. Users of PPI can send various types of data to this interface, which then distributes the data to the application registered to receive that particular type of data.
NEWS registers with PPI, as the receiver of generic alerts, to monitor and report on the state of other applications using PPI.
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