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This chapter introduces the SNAP-IX Management Services (MS) application programming interface (API). It includes information about the various types of MS support in SNA and about accessing them through SNAP-IX.
SNA defines the following levels of MS support. Each level corresponds to a different generation of products that implement this support.
An NMVT-level product transfers management information by sending network management vector transports (NMVTs) to, and receiving NMVTs from, a host focal point over a session between the physical unit (PU) in the node that supports the NMVT-level product and the system services control point (SSCP) at the host. This session is called a PU-SSCP session.
NetView Version 2, Release 1 or earlier provides NMVT-level support.
A migration-level product transfers management information by sending and receiving CP_MSUs (Control Point Management Services Unit GDS variables) over an LU-LU session between independent type 6.2 logical units (LUs). A CP_MSU is a simple GDS variable containing an MS major vector. Migration-level focal points can receive alerts, but they do not support other MS categories.
OS/400 is an example of a migration-level product.
An MDS (Multiple Domain Support)-level product transfers management information by sending and receiving MDS_MUs (MDS Message Unit GDS variables) over LU type 6.2 sessions. An MDS_MU consists of a header, with detailed MS routing and correlation information, followed by a CP_MSU containing an MS major vector. MDS-level products can communicate with more than one focal point at the same time, although they use only a single focal point for a particular MS category (such as problem management).
OS/2 Communications Server/2 and NetView Version 2, Release 2 (as a subarea LU rather than a CP) provide MDS-level support.
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