Visara FEP-4600 Planning Guide - Manual (Page 32)

Chapter 2. Support of PU 2.0 Platforms
2-14 707117-003
VTAM Gen Requirements when VTAM Local Major Nodes are Used
The VTAM gen requirements for PU 2.0 controllers are also rather simple. When making
the PU 2.0 platforms appear as local 3174s, you must define one or more Local SNA
Major Node definitions. Defining each PU 2.0 platform to have its own Local SNA
Major Node definition has the benefit that if you need to take the definition down to
make a change, you will only affect the PU that you need to make the change to.
An example definition for a PU 2.0 platform communicating through the FEP-4600 using
a local channel definition might look like this:
LOCSNA01 VBUILD TYPE=LOCAL
PUX25001 PU CUADDR=300,
MODETAB=TABPU20,
SSCPFM=FSS,
DLOGMOD=D4A32782,
MAXBFRU=16,
SECNET=YES
LUX25002 LU LOCADDR=2
LUX25003 LU LOCADDR=3
LUX25004 LU LOCADDR=4
LUX25P05 LU LOCADDR=5,
DLOGMOD=SCS
A few notes:
1)
The two low order digits in the CUADDR should match the PU address
(subchannel address) in the FEP-4600 configuration.
2)
SECNET=YES is for the benefit of NetView so that NetView problem
determination will be more accurate.
3)
The value of MAXBFRU indicates the number of buffers (size determined by
IOBUF in the VTAM Start Options) that must be set aside to receive inbound SNA
frames. The minimum value (MAXBFRU x IOBUF) must be at least 265. Larger values
permit larger data transfers on the channel. For tuning purposes, setting the MAXBFRU
value large enough so that an entire inbound frame can be passed at once is usually the
most efficient.
VTAM Gen Requirements when XCA and Switched Major Nodes are Used
If you already have Switched Major Node definitions in use for your PU 2.0 platforms
coming through the 3745’s Token Ring adapters, then you should not have to make any
changes to those definitions at all. You will need to define at least one XCA Major Node
definition for each network adapter that will be used to provide access for the
downstream PUs through the FEP-4600. Each network adapter on the FEP-4600 can
support up to eight XCA definitions, allowing support for up to 2040 DSPUs through
each adapter. These XCA definitions can be directed through the same ESCON interface
to a single or multiple LPARs or even through different ESCON interfaces.
If you need to create new Switched Major Node definitions to define new platforms, you
will need to define IDBLK and IDNUM values in the VTAM PU definition to match the