CICS Transaction Gateway V5 The WebSphere ... - IBM Redbooks

Note that when a single CICS TG for z/OS region is configured to connect to
more than one CICS region, you must use the same NETNAME for all of the
EXCI connections.
Note: It is quite possible to use the same DFHJVPIPE for multiple address
spaces (that is, multiple Gateway daemons). However, in this way if all the
address spaces connect to the same region, they will share the same
connection, and this may adversely affect your ability to monitor traffic
across the connection, and will also require a higher RECEIVECOUNT to
be defined in the SESSIONS definition.
► ACCESSMETHOD
For EXCI connections, this must be specified as inter-region communication
(IRC). EXCI is implemented through the IRC program (DFHIRP), using the
supervisor call (SVC) mode of DFHIRP (as opposed to cross memory).
DFHIRP can use the cross-system coupling facility (XCF) MRO links, but
cannot use MVS cross-memory services (XM).
► PROTOCOL
For EXCI, this must be specified as EXCI.
► CONNTYPE
This is the type of EXCI connection used for non-CICS jobs to communicate
with a CICS region on z/OS. It is a type of MRO request and must be
specified as either specific or generic.
– SPECIFIC: An MRO link with one or more sessions dedicated to a single
user in a client program. For a specific connection, the NETNAME
attribute is mandatory.
– GENERIC: An MRO link with a number of sessions to be shared by
multiple EXCI users. Only one generic EXCI connection can be installed in
each region. For a generic connection, the NETNAME attribute must be
left blank.
► ATTACHSEC
Controls the security checks made using the flowed user ID.
– IDENTIFY: Specifies to CICS that a user ID will be flowed on every
request, but no password is expected as CICS will trust the user ID as
having been already authenticated. When using the CICS TG for z/OS the
user ID will be either the user named in the ECIRequest object or, if null,
the user ID of the thread the ECI request runs under.
Chapter 4. EXCI connections to CICS 69