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v Layer 3 protocol ID = X'7085' SNA APPN/HPR (NLP)
v Enterprise Extender Support for HPR over IP
Refer to Table 2 on page 25 for a list of DLCs that support HPR.
Note: HPR is not supported over SDLC, X.25, or DLSw ports.
Dependent LU Requester (DLUR)
The DLUR option extends the support of T2.0 or T2.1 devices containing dependent
LUs to APPN nodes. The DLUR function on an APPN network node or an APPN
end node works in conjunction with a dependent LU server (DLUS) in a mixed
APPN/subarea network. The DLUS function may reside in some other part of the
mixed network from the DLUR.
The dependent LU flows (SSCP-PU and SSCP-LU) are encapsulated over an LU
6.2 (CP-SVR) pipe established between the DLUR APPN node and the DLUS
SSCP. The CP-SVR pipe is made up of a pair of LU 6.2 sessions using a new
CPSVRMGR mode between the DLUR and the DLUS. This pipe brings the SSCP
function (in the DLUS) to the DLUR APPN node where it can be made available to
attached T2.0/T2.1 nodes containing dependent LUs.
The dependent LU will appear to be located within the domain of the serving SSCP.
Session initiation flows will be emulated from the DLUS, but session bind and data
paths will be calculated directly between the dependent LU and its session partner.
This path may or may not traverse the serving DLUS node.
Set the adjacent node type parameter to PU 2.0 Node when defining a link station
to a T2.0 adjacent node containing dependent LUs. Set the adjacent node type
parameter to APPN end node or LEN end node when defining a link station to a
T2.1 adjacent node containing dependent LUs.
See Table 2 on page 25 for the types of ports providing connection to the
downstream PU (DSPU) that are supported.
Functions Supported
The APPN DLUR option includes the following functions:
v Support for SDLC-attached downstream T2.0 nodes containing dependent LUs
that do not support XID exchange.
v Support for downstream T2.0 nodes containing dependent LUs that respond with
XID type 0 and XID type 1.
v Support for downstream T2.1 nodes containing dependent LUs that respond with
XID type 3.
v Support for dependent LUs that is equivalent to the support provided by the
Subarea environment for:
– Activating PUs and their LUs
– Locate and be located by other LUs in an APPN or subarea network
– Determine LU’s characteristics
– Allow terminal operators to logon to applications both in APPN and subarea
networks
– SSCP takeover
APPN
Chapter 1. APPN 9