Visara CNA-8000 Installation - Manual (Page 43)

CNA-8000 Installation and Configuration
707158-003 3-1
Chapter 3. Connectivity Overview
This chapter attempts to give you an overview of how the gateway functions provided by
the CNA-8000 work, to give you more insight as to what is required to properly
configure the platform to achieve your goals.
SNA Gateway
The SNA Gateway function of the CNA-8000 can be managed in a couple of different
ways. Gateway circuits can be statically configured or dynamically configured.
Static configuration of the SNA gateway involves configuring a drop on one of the
network cards for each downstream PU2 platform that is to use the gateway by MAC
address and SAP. Platforms attempting to connect will be checked against the list of
configured circuits and will be allowed to connect if there is a match. The client platform
will next be allowed to contact VTAM for XID negotiation. If VTAM likes the XID the
platform will get a connection. Otherwise the client will be promptly disconnected.
Dynamic configuration involves creating a dynamic drop on one or more of the network
cards that downstream PU2 platforms will connect to. No attempt will be made by the
CNA-8000 to validate the connecting platform against any list of prospective
downstream clients, and the connecting XID exchange will be passed upstream for
VTAM to allow or disallow.
If both static and dynamic connections are permitted, different local SAPs are typically
used to keep static and dynamic connections differentiated.
When supporting LLC clients, you can configure dynamic or static drops. When
configuring dynamic drops, no gateway circuit is required. Static drops each require a
separate gateway circuit.
DLSw clients require a gateway circuit to be defined. If DLSw clients are to be statically
configured, one gateway circuit for each PU2 client is required. If dynamic connections
are to be supported then only one gateway circuit for each remote DLSw gateway is
required, and multiple PU2 platforms can be routed through each DLSw gateway.
SDLC PU2 clients each require a static gateway circuit configuration. This static gateway
circuit includes assigning a virtual LLC MAC address and virtual SAP for use by the
gateway circuit when communicating with VTAM.
Please use the following sections to assist in planning for your configuration.