Cabletron Systems MMAC-Plus 9F116-01, User Manual, Page: 143 / 420

Chapter 8
Configuring SNA
SNA ports in Netlink FRX/FRM devices are used to connect IBM hosts with PUs
(physical units), over a frame relay (via RFC1490) or X.25 (via Annex G) network.
Devices attached to FRX/FRM SNA ports can also communicate with any QLLC-
compatible devices that have integral X.25 interfaces (e.g., NPSI on IBM 3725/3745).
Each SNA port can be configured to support SNA hosts (PU 2.1, 4.0 HPAD; NPAD)
or terminals (PU 1.0, 2.0, 2.1 TPAD). A port can also be configured for a transparent
mode (XPAD), which supports HDLC and any of its subset protocols, such as SDLC
(IBM), LAPB (ISO), and BDLC (Burroughs).
An SNA port can act as a physical, as well as logical, DCE or DTE. (Physical and
logical DCE/DTE are ind3ependent; for example, a physical DCE port can be con-
figured as logical DTE.)
To run SNA in an FRX4000 or FRX6000, the following must be configured in the
node's database:
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Node parameters, described in Chapter 3.
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Line Processor(s) that will contain the interface(s) to the user device(s), plus
Line Interface Card(s) supporting the ports that will be the interfaces. See
Chapter 4.
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SNA protocol, as well as frame relay or X.25 if SNA will be transported over
one of those, and LLC-2 if the transport protocol will be frame relay. If LLC-2
will be used, Bridging must also be configured. See Chapter 4 and (if necessary)
Chapter 13 (Bridging).
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Frame relay or X.25 port(s) that will connect to a network or frame relay PVC.
See Chapter 6 (frame relay) or Chapter 7 (X.25).
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SNA port(s) (described later in this chapter) that will connect to the user
devices, if the connection will be SDLC.
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LLC2 hosts and interfaces (described later in this chapter), if the SDLC
device(s) will be connected to the node via a LAN, or if SDLC will be trans-
ported over frame relay per RFC 1490.
●
Subscriber IDs (described later in this chapter) to identify the user devices.