Chapter 8 Configuring Sna - Cabletron Systems SmartSwitch 6000 User Manual

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:
Node parameters, described in Chapter 3.
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.
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).
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).
SNA port(s) (described later in this chapter) that will connect to the user
devices, if the connection will be SDLC.
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.
Chapter 8
Configuring SNA