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RFC1490 Format
Subscriber IDs
PU1 Devices
3x74s/SDLC over Frame Relay to SNA Host
Introduction to Database Configuration
An RFC1490 format used for SNA traffic is configured in the frame relay LLC2
Interface/Bridge Port record. The options, in order of lowest overhead to highest
overhead, are:
Native LLC2 (also known as BNN, or Boundary Network Node). When this
format is used, no MAC addresses are transmitted across the frame relay link.
802.5 SRB (source route bridge) (also known as BAN, or Boundary Access
Node. (FRM devices support BAN type 1). This format is generally used for
3174 gateways and AS/400s, because they need to see a MAC address).
802.3 TB (transparent bridge), used when talking to routers that cannot do BAN
or BNN.
Subscriber IDs are only used locally within each FRM to link records (e.g. SDLC PU
record to LLC host record), unless the device is running X.25, SDLC/LLC2 primary
(the FRM would be SDLC secondary to the FEP), or logical ports (i.e., QLLC), in
which case the subscriber IDs correlate to the static routes defined in the subscriber
routing tables.
PU1 devices can not be defined as Token Ring attached to the AS/400. AS/400 pro-
grammers might try to get around this by defining different device types (i.e., 5494/
PU 2.0 or PU 2.1) to 5294 and 5394 PU1 controllers. However, when this is done, the
ACTPU is not spoofed internally, and is sent to the remote controller. The FRM
cannot accept and respond, and the controller and AS/400 will go into error mode.
The 5394 can be RPQed to act as a PU2.1 device (see IBM RPQ 8Q0775); 5294 con-
trollers cannot be RPQed, and must be attached as SDLC devices; there are no issues
with the 5494, as it is a PU2.0/2.1 node. 5294s and 5394s can only be directly con-
nected to FRM devices via SDLC or X.25 with speeds up to 64 kbps. 5494s can be
connected via SDLC or frame relay with speeds to 128 kbps, or by Token Ring or
Ethernet/802.3.
Host
FEP/
NCP
Figure 3-6 Configuration Example 4
Configure the following in the local FRM:
RLP parameters
which the protocols will run. Configure frame relay on the RLP containing the
port to the network, and configure SNA on the RLP containing the port to the
FEP.
Local
FRM
(Chapter 5), to configure the RLP(s) that contain the ports over
Frame
Remote
Relay
FRM
3X74
3-7
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