Scenario: SNA direct connection to a host system

Figure 1 shows the configuration of an iSeries™ system for frame-relay communications with a 3745 Host Controller.

Figure 1. SNA direct connection to 3745 host controller
SNA direct connection to 3745 host controller

The 3745 provides frame-relay network function, and the iSeries is configured as a terminal equipment (TE).

A 64000-bps V.35 line exists between the iSeries and the 3745. The iSeries system might also have data link connection identifier (DLCI) connections to multiple 3745s, 6611s, and RouteXpanders through the 3745. However, these configurations are not shown as part of this scenario.

There is a single permanent virtual circuit (PVC) connection between the iSeries and the host system. This connection supports a 3270 emulation device used to access applications on the host. It also includes a distributed host command facility (DHCF) session.

Configuration for the iSeries system

Use the following commands to configure the iSeries system using an SNA direct connection with the 3745 and the host system:

CRTNWIFR   NWID(FR3745) RSRCNAME(LIN121) +
           INTERFACE(*V35)1 LINESPEED(64000)1 +
           LMIMODE(*TE)2 TEXT('Frame relay connection to 3745')

CRTLINFR   LIND(FR3745) NWI(FR3745) NWIDLCI(26) +
           EXCHID(05636759) TEXT('DLCI connection to the host')

CRCTCLHOST CTLD(FRHOST) LINKTYPE(*FR) APPN(*NO) +
           SWTLINLST(FR3745) MAXFRAME(8182) +
           SSCPID(050000000001) SWTDSC(*YES) +
           TEXT('Remote host system')

CRTDEVDSP  DEVD(FRDHCF) DEVCLS(*RMT) TYPE(3277) +
           MODEL(*DHCF) LOCADR(02) CTL(FRHOST) +
           TEXT('Remote host system dhcf device')

CRTDEVHOST DEVD(FREML) LOCADR(01) RMTLOCNAME(HOSTSYS) +
           CTL(FRHOST) APPTYPE(*EML) +
           TEXT('Emulation device to remote host')
Notes:
  1. The INTERFACE and LINESPEEED parameters must match the characteristics of the line to the 3745.
  2. The LMI mode is the default value of *TE, which means the iSeries acts as the terminal equipment. You must configure the 3745 as the frame handler (FH) by using ANSI Annex D (DLCI 0).
  3. By creating a frame-relay line description (CRTLINFR), you indicate that the DLCI is connected to another device. The device supports the frame-relay SNA direct frame format of RFC 1490, such as the 3745.
  4. The DLCI for the line must match the DLCI that you assigned in the configuration of the 3745.
Parent topic: Scenarios: SNA direct configuration for frame relay