Subject: SNA over Frame Relay

From: [email-masked]
Date: Tue, 2 Nov 93 17:22:20 EST

Dear all,

I would like to find out what are the documents, RFCs apart from
RFC-1294 and/or RFC-1490 that I need to follow to implement SNA over
Frame Relay.

The RFCs 1294 and 1490 only talk about the encapsulation method.
Which logical link protocol does SNA over Frame Relay used?  Is it a
flavor of LLC2?

The diagram below shows the sort of connection I would like to make:

                       +-----------+
                       |           |
                       |           |
                       |           |
                       |   3745    |
                       |           |
                       |           |
                       |           |
                       +-----------+
                            |
                            |/|
                            / | Frame Relay
                              |
                              |
                          /---^---\
                         /         \
                        /    FR     \
                        \  Network  /
                         \         /
                          \-------/
                             |
                             |/|
                             / | Frame Relay
                               |
                      +----------------+
                      |     SDLC       |
                      |  Conversion    |
                      |    device      |
                      +----------------+
                            |
                            |/|
                            / |
                              |
                              |
                        +-----------+
                        |   3174    |
                        |           |
                        +-----------+

What is the protocol stack on the Frame Relay side of the SDLC
conversion box I need to have?

Thanks,
Hung.
==============================================================
Hung Bui                           Internet: [email-masked]
Netrix Corporation                    Phone: +1 703 793 1016
13595 Dulles Technology Drive           Fax: +1 703 713 3805
Herndon Va 22071
==============================================================

---

From: "Jim (J.) Cobban" <[email-masked]>
Date: Wed, 3 Nov 1993 09:19:00 +0000

The protocol encapsulation for SNA over frame-relay is discussed in
Frame Relay Forum Technical Committee document TRF 92.32R2 by Rao Cherukuri
of IBM.  Extensions to that protocol are summarized in Appendix A.2 of the
HPR draft specification at ibmstandards.cary.ibm.com.

I would suggest to IBM that an electronic copy of TRF 92.32R2 should be
placed on the anonymous FTP server for completeness.  My own hardcopy is a
photocopy of a fax.

In summary SNA over frame relay uses NLPID X'08' indicating the use of Q.933
protocol identification.  This is followed by 2 bytes indicating the use of
802.2 as the level 2 protocol (X'4C80') or of the null level 2 protocol for
use with APPN HPR (X'5081').  This is followed by 2 bytes which
indicates the level 3 protocol (X'7081' = SNA subarea FID4, X'7082' = SNA
peripheral FID2, X'7083' = SNA APPN FID2, X'7084' = NetBIOS, X'7085' = SNA
APPN HPR (NLP)).  This is followed by the DSAP, the NSAP, and the control
field.