RFC 2114 (rfc2114) - Page 1 of 22
Data Link Switching Client Access Protocol
Alternative Format: Original Text Document
Network Working Group S. Chiang
Request for Comments: 2114 J. Lee
Category: Informational Cisco Systems, Inc.
Obsoletes: 2106 H. Yasuda
Mitsubishi Electric Corp.
February 1997
Data Link Switching Client Access Protocol
Status of this Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
Abstract
This memo describes the Data Link Switching Client Access Protocol
that is used between workstations and routers to transport SNA/
NetBIOS traffic over TCP sessions. Any questions or comments should
be sent to dcap@cisco.com.
Table of Contents
1. Introduction ............................................ 2
2. Overview ................................................ 2
2.1 DCAP Client/Server Model ............................... 2
2.2 Dynamic Address Resolution ............................. 3
2.3 TCP Connection ......................................... 4
2.4 Multicast and Unicast (UDP) ............................ 4
3. DCAP Format ............................................. 6
3.1 General Frame Format ................................... 6
3.2 Header Format .......................................... 6
3.3 DCAP Messages .......................................... 7
3.4 DCAP Data formats ...................................... 8
3.4.1 CAN_U_REACH, I_CAN_REACH, and I_CANNOT_REACH Frames .. 8
3.4.2 START_DL, DL_STARTED, and START_DL_FAILED Frames ..... 9
3.4.3 HALT_DL, HALT_DL_NOACK, and DL_HALTED Frames ......... 13
3.4.4 XID_FRAME, CONTACT_STN, STN_CONTACTED, INFO_FRAME,
FCM_FRAME, and DGRM_FRAME ............................ 14
3.4.5 DATA_FRAME ........................................... 15
3.4.6 CAP_XCHANGE Frame .................................... 16
3.4.7 CLOSE_PEER_REQ Frames ................................ 19
3.4.8 CLOSE_PEER_RSP, PEER_TEST_REQ, and PEER_TEST_RSP Frames 20
4. Protocol Flow Diagram ................................... 20
5. Acknowledgments ......................................... 22
6. References .............................................. 22
Chiang, et. al. Informational
