Data-link switching

Data-link switching

Data-link switching (DLSw) is a tunneling protocol designed to tunnel unroutable, non-IP based protocols such as IBM Systems Network Architecture (SNA) and NBF over an IP network.

DLSw was initially documented in IETF RFC 1434 in 1993. In 1995 it was further documented in the IETF RFC 1795. DSLw version 2 was presented in 1997 in IETF RFC 2166 as an improvement to RFC 1795.

Cisco Systems has its own proprietary extensions to DLSw in DLSw+. According to Cisco, DLSw+ is 100% IETF RFC 1795 compliant but includes some proprietary extensions that can be used when both devices are Cisco. [cite web|url=http://www.cisco.com/en/US/docs/internetworking/technology/handbook/DLSw.html|title=Data-Link Switching (DLSw)|publisher=Cisco|accessdate=2008-09-15]

Some organisations are starting to replace DLSw tunndeling with the more modern IPDLC protocol, which wraps DLC traffic at the Transport Layer rather than the Network Layer. [cite web|url=http://www-1.ibm.com/support/docview.wss?rs=852&uid=swg27006667|title=Understanding Enterprise Extender, Part 1 - Concepts and Considerations|publisher=IBM|accessdate=2008-09-15]

ee also

*IBM Systems Network Architecture
*Microsoft Host Integration Server
*Synchronous Data Link Control

References

External links

* [http://www.faqs.org/rfcs/rfc1434.html RFC 1434 Data Link Switching: Switch-to-Switch Protocol]
* [http://www.faqs.org/rfcs/rfc1795.html RFC 1795 DLSw Standard Version 1.0]
* [http://www.faqs.org/rfcs/rfc2166.html RFC 2166 DLSw v2.0 Enhancements]


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