Data-Link Switching: Difference between revisions

Revision as of 08:34, 16 June 2011

Revision as of 23:57, 25 July 2011

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'''Data-Link Switching''' ('''DLSw''') is a [[tunneling protocol]] designed to tunnel unroutable, non-IP based protocols such as IBM [[Systems Network Architecture]] (SNA) and [[NetBIOS Frames protocol|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. DLSw 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.<ref>{{cite web|url=http://docwiki.cisco.com/wiki/Data-Link_Switching|title=Data-Link Switching (DLSw)|publisher=[[Cisco]]|accessdate=2011-06-16}}</ref>

[[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.<ref>{{cite web|url=http://docwiki.cisco.com/wiki/Data-Link_Switching|title=Data-Link Switching (DLSw)|publisher=[[Cisco]]|accessdate=2011-06-16}}</ref>

Some organisations are starting to replace DLSw tunneling with the more modern [[IPDLC]] protocol, which wraps DLC traffic at the [[Transport Layer]] rather than the [[Network Layer]].<ref>{{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}}</ref>