Data-Link Switching: Difference between revisions

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{{Short description|Tunneling protocol}}

'''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>

Some organisations are starting to replace DLSw tunneling with the more modern [[Enterprise Extender]]<ref>{{cite web |last=IBM Corporation |title=Enterprise Extender |url=http://publib.boulder.ibm.com/infocenter/zos/basics/index.jsp?topic=/com.ibm.zos.znetwork/znetwork_239.htm |accessdate=September 3, 10122012}}</ref> (EE) protocol which is a feature of IBM APPN on z/OS systems. Microsoft refers to EE as [[IPDLC]]. Enterprise Extender uses UDP traffic at the [[Transporttransport Layerlayer]] rather than the [[Networknetwork Layerlayer]].<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>

Cisco deploy Enterprise Extender on their hardware via the IOS feature known as SNAsW (SNA Switch).

==See also==

*[[IBM Systems Network Architecture]]

*[[Microsoft Host Integration Server]]

*[[Synchronous Data Link Control]]

*[[IBM Systems Network Architecture]]

==References==

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[[Category:Tunneling protocols]]

[[Category:Systems Network Architecture|Data-Link Switching]]

[[de:Data Link Switching]]

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