Data-Link Switching: Difference between revisions

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{{Short description|Tunneling protocol}}

== Description ==

'''DLSw (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|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>

'''DLSw (Data-Link Switching)''' is a protocol designed to tunnel non-IP based protocols such as IBM Systems Network Architecture (SNA) and NetBIOS over an IP network.

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, 2012}}</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 [[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>

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 improvement to RFC 1795.

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

==See also==

Cisco Systems has its own proprietary extensions to DSLw in DSLw+. According to Cisco, DSLw+ is 100% IETF RFC 1795 compliant but include some proprietary extensions that can be used when both devices are Cisco.

*[[Microsoft Host Integration Server]]

*[[Synchronous Data Link Control]]

*[[Systems Network Architecture]]

== REFERENCES References==

{{reflist}}

==External links==

[http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/dlsw.htm http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/dlsw.htm]

*[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]

[[Category:Tunneling protocols]]

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

RFC 1434 Data Link Switching: Switch-to-Switch Protocol

{{network-stub}}

RFC 1795 DLSw Standard Version 1.0

RFC 2166 DLSw v2.0 Enhancements

[[Category:Tunneling protocols]]