network protocols handbook.pdf

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296Protocols GuideIBM ProtocolsProtocol StructureA simple APPN network is illustrated in the diagram below:End NodeEnd NodeAPPN NetworkNetwork NodesLow-entrynetwork nodeFigure 2-24: IBM APPN Network Illustration.Related protocolsSNA, APPCSponsor SourceAPPN is an IBM network architecture, extended from the IBMSNA.Referencehttp://publib-b.boulder.ibm.com/Redbooks.nsf/RedbookAbstracts/sg243669.html?OpenInside APPN and HPR - The Essential Guide to the Next-GenerationSNAhttp://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/D50L0000/CCONTENTSSNA APPN Architecture Referencehttp://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2006.htm#17531Designing APPN Internetworkshttp://www.javvin.com/protocol/rfc2353.pdfAPPN/HPR in IP Networks (APPN Implementers’ WorkshopClosed Pages Document)
297Protocols GuideIBM ProtocolsProtocol NameDLSw: Data-Link SwitchingprotocolProtocol DescriptionData-link switching (DLSw) provides a forward mechanism fortransporting IBM Systems Network Architecture (SNA) and networkbasic input/output system (NetBIOS) traffic over an IP network.DLSw does not provide full routing, but instead providesswitching at the SNA Data Link layer (i.e., layer 2 in the SNAarchitecture) and encapsulation in TCP/IP for transport over theInternet.DLSw, originally a proprietary IBM protocol, was adopted byIETF as a standard. DSLw version 1 (DSLw v1) defines threeprimary functions:• The Switch-to-Switch Protocol (SSP) is the protocolmaintained between two DLSw nodes or routers.• The termination of SNA data-link control (DLC) connectionshelps to reduce the likelihood of link layer timeoutsacross WANs.• The local mapping of DLC connections to a DLSw circuit.DLSw version 2 (DLSw v2), which was introduced in 1997 inIETF, provides the following enhancements to the version 1:• IP multicast• UDP unicast responses to DLSw broadcasts• Enhanced peer-on-demand routing• Expedited TCP connectionsEach of these features enables DLSw as a scalable technologyover WANs. In DLSw Version 1, transactions occur with TCP.As a result, many operations in a DLSw environment consumecircuits between peers. For example, a multicast requires multipleTCP connections from the source to each peer. With DLSwVersion 2, multicast is distributed using unreliable transport followingtraditional multicast methods.Cisco supports a third version of DLSw called DLSw+. DLSw+predates DLSw Version 2 and provides even further enhancementsto basic DLSw.Protocol StructureVersionnumber8 16 24 32bitHeader LengthRemote data link correlatorRemote DLC port IDMessage LengthReserved FieldMessage typeFlow controlbyte• Version number - Set to 0x31 (ASCII 1) indicating adecimal value of 49. This is used to indicate DLSwversion 1.• Header length - Set to 0x48 for control messagesand 0x10 for information and Independent Flow Controlmessages.• Message length - Specifies the number of bytes withinthe data field following the header.• Remote data link correlator - Works in tandem withthe remote DLC port ID to form a 64-bit circuit ID thatidentifies the DLC circuit within a single DLSw node.The circuit ID is unique in a single DLSw node and isassigned locally. An end-to-end circuit is identified bya pair of circuit IDs that, along with the data-link IDs,uniquely identifies a single end-to-end circuit.• Remote DLC port ID - Works in tandem with the remotedata-link correlator to form a 64-bit circuit IDthat identifies the DLC circuit within a single DLSwnode. The contents of the DLC and DLC Port ID havelocal significance only. The values received from apartner DLSw must not be interpreted by the DLSwthat receives them and should be echoed “as is” to apartner DLSw in subsequent messages.• Message type - Indicates a specific DLSw messagetype. The value is specified in two different fields(offset 14 and 23 decimal) of the control messageheader. Only the first field is used when parsing areceived SSP message. The second field is ignoredby new implementations on reception, but is retainedfor backward compatibility.• Flow control byte - Carries the flow-control indicator,flow-control acknowledgment, and flow-control operatorbits.Related protocolsSDLC, NetBIOS, TCP, SMP, Ethernet, Token Ring, SNASponsor SourceData-Link Switching (DSLw) was originated by IBM and adoptedas a standard by IETF.Referencehttp://www.javvin.com/protocol/rfc1795.pdfData Link Switching: Switch-to-Switch Protocol AIW DLSw RIG:DLSw Closed Pages, DLSw Standard Version 1.0http://www.javvin.com/protocol/rfc2166.pdfDLSw v2.0 Enhancements
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2Network Communication Architecture
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12Protocols GuideTCP/IP Protocolspo
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14Protocols GuideTCP/IP - Applicati
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54Protocols GuideTCP/IP - Transport
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98Protocols GuideTCP/IP - Data Link
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100Protocols GuideTCP/IP - Data Lin
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102Protocols GuideSecurity and VPNP
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104Protocols GuideSecurity and VPN
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120Protocols GuideVoice Over IP(VOI
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150Protocols GuideWANOtherxDSL: Dig
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152Protocols GuideWAN - ATM Protoco
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170Protocols GuideWAN - Broadband A
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178Protocols GuideWAN - PPP Protoco
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188Protocols GuideWAN - Other WAN P
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196Protocols GuideLAN - Ethernet Pr
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204Protocols GuideLAN - Virtual LAN
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210Protocols GuideLAN - Wilress LAN
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216Protocols GuideLAN - Other Proto
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222Protocols GuideMAN ProtocolsProt
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224Protocols GuideMAN Protocols(0).
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226Protocols GuideStorage Area Netw
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228Protocols GuideSAN ProtocolsProt
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230Protocols GuideSAN ProtocolsThe
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240Protocols GuideISO Protocols in
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242Protocols GuideISO Protocols - A
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Page 340 and 341: 324Network Protocols Dictionary: Fr
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