network protocols handbook.pdf

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230Protocols GuideSAN ProtocolsThe Ch (Changed) bit indicates whether an echoed FSF hasbeen intentionally altered. The Ch bit SHALL be 0 unless theFSF bit is 1.Related protocolsSCSI, iFCP, FCP, FCIP, mFCP, iSCSI, TCPSponsor SourceFCIP is defined by IETF (www.ietf.org).Referencehttp://www.javvin.com/protocol/rfc3643.pdfFibre Channel (FC) Frame Encapsulationhttp://www.javvin.com/protocol/draft-ietf-ips-fcovertcpip-12.pdfFibre Channel Over TCP/IP (FCIP)
231Protocols GuideSAN ProtocolsProtocol NameiFCP: Internet Fibre ChannelProtocolProtocol DescriptionInternet Fibre Channel Protocol (iFCP) is a gateway-to-gatewayprotocol, which provides fibre channel fabric services to fibrechannel devices over a TCP/IP network. iFCP uses TCP to providecongestion control, error detection and recovery. iFCP’s primaryobjective is to allow interconnection and networking of existingfibre channel devices at wire speeds over an IP network.The protocol and method of frame address translation definedpermit the attachment of fibre channel storage devices to an IPbasedfabric by means of transparent gateways.The fundamental entity in Fibre Channel is the fibre channelnetwork. Unlike a layered network architecture, a fibre channelnetwork is largely specified by functional elements and the interfacesbetween them. These consist, in part, of the following:a) N_PORTs -- The end points for fibre channel traffic.b) FC Devices -- The fibre channel devices to which theN_PORTs provide access.c) Fabric Ports -- The interfaces within a fibre channel networkthat provide attachment for an N_PORT.d) The network infrastructure for carrying frame traffic betweenN_PORTs.e) Within a switched or mixed fabric, a set of auxiliary servers,including a name server for device discovery andnetwork address resolution.The iFCP protocol enables the implementation of fibre channelfabric functionality on an IP network in which IP componentsand technology replace the fibre channel switching and routinginfrastructure.The main function of the iFCP protocol layer is to transport fibrechannel frame images between locally and remotely attachedN_PORTs. When transporting frames to a remote N_PORT, theiFCP layer encapsulates and routes the fibre channel framescomprising each fibre channel Information Unit via a predeterminedTCP connection for transport across the IP network.When receiving fibre channel frame images from the IP network,the iFCP layer de-encapsulates and delivers each frame to theappropriate N_PORT. The iFCP layer processes the followingtypes of traffic:a) FC-4 frame images associated with a fibre channel applicationprotocol.b) FC-2 frames comprising fibre channel link service requestsand responsesc) Fibre channel broadcast framesd) iFCP control messages required to setup, manage orterminate an iFCP session.Protocol StructureFibre Channel Frame Encapsulation Header Structure – iFCPspecific:8 16 24 32bitProtocol # Version -Protocol # -VersionLS_Command_ACCReserved (must be zero)IFCP Flags SOF EOFFlags Frame Length -Flags -Frame LengthTime Stamp (integer)Time Stamp (fraction)CRCCommon fields:• Protocol# - IANA-assigned protocol number identifyingthe protocol using the encapsulation. For iFCP,the value assigned by [ENCAP] is 2.• Version - Encapsulation version as specified in [EN-CAP]• -Protocol# - One’s complement of the protocol#• -Version – One’s complement of the version• Flags - Encapsulation flags• Frame Length - Contains the length of the entire FCEncapsulated frame including the FC EncapsulationHeader and the FC frame (including SOF and EOFwords) in units of 32-bit words.• -Flags – One’s complement of the Flags field.• -Frame Length – One’s complement of the FrameLength field.• Time Stamp [integer] - Integer component of theframe time stamp as specified in [ENCAP].• Time Stamp - Fractional component of the time stamp[fraction] as specified in [ENCAP].• CRC - Header CRC. MUST be valid for iFCP.iFCP specific fields:LS_COMMAND_ACC - For a special link service ACC responseto be processed by iFCP, the LS_COMMAND_ACC field SHALLcontain a copy of bits 0 through 7 of the LS_COMMAND towhich the ACC applies. Otherwise the LS_COMMAND_ACCfield SHALL be set to zero.iFCP Flags - iFCP-specific flags:Reserved SES TRP SPCSES: Session control frameTRP: Transparent mode FlagSPC: Special processing flag
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ITable of ContentsTable of Contents
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IVTable of ContentsCR-LDP: Constrai
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VITable of ContentsCOPS: Common Ope
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VIIITable of ContentsGARP: Generic
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XTable of ContentsIGRP: Interior Ga
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XIVPerfacePrefaceWe are living in t
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2Network Communication Architecture
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10Network Communication Architectur
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12Protocols GuideTCP/IP Protocolspo
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14Protocols GuideTCP/IP - Applicati
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52Protocols GuideTCP/IP - Session L
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54Protocols GuideTCP/IP - Transport
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64Protocols GuideTCP/IP - Network L
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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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280Protocols GuideNovell NetWare an
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288Protocols GuideIBM ProtocolsSNAT
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290Protocols GuideIBM ProtocolsProt
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292Protocols GuideIBM ProtocolsSNA
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300Protocols GuideAppleTalk: Apple
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302Protocols GuideDECnet and Protoc
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304Protocols GuideSS7 / C7 Protocol
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318Protocols GuideOther Protocols
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320Protocols GuideOther ProtocolsPr
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322Protocols GuideOther ProtocolsPr
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324Network Protocols Dictionary: Fr
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342Network Communication Protocols
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