HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 131
E_Port ISL connectivity. This connectivity is called FICON
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Planning Considerations for Fibre Channel Topologies 3 • FICON port-to-port connectivity is hardware enforced, while FCP port-to-port connectivity is software or hardware enforced (depending on the director or switch firmware release level). - FICON architecture controls connectivity through a host-based HCD program, the CUP, and a director or switch-resident PDCM array. The CUP and PDCM array support hardware enforcement of connectivity control to all port connections; therefore when a director or switch is set to FICON management style, zoning information is restricted by the hardware instead of by the name server. - When a director or switch is set to open systems management style, CUP support and the PDCM array are disabled. For FICON devices attached to the director or switch, the user must manage connectivity to match logical port addressing established through the host-based HCD program. For example if a FICON hosts expects connectivity through logical port address 1C, the user must ensure the host is connected to physical port number 24. Refer to Figure 3-17 and Figure 3-18 for physical port number and logical port address maps. • The FCP protocol supports multiple domains (multiswitch fabrics). The FICON protocol may or may not be limited to a single domain (single-switch fabric), depending on the director or switch firmware release level as follows: - For earlier versions of director or switch firmware (prior to Enterprise Operating System (E/OS) Version 4.0), the FICON protocol is limited to a single domain (single-switch fabric) due to single-byte Fibre Channel link address limitations inherited from ESCON. Consequently, when a director or switch is set to FICON management style (FICON compliant), E_Port connections (ISLs) are not allowed with another fabric switch. The director or switch reports an attempted E_Port connection as invalid and prevents the port from coming online. - For later versions of director or switch firmware (E/OS Version 4.0 and later), the domain field of the destination ID is added to the Fibre Channel link address, thus specifying the link address on source and target fabric elements and enabling E_Port (ISL) connectivity. This connectivity is called FICON cascading. For additional information, refer to FICON Cascading. Planning Considerations for Fibre Channel Topologies 3-45