HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 155
Unlike a conventional Fibre Channel E_Port, a SAN router R_Port, R_Port Operation
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Implementing SAN Internetworking Solutions 4 R_Port Operation To avoid building a large Fibre Channel fabric with its inherent reconfiguration issues, SAN Routing provides any-to-any connectivity (to maximize use of common assets across SAN islands), while retaining the fault isolation characteristics of smaller SANs. SAN routers also support multiple R_Port compatibility modes, making it possible to route OEM versions of a vendor switch, directmarketed versions of a vendor switch, and switches produced by different OEMs. An Eclipse 2640 SAN Router is used to connect multiple Fibre Channel fabrics within a data center, building, or campus. Figure 4-4 shows the example physical connectivity of Fabric 1 (one switch) and Fabric 2 (one director and one switch) through the router. Figure 4-4 SAN Routing - Physical Connectivity Unlike a conventional Fibre Channel E_Port, a SAN router R_Port behaves as a virtual one-port edge switch (with a unique Domain_ID) and terminates Class F traffic at the boundary of the connected fabric. Class F traffic provides control, coordination, and configuration of fabrics. Directors and fabric switches use Class F services to transmit FSPF protocol structures and related link state database information across ISLs. By terminating Class F traffic at an R_Port, switch-toswitch protocols are not passed through the router, and disruptive build fabric events are restricted to each fabric. Implementing SAN Internetworking Solutions 4-11