HP StorageWorks 2/140 FW 08.01.00 McDATA Products in a SAN Environment Plannin - Page 151
Tier 2, for additional information.
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Implementing SAN Internetworking Solutions 4 • Tier 2 - To connect SAN islands without physically merging the fabrics, the second tier consists of metropolitan storage area networks (mSANs). SAN routers connect fabrics within a data center or campus to form an mSAN and transmit data between fabrics through router ports (R_Ports). Refer to mSAN Routing for additional information. • Tier 3 - To connect geographically remote fabrics or mSANs, the third tier consists of internetworked storage area networks (iSANs). SAN routers transmit data between mSANs through intelligent ports, using Internet Fibre Channel protocol (iFCP). Refer to iSAN Routing for additional information. Figure 4-2 SAN Routing Hierarchy R_Port technology enables inter-fabric SAN routing within a data center or limited geographic area to create mSANs, while iFCP inter-router links (IRLs) connect distributed, extended-distance Fibre Channel fabrics to create an iSAN. In addition, high-availability SAN routers are connected with IRLs using metropolitan Fibre Channel protocol (mFCP). Figure 4-3 illustrates these concepts. Implementing SAN Internetworking Solutions 4-9