HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.1.x administrator guide (5697 - Page 299
Routing types, Fibre Channel NAT and phantom domains
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Host Proxy host (imported device) Proxy target (imported device) Fabric 1 EX_Port Target E_Port IFL Fabric 2 E_Port IFL 400 MP Router Figure 34 MetaSAN with imported devices Routing types • Edge-to-Edge Occurs when devices in one edge fabric communicate with devices in another edge fabric through one or more Fibre Channel routers. • Backbone-to-Edge Occurs when Fibre Channel routers connect to a common fabric-known as a backbone fabric-through E_Ports. A backbone fabric can be used as a transport fabric that interconnects edge fabrics. Fibre Channel routers also enable hosts and targets in edge fabrics to communicate with devices in the backbone fabric, known as backbone-to-edge routing. From the edge fabric's perspective, the backbone fabric is just like any other edge fabric. For the edge fabric and backbone fabric devices to communicate, the shared devices need to be presented to each other's native fabric. To do so, at least one translate phantom domain is created in the backbone fabric. This translate phantom domain represents the entire edge fabric. The shared physical devices in the edge have corresponding proxy devices on the translate phantom domain. Each edge fabric has one and only one xlate domain to the backbone fabric. The backbone fabric device communicates with the proxy devices whenever it needs to contact the shared physical devices in the edge. The FC-FC Routing Service receives the frames from the backbone switches destined to the proxy devices, and redirects the frames to the actual physical devices. As with an edge fabric, the translate phantom domain can never be the principal switch of the backbone fabric. Front domains are not created; rather, only translate phantom domains are created in the backbone fabric. Devices are exported from the backbone fabric to one or more edge fabrics using LSANs. See "Configuring LSANs and zoning" on page 315 for more information. NOTE: Secure Fabric OS, Management Server Platform services, and interopmode are not supported in the backbone fabric. Fibre Channel NAT and phantom domains Within an edge fabric or across a backbone fabric, the standard Fibre Channel fabric shortest path first (FSPF) protocol determines how frames are routed from the source Fibre Channel device to the destination FC device. The source or destination device can be a proxy device. When frames traverse the fabric through a 400 MP Router, 4/256 SAN Director or DC Director with an FR4-18i in the backbone (BB), the frames are routed to another EX_Port or VEX_Port. Fabric OS 6.1.x administrator guide 299