Fabric OS Administrator’s Guide 471
53-1002446-01
Fibre Channel routing concepts
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FIGURE 74 Edge SANs connected through a backbone fabric
• Phantom domains
A phantom domain is a domain emulated by the Fibre Channel router. The FC router can
emulate two types of phantom domains: front phantom domains and translate phantom
domains. For detailed information about phantom domains, refer to “Phantom domains” on
page 473.
Proxy devices
An FC router achieves inter-fabric device connectivity by creating proxy devices (hosts and targets)
in attached fabrics that represent real devices in other fabrics. For example, a host in Fabric 1 can
communicate with a target in Fabric 2 as follows:
• A proxy target in Fabric 1 represents the real target in Fabric 2.
• Likewise, a proxy host in Fabric 2 represents the real host in Fabric 1.
The host discovers and sends Fibre Channel frames to the proxy target. The FC router receives
these frames, translates them appropriately, and then delivers them to the destination fabric for
delivery to the target.
The target responds by sending frames to the proxy host. Hosts and targets are exported from the
edge SAN to which they are attached and, correspondingly, imported into the edge SAN reached
through Fibre Channel routing. Figure 75 illustrates this concept.
= LSAN
Edge SAN 2Edge SAN 1
Backbone
fabric
FC router FC router
E_Port
E_Port
IFL IFL
EX_Port
EX_Port
ISL
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