A Fibre Channel router used to join fabrics. EX_ports are used to connect
to the fabrics. The EX_port joins the fabric but the router will not
merge into the fabric. Ports in the Fibre Channel router can be in a
fabric, but other ports can be connected to other fabrics. Fibre Channel
routers can be interconnected using a backbone fabric. Global,
interfabric and encapsulation headers are developed to allow routing by
conventional Fibre Channel switch devices in the backbone fabric and
simplify Fibre Channel router routing. Phantom domains and devices must
be developed for each of the fabrics being interconnected. Front phantom
domains are present at each port directly connected to a fabric. Each of
these is then connected to at least one translate phantom domain. Zoning
is accomplished by use of a special LSAN zoning naming convention. This
allows each administrator to independently define devices are accessible.