3.17. Hubs
FC_AL hubs connect devices to the loop. It is a simple way to connect participants in a private loop. There are two types of hubs:
Passive, which only reacts to ports being inserted into or removed from a loop.
Active, which are able to do configuration changes dynamically, based on some controlling protocol.
Some hubs can sense or manage configuration changes in the loop, including:
knowing when NL_Ports are added
knowing when NL_Ports are removed
knowing when address changes occur for an entire set of NL_Ports
switching NL_Ports into or out of a loop
Hubs also provide port bypass circuits to “heal” a loop when a device is removed or fails. This allows for less disruption in operations. Hubs help solve the problems of cabling devices ...
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