3.3. Hubs
Hewlett-Packard’s implementation of FC-AL for a private loop includes a hub. 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 our of a loop
Hubs also provide port bypass circuits to “heal” a loop when a device is removed or fails This allows ...
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