HP P4459A Installation & Operation Manual page 15

Introducing the HP P4459A 8-Port Fibre Loop Switch
that it is ready to participate by sending a LIP. Obviously, this interrupts any
traffic in progress on that switch port, or on another switch port that is involved
in a connection with a device on that switch port. However, it need not disrupt
communications on any other switch port. Upon receiving a LIP, the switch
conducts a series of passive tests on the new node, to verify that it is well-
behaved.
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