Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2003-07-10
2009-12-08
Hsu, Alpus H (Department: 2619)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S351000, C370S404000, C370S406000, C398S003000, C398S059000
Reexamination Certificate
active
07630300
ABSTRACT:
Methods and apparatus for switching Fiber Channel Arbitrated Loop Systems is provided between a plurality of Fiber Channel Loop devices. In one aspect of the invention, the system switches based at least in part on arbitrated loop primitives. An exemplary interconnect system may include a first port and a second port, both including port logic to monitor certain arbitrated loop primitives, a connectivity apparatus, a route determination apparatus including a routing table consisting of ALPA addresses and their associated ports, the route determination apparatus coupled to each port and the connectivity apparatus, where the connectivity apparatus creates paths between the ports based on arbitrated loop primitives. In one embodiment, the connectivity apparatus is a crossbar switch. Examples of the arbitrated loop primitives that cause the switch to create paths between ports includes one or more of the following: ARB, OPN and CLS. In yet other aspects, the system ensures device access fairness through one or more techniques, including a rotating priority system, a counter to count the number of OPNs, especially sequential OPNs, and/or priority based on port type. Device zoning may be implemented. In one implementation, the system includes trunking such that frames may be transferred on multiple ports.
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Goodwin William
Hammond-Doel Thomas
Mies Carl
Warren Bruce Gregory
White Michael L.
Emulex Design & Manufacturing Corporation
Hsu Alpus H
Morrison & Foerster / LLP
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