Switching fabrics and control protocols for them

Details Switching fabrics and control protocols for them Switching fabrics and control protocols for them

2004-01-07

2008-07-22

Ngo, Ricky (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S395310, C370S398000

Reexamination Certificate

active

07403484

ABSTRACT:
A network unit for use in a switching fabric stores for each network unit in the switching fabric a respective change identification number. In each unit this number is incremented on each change of state. The unit broadcasts protocol packets which indicates incremented change identification numbers; receives corresponding packets from the other units; and determines when the last change identification numbers in the table are the same for all the units. This allows a control based on whether all the units know that all the other units have been updated in response to all the changes of state in the fabric. The network unit can also participate in a routing algorithm, and particularly a shortest path algorithm, within a fabric that constitutes a single network entity.

REFERENCES:
patent: 5732072 (1998-03-01), Thanner et al.
patent: 6728777 (2004-04-01), Lee et al.
patent: 7027406 (2006-04-01), Shabtay et al.
patent: 7227862 (2007-06-01), Kalkunte et al.
patent: 2002/0118647 (2002-08-01), Maeno
patent: 2002/0172203 (2002-11-01), Ji et al.
patent: 2004/0260834 (2004-12-01), Lindholm et al.
patent: WO 02/23780 (2002-03-01), None
Valdevit, Ezio; “Fabric Shortest Path First (FSPF)”,Mar. 2000, Brocade Communication Systems Inc.,Revion 0.1, pp. 1-10.
“True Router Performance Testing”, brochure produced by Agilent Technologies with a copyright date of 2000.
Recent version (RFC 2328) of the OSPF (open shortest path first) routing protocol cited by the British Examiner (the RFC 2178 document), Jul. 1997.

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