Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2004-11-18
2011-11-22
Ahmed, Salman (Department: 2476)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S401000
Reexamination Certificate
active
08064451
ABSTRACT:
A method for using network address translation in switches and routers to define a virtual host as the source of a multicast channel within a single-source multicast model and to translate packet addresses from different multicast sources so that the packets appear to be originating from the virtual host. Address-translated packets are thus forwarded through a single-source multicast channel and received by the subscribing host(s)/clients as though the packets came from a single “virtual” source. This methodology can be used to map two or more sources simultaneously onto the same multicast channel. Such a mapping is useful, for example, to present multiple views of a sporting event video broadcast, provide advertisement insertion capability, or to support transparent fail-over to a backup video source in a critical multicast application. Subscribing client hosts in the multicast reception group simply subscribe to the single virtual host as the source of a multicast channel.
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Ahmed Salman
Campbell Stephenson LLP
Cisco Technology Inc.
Weidner Timothy J
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