Ring configuration for network switches

专利名称：Ring configuration for network switches发明人：Beaudoin, Denis R.,Szczepanek,

Andre,Robertson, Iain

申请号：EP99203403.3申请日：19991018公开号：EP0996256A3公开日：20041208

专利附图：

摘要：Network switching systems (10, 110, 210, 310, 410) for use in an Ethernetnetwork are disclosed. Each of the switching systems includes switch devices (20)

supporting multiple (e.g., eight) local ports, and one gigabit high-speed port; each of thehigh-speed ports are full-duplex ports. Each switching system also includes a gigabitswitch device (30) having two full-duplex gigabit ports. According to one aspect of theinvention, the switches (20, 30) are connected in a ring using their respective gigabit ports,with each of the switches (20, 30) having a Ring ID value. Upon receipt of a message

packet at one of its local ports, the switches (20) attach a pretag with the Ring ID valueupon the packet, and begin forwarding the packet around the ring until the destinationaddress is registered with one of the switches (20, 30), or until the packet returns to theoriginal switch (20) which, upon detecting its own Ring ID value, filters or discards thepacket. According to another aspect of the invention, switches (20) have their gigabitports connected to a crossbar-matrix switch (100); pretags added by the switches to theirreceived packets indicate the crossbar ports to which the packets are addressed.According to another aspect of the invention, each of the switches (20, 30) applies flowcontrol over the gigabit ports in response to a message occupying more buffer spacethan remaining buffers; this permits buffer space to be utilized when traffic permits,without allowing a small minority of channels to adversely affect others.

申请人：Texas Instruments Incorporated

地址：7839 Churchill Way, Mail Station 3999 Dallas, Texas 75251 US

国籍：US

代理机构：Holt, Michael

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