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    • 3. 发明申请
    • Flow control in a switch
    • 开关中的流量控制
    • US20060013135A1
    • 2006-01-19
    • US10873330
    • 2004-06-21
    • Steven SchmidtHarry PaulHenry Gonzalez
    • Steven SchmidtHarry PaulHenry Gonzalez
    • G01R31/08
    • H04L47/39H04L47/10H04L47/266H04L49/254H04L49/50
    • A flow control mechanism is presented that provides XON/XOFF flow control for each virtual channel in an interswitch link. The entire interswitch link remains under standard Fibre Channel BB_Credit flow control. Each virtual channel in the interswitch link can submit data to multiple ports in the downstream switch. The XOFF status of each port in the downstream switch is maintained in an XOFF mask. A mapping between each virtual channel and all ports accessible through the virtual channel is then applied to the XOFF mask, which determines the XOFF status of each virtual channel. An XOFF signal is generated by the downstream switch on a change in XOFF status for any virtual channel. The preferred XOFF signal is one or more Fibre Channel primitive containing the status for every virtual channel. Each primitive sends duplicate XOFF information, and always ends in negative running disparity.
    • 提出了一种流控制机制,为交叉连接中的每个虚拟通道提供XON / XOFF流量控制。 整个交换机间链路仍然处于标准的光纤通道BB_Credit流量控制之下。 交叉连接中的每个虚拟通道都可以向下游交换机的多个端口提交数据。 下游交换机中每个端口的XOFF状态保持在XOFF掩码中。 然后将每个虚拟通道和通过虚拟通道访问的所有端口之间的映射应用于XOFF掩码,该掩码确定每个虚拟通道的XOFF状态。 XOFF信号由下游交换机生成,用于任何虚拟通道的XOFF状态改变。 优选的XOFF信号是包含每个虚拟通道的状态的一个或多个光纤通道原语。 每个原语发送重复的XOFF信息,并且始终以负运行差异结束。
    • 4. 发明申请
    • Deferred queuing in a buffered switch
    • 在缓冲交换机中延迟排队
    • US20050088970A1
    • 2005-04-28
    • US10873430
    • 2004-06-21
    • Steven SchmidtAnthony TornettaHarry PaulHenry Gonzalez
    • Steven SchmidtAnthony TornettaHarry PaulHenry Gonzalez
    • H04L12/70H04L12/935H04L1/00G06F11/00G08C15/00H04L12/28H04L12/56
    • H04L49/3009H04L49/30H04L2012/5683
    • A method and apparatus is disclosed for temporarily deferring transmission of frames to a destination in a data switch. When a request for transmission of a frame to the destination port is received, the congestion status of that destination is determined. If the destination is congested, the frame is stored in a deferred queue. When the status of a destination changes from congested to non-congested, the deferred queue is examined to see if any deferred frames can now be forwarded to their destination. While examining the deferred queue, incoming frames are placed on a backup queue. When the deferred queue is fully analyzed, the backup queue is emptied by either sending those frames to their destination or storing the frames in the deferred queue. While examining the deferred queue, the congested states of the destinations are not allowed to change from congested to non-congested.
    • 公开了一种用于在数据交换机中暂时推迟到目的地传送帧的方法和装置。 当接收到向目的地端口发送帧的请求时,确定该目的地的拥塞状态。 如果目的地拥塞,则将帧存储在延迟队列中。 当目的地状态从拥塞状态改变为非拥塞状态时,会检查延迟队列,以查看是否有任何延迟帧现在可以转发到其目的地。 在检查延迟队列时,传入帧将放置在备份队列中。 当延迟队列被完全分析时,通过将这些帧发送到其目的地或将帧存储在延迟队列中,备份队列将被清空。 在检查延期队列时,目的地的拥塞状态不允许从拥塞状态改为非拥塞状态。
    • 5. 发明申请
    • Port congestion notification in a switch
    • 交换机中的端口拥塞通知
    • US20050088969A1
    • 2005-04-28
    • US10873329
    • 2004-06-21
    • Scott CarlsenAnthony TornettaSteven Schmidt
    • Scott CarlsenAnthony TornettaSteven Schmidt
    • H04L12/70H04L12/935H04L1/00G06F7/00G06F11/00G06F17/00G08C15/00H04L12/28
    • H04L49/3009H04L49/30H04L2012/5683
    • A congestion notification mechanism provides a congestion status for all destinations in a switch at each ingress port. Data is stored in a memory subsystem queue associated with the destination port at the ingress side of the crossbar. A cell credit manager tracks the amount of data in this memory subsystem for each destination. If the count for any destination exceeds a threshold, the credit manager sends an XOFF signal to the XOFF masks. A lookup table in the XOFF masks maintains the status for every switch destination based on the XOFF signals. An XON history register receives the XOFF signals to allow queuing procedures that do not allow a status change to XON during certain states. Flow control signals directly from the memory subsystem are allowed to flow to each XOFF mask, where they are combined with the lookup table status to provide a congestion status for every destination.
    • 拥塞通知机制为每个入口处的交换机中的所有目的地提供拥塞状态。 数据存储在与交叉开关入口侧的目标端口相关联的存储器子系统队列中。 小区信用管理器跟踪每个目的地的该存储器子系统中的数据量。 如果任何目的地的计数超过阈值,则信用管理器向XOFF掩码发送XOFF信号。 XOFF掩码中的查找表基于XOFF信号维护每个交换机目的地的状态。 XON历史寄存器接收XOFF信号,以允许在某些状态下不允许状态更改为XON的排队过程。 来自存储器子系统的流量控制信号被允许流向每个XOFF掩码,其中它们与查找表状态组合以提供每个目的地的拥塞状态。