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11. 发明授权

US07142514B2 Bandwidth sharing using emulated weighted fair queuing 有权
公开(公告)号：US07142514B2
公开(公告)日：2006-11-28
申请号：US09808652
申请日：2001-03-15
申请人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
发明人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
IPC分类号： H04L12/26
CPC分类号： H04L47/20 , H04L47/22 , H04L47/36 , H04L47/39 , H04L47/50 , H04L47/527 , H04L47/623
摘要： A method of scheduling queue servicing in a data packet switching environment is provided. The method includes a sequence of cyclical steps. The output queues are scheduled for servicing on a least credit value basis. An output queue is selected from a group of output queues associated with a communications port. The selected output port has at least one Payload Data Unit (PDU) pending transmission and a lowest credit value associated therewith. At least one PDU having a length is transmitted from the selected output queue and the credit value is incremented taking the length of the transmitted PDU into consideration. The transmission of PDUs is divided into transmission periods. Once per transmission period credit values associated with output queues holding PDUs pending transmission are decremented in accordance with transmission apportionments assigned for each output queue. The method emulates weighted fair queue servicing with minimal computation enabling hardware implementation thereof.

12. 发明申请

US20060023640A1 Remote control of a switching node in a stack of switching nodes 有权
标题翻译：交换节点堆叠中的交换节点的远程控制
公开(公告)号：US20060023640A1
公开(公告)日：2006-02-02
申请号：US10901873
申请日：2004-07-29
申请人： Rong-Feng Chang , Mike Twu , Craig Barrack , Allen Yu
发明人： Rong-Feng Chang , Mike Twu , Craig Barrack , Allen Yu
IPC分类号： H04L12/28
CPC分类号： H04L41/0803 , H04L49/555 , H04L49/557 , H04L49/65
摘要： A methods and apparatus for remote management of switching network nodes in a stack via in-band messaging are presented. Switching nodes in the stack default to reserved switching node identifiers and stacking ports default to a blocking state upon startup, restart, and reset. Each command frame received via a blocking state is forwarded to a command engine at each switching node and is acknowledged with the current switching node identifier. Each acknowledgement frame bearing the reserved network node identifier triggers configuration of the acknowledging switching node. Switching nodes and the management processor track interrupt state vectors regarding events. An interrupt acknowledgement process is employed to track raised interrupts. Configuration of switching node is performed via command frames transmitted by the management processor and destined to a command engine associated with the switching node. Services provided by the management processor are requested via control frames destined to the switching node to which the management processor is attached and destined to the management port thereof. The advantages are derived from engineered switching node deployments wherein an appropriate number of management processors, less than the number of switching nodes in the stack, are employed to provide services to corresponding switching nodes in the stack, based on processing, control, and configuration bandwidth requirements. The in-band configuration and control of the switching nodes in the stack reduce deployment, configuration, management, and maintenance overheads.
摘要翻译：提出了一种用于通过带内消息传递来对堆叠中的交换网络节点进行远程管理的方法和装置。堆叠中的交换节点默认为保留的交换节点标识符，堆叠端口在启动，重新启动和重置时默认为阻塞状态。经由阻塞状态接收的每个命令帧被转发到每个交换节点处的命令引擎，并且用当前交换节点标识符进行确认。具有保留网络节点标识符的每个确认帧触发确认交换节点的配置。交换节点和管理处理器跟踪关于事件的中断状态向量。采用中断确认过程来跟踪提升的中断。交换节点的配置通过由管理处理器发送并发往与交换节点相关联的命令引擎的命令帧来执行。由管理处理器提供的服务通过去往管理处理器所连接的转发节点的控制帧被请求并发往其管理端口。优点来源于工程交换节点部署，其中基于处理，控制和配置带宽，采用小于堆叠中的交换节点数量的适当数量的管理处理器来向堆栈中的相应交换节点提供服务要求。堆叠中的交换节点的带内配置和控制可以减少部署，配置，管理和维护开销。

13. 发明授权

US07974272B2 Remote control of a switching node in a stack of switching nodes 有权
标题翻译：交换节点堆叠中的交换节点的远程控制
公开(公告)号：US07974272B2
公开(公告)日：2011-07-05
申请号：US10901873
申请日：2004-07-29
申请人： Rong-Feng Chang , Mike Twu , Craig Barrack , Allen Yu
发明人： Rong-Feng Chang , Mike Twu , Craig Barrack , Allen Yu
IPC分类号： H04Q11/00 , H04L12/56
CPC分类号： H04L41/0803 , H04L49/555 , H04L49/557 , H04L49/65
摘要： A methods and apparatus for remote management of switching network nodes in a stack via in-band messaging are presented. Switching nodes in the stack default to reserved switching node identifiers and stacking ports default to a blocking state upon startup, restart, and reset. Each command frame received via a blocking state is forwarded to a command engine at each switching node and is acknowledged with the current switching node identifier. Each acknowledgement frame bearing the reserved network node identifier triggers configuration of the acknowledging switching node. Switching nodes and the management processor track interrupt state vectors regarding events. An interrupt acknowledgement process is employed to track raised interrupts. Configuration of switching node is performed via command frames transmitted by the management processor and destined to a command engine associated with the switching node. Services provided by the management processor are requested via control frames destined to the switching node to which the management processor is attached and destined to the management port thereof. The advantages are derived from engineered switching node deployments wherein an appropriate number of management processors, less than the number of switching nodes in the stack, are employed to provide services to corresponding switching nodes in the stack, based on processing, control, and configuration bandwidth requirements. The in-band configuration and control of the switching nodes in the stack reduce deployment, configuration, management, and maintenance overheads.
摘要翻译：提出了一种用于通过带内消息传递来对堆叠中的交换网络节点进行远程管理的方法和装置。堆叠中的交换节点默认为保留的交换节点标识符，堆叠端口在启动，重新启动和重置时默认为阻塞状态。经由阻塞状态接收的每个命令帧被转发到每个交换节点处的命令引擎，并且用当前交换节点标识符进行确认。具有保留网络节点标识符的每个确认帧触发确认交换节点的配置。交换节点和管理处理器跟踪关于事件的中断状态向量。采用中断确认过程来跟踪提升的中断。交换节点的配置通过由管理处理器发送并发往与交换节点相关联的命令引擎的命令帧来执行。由管理处理器提供的服务通过去往管理处理器所连接的转发节点的控制帧被请求并发往其管理端口。优点来源于工程交换节点部署，其中基于处理，控制和配置带宽，采用小于堆叠中的交换节点数量的适当数量的管理处理器来向堆栈中的相应交换节点提供服务要求。堆叠中的交换节点的带内配置和控制可以减少部署，配置，管理和维护开销。

14. 发明授权

US06999416B2 Buffer management for support of quality-of-service guarantees and data flow control in data switching 失效
公开(公告)号：US06999416B2
公开(公告)日：2006-02-14
申请号：US09935533
申请日：2001-08-23
申请人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
发明人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
IPC分类号： H04J1/16
CPC分类号： H04L49/9078 , H04L47/20 , H04L47/2441 , H04L47/266 , H04L47/29 , H04L47/32 , H04L49/90 , H04L49/9047 , Y02D50/10
摘要： A method of utilizing shared memory resources in switching Protocol Data Units (PDUs) at a data switching node is presented. The method includes reserving: a temporary memory storage portion for storing PDUs prior to queuing for processing thereof, a Class-of-Service memory storage portion to provide support Quality-of-Service guarantees, a shared memory-pool portion and an input port memory storage portion enabling non-blocking input port flow control. Provisions are made for PDU discard decisions to be delayed until after PDU headers are inspected subsequent to the receipt of each PDU. Provisions are made for well-behaved data flows conveyed via an input port to be protected against blocking from misbehaving data flows conveyed via other input ports of the data switching node. The advantages are derived from a memory management scheme which can be equally applied in a PDU discard and a flow control environment to reduce PDU discard instances at a data network node implementing the memory management scheme while reducing memory storage requirements.

15. 发明授权

US06868095B2 Control channel implementation in a packet switched communications network 有权
标题翻译：分组交换通信网络中的控制信道实现
公开(公告)号：US06868095B2
公开(公告)日：2005-03-15
申请号：US09756570
申请日：2001-01-08
申请人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
发明人： Linghsiao Wang , Craig Barrack , Rong-Feng Chang
IPC分类号： H04L12/413 , H04L12/54 , H04L12/56 , H04L29/06 , H04Q3/52 , H04J3/12
CPC分类号： H04L47/10 , H04L47/13 , H04L47/2433 , H04L47/35 , H04L69/22
摘要： A system and method for implementing a control channel in a packet switched communications network. In a computer network, such as a local area network (LAN) it is known to utilize the Ethernet for distributing communications between stations. The Ethernet employs a standard frame format that includes header frames and, in particular a preamble frame which may be used to provide synchronization information between switching devices or nodes. The preamble frame is not required in a Gigabit Ethernet implementation and the present invention employs a portion of the preamble frame to implement a control channel between switching devices.
摘要翻译：一种用于在分组交换通信网络中实现控制信道的系统和方法。在诸如局域网（LAN）的计算机网络中，已知使用以太网来分配站之间的通信。以太网采用标准帧格式，其包括报头帧，特别是可用于在交换设备或节点之间提供同步信息的前导码帧。在千兆比特以太网实现中不需要前导码帧，并且本发明使用前导帧的一部分来实现交换设备之间的控制信道。

16. 发明授权

US07835265B2 High availability Ethernet backplane architecture 有权
标题翻译：高可用性以太网背板架构
公开(公告)号：US07835265B2
公开(公告)日：2010-11-16
申请号：US10284856
申请日：2002-10-31
申请人： Linghsiao Wang , Rong-Feng Chang , Eric (Changhwa) Lin , James Ching-Shau Yik
发明人： Linghsiao Wang , Rong-Feng Chang , Eric (Changhwa) Lin , James Ching-Shau Yik
IPC分类号： G06F11/00 , H04L12/28
CPC分类号： H04L43/0811 , H04L41/0663 , H04L41/0677 , H04L43/10 , H04L43/103 , H04L49/1523 , H04L49/351 , H04L49/552 , H04L69/40
摘要： A high availability backplane architecture. The backplane system includes redundant node boards operatively communicating with redundant switch fabric boards. Uplink ports of the node boards are logically grouped into trunk ports at one end of the communication link with the switch fabric boards. The node boards and the switch fabric boards routinely perform link integrity checks when operating in a normal mode such that each can independently initiate failover to working ports when a link failure is detected. Link failure is detected either by sending a link heartbeat message after the link has had no traffic for a predetermined interval, or after receiving a predetermined consecutive number of invalid packets. Once the link failure is resolved, operation resumes in normal mode.
摘要翻译：高可用性背板架构。背板系统包括与冗余交换矩阵板操作地通信的冗余节点板。节点板的上行端口在与交换矩阵板的通信链路的一端在逻辑上分组成中继端口。节点板和交换矩阵板在正常模式下运行时，会定期执行链路完整性检查，以便在检测到链路故障时，每个节点单板都能独立地启动到工作端口的故障切换。在链路没有预定间隔的流量之后或在接收到预定的连续数量的无效分组之后，通过发送链路心跳消息来检测链路故障。一旦链路故障解决，操作在正常模式下恢复。

17. 发明授权

US07260066B2 Apparatus for link failure detection on high availability Ethernet backplane 有权
标题翻译：高可用性以太网背板上的链路故障检测装置
公开(公告)号：US07260066B2
公开(公告)日：2007-08-21
申请号：US10326352
申请日：2002-12-20
申请人： Linghsiao Wang , Rong-Feng Chang , Eric Lin , James Ching-Shau Yik
发明人： Linghsiao Wang , Rong-Feng Chang , Eric Lin , James Ching-Shau Yik
IPC分类号： G01R31/08
CPC分类号： H04L41/0663 , H04L41/0677 , H04L43/0811 , H04L43/10 , H04L43/103 , H04L49/1523 , H04L49/351 , H04L49/552 , H04L69/40
摘要： A method for actively detecting link failures on a high availability backplane architecture. The backplane system includes redundant node boards operatively communicating with redundant switch fabric boards. Uplink ports of the node boards are logically grouped into trunk ports at one end of the communication link with the switch fabric boards. A probe packet is sent, and a probing timer is set whenever either a specified number of bad packets are received, or an idle timer expires. If a response to the probe packet is received before the probe timer expires then the link is deemed valid, otherwise the link is presumed to have failed. Preferably, either the node boards or the switch fabric boards are configured to properly handle a probe pack, which preferably has identical source and destination addresses.
摘要翻译：一种在高可用性背板架构上主动检测链路故障的方法。背板系统包括与冗余交换矩阵板操作地通信的冗余节点板。节点板的上行端口在与交换矩阵板的通信链路的一端在逻辑上分组成中继端口。发送探测分组，每当接收到指定数量的不良分组，或者空闲定时器到期时，都会设置探测定时器。如果在探测定时器到期之前接收到对探测分组的响应，则该链路被认为有效，否则链路被认为是失败的。优选地，节点板或交换矩阵板被配置为适当地处理优选具有相同的源和目的地址的探针包。

18. 发明授权

US06954424B2 Credit-based pacing scheme for heterogeneous speed frame forwarding 有权
标题翻译：用于异构速度帧转发的基于信用的起搏方案
公开(公告)号：US06954424B2
公开(公告)日：2005-10-11
申请号：US09794184
申请日：2001-02-26
申请人： Craig I. Barrack , Brian Yang , John Lam , Rong-Feng Chang
发明人： Craig I. Barrack , Brian Yang , John Lam , Rong-Feng Chang
IPC分类号： H04L12/56 , H04J1/16
CPC分类号： H04L47/10 , H04L47/39 , H04L49/25 , H04L49/30 , H04L49/505
摘要： A credit-based pacing scheme for heterogeneous speed frame forwarding. A control logic controls the transmission of data between a source device and a destination device in accordance with a handshaking protocol. Pacing logic paces the transmission of the data from the source device to the destination device to prevent congestion in the switching fabric. A credit scheme is used to arbitrate among multiple pacing modules per device, each forwarding data at a different rate.
摘要翻译：用于异构速度帧转发的基于信用的起搏方案。控制逻辑根据握手协议来控制源设备和目的地设备之间的数据传输。起搏逻辑将数据从源设备传输到目标设备，以防止交换结构中的拥塞。信用方案用于在每个设备的多个起搏模块之间进行仲裁，每个转发数据以不同的速率转发。

19. 发明授权

US5367523A Adaptive rate-based congestion and flow control in packet communications networks 失效
标题翻译：分组通信网络中基于速率的自适应拥塞和流量控制
公开(公告)号：US5367523A
公开(公告)日：1994-11-22
申请号：US112737
申请日：1993-08-26
申请人： Rong-Feng Chang , John E. Drake, Jr. , Levent Gun , Lap T. Huynh
发明人： Rong-Feng Chang , John E. Drake, Jr. , Levent Gun , Lap T. Huynh
IPC分类号： H04L12/56 , H04Q11/04 , H04J3/22
CPC分类号： H04L47/10 , H04Q11/0478 , H04L2012/5616 , H04L2012/5632
摘要： An end-to-end, closed loop flow and congestion control system for packet communications networks exchanges rate request and rate response messages between data senders and receivers to allow the sender to adjust the data rate to avoid congestion and to control the data flow. Requests and responses are piggy-backed on data packets and result in changes in the input data rate in a direction to optimize data throughput. GREEN, YELLOW and RED operating modes are defined to increase data input, reduce data input and reduce data input drastically, respectively. Incremental changes in data input are altered non-linearly to change more quickly when further away from the optimum operating point than when closer to the optimum operating point.
摘要翻译：分组通信网络的端到端闭环流和拥塞控制系统在数据发送者和接收者之间交换速率请求和速率响应消息，以允许发送者调整数据速率以避免拥塞并控制数据流。请求和响应对数据包进行捎带，并导致输入数据速率的变化，以便优化数据吞吐量。绿色，黄色和红色操作模式被定义为分别增加数据输入，减少数据输入和减少数据输入。数据输入的增量变化被非线性地改变，以便在距离最佳工作点更远时比在更接近最佳工作点时更快地改变。

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