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1. 发明授权

US08437272B2 Distinguishing between connectivity verification availability and forwarding protocol functionality in a computer network 有权
标题翻译：区分计算机网络中的连接性验证可用性和转发协议功能
公开(公告)号：US08437272B2
公开(公告)日：2013-05-07
申请号：US11839882
申请日：2007-08-16
申请人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , Jonathan Parker , David D. Ward
发明人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , Jonathan Parker , David D. Ward
IPC分类号： H04L12/28 , H04B3/20 , G06F15/16
CPC分类号： H04L41/0695 , H04L69/16
摘要： In one embodiment, a local network device may determine an inability to establish a connectivity verification protocol (e.g., Bidirectional Forwarding Detection, “BFD”) session to a remote network device, such as from unreturned control messages. In response, the local network device may send at least one connectivity verification protocol echo message to the remote network device destined to be returned to the local network device and forwarded using a forwarding protocol. In response to receiving or not receiving the echo message, the local network device may thus determine whether the forwarding protocol is functioning between the local and remote network devices. In this manner, the local network device may determine whether an inability to establish a connectivity verification protocol session is due to an inability to forward packets between the devices, or due to the connectivity verification protocol not working (or not being configured) on the remote network device.
摘要翻译：在一个实施例中，本地网络设备可以确定无法建立到远程网络设备的连接验证协议（例如，双向转发检测，“BFD”）会话，例如来自未返回的控制消息。作为响应，本地网络设备可以向远程网络设备发送至少一个连接性验证协议回发消息，该远程网络设备将返回给本地网络设备并使用转发协议进行转发。响应于接收或不接收到回波消息，本地网络设备因此可以确定转发协议是否在本地和远程网络设备之间运行。以这种方式，本地网络设备可以确定是否不能建立连接性验证协议会话是由于不能在设备之间转发分组，或者由于连接验证协议不在远程（或未被配置）上工作网络设备。

2. 发明申请

US20090046723A1 DISTINGUISHING BETWEEN CONNECTIVITY VERIFICATION AVAILABILITY AND FORWARDING PROTOCOL FUNCTIONALITY IN A COMPUTER NETWORK 有权
标题翻译：连接验证可用性和计算机网络中的前向协议功能之间的差异
公开(公告)号：US20090046723A1
公开(公告)日：2009-02-19
申请号：US11839882
申请日：2007-08-16
申请人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , Jonathan Parker , David D. Ward
发明人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , Jonathan Parker , David D. Ward
IPC分类号： H04L12/56
CPC分类号： H04L41/0695 , H04L69/16
摘要： In one embodiment, a local network device may determine an inability to establish a connectivity verification protocol (e.g., Bidirectional Forwarding Detection, “BFD”) session to a remote network device, such as from unreturned control messages. In response, the local network device may send at least one connectivity verification protocol echo message to the remote network device destined to be returned to the local network device and forwarded using a forwarding protocol. In response to receiving or not receiving the echo message, the local network device may thus determine whether the forwarding protocol is functioning between the local and remote network devices. In this manner, the local network device may determine whether an inability to establish a connectivity verification protocol session is due to an inability to forward packets between the devices, or due to the connectivity verification protocol not working (or not being configured) on the remote network device.
摘要翻译：在一个实施例中，本地网络设备可以确定无法建立到远程网络设备的连接验证协议（例如，双向转发检测，“BFD”）会话，例如来自未返回的控制消息。作为响应，本地网络设备可以向远程网络设备发送至少一个连接性验证协议回发消息，该远程网络设备将返回给本地网络设备并使用转发协议进行转发。响应于接收或不接收到回波消息，本地网络设备因此可以确定转发协议是否在本地和远程网络设备之间运行。以这种方式，本地网络设备可以确定无法建立连接性验证协议会话是由于不能在设备之间转发分组，或者由于连接验证协议在远程服务器上不工作（或未被配置））网络设备。

3. 发明授权

US08543718B2 Technique for efficiently and dynamically maintaining bidirectional forwarding detection on a bundle of links 有权
标题翻译：用于在一组链路上有效和动态地维护双向转发检测的技术
公开(公告)号：US08543718B2
公开(公告)日：2013-09-24
申请号：US11366732
申请日：2006-03-02
申请人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , David D. Ward , Neil R. Ketley
发明人： Reshad A. Rahman , David P. Toscano , Sylvain Masse , David D. Ward , Neil R. Ketley
IPC分类号： G06F15/16 , G06F15/173
CPC分类号： H04L43/10 , H04L41/0663 , H04L45/00 , H04L45/22 , H04L45/24 , H04L45/245 , H04L45/28 , H04L45/58 , H04L45/60 , H04Q2011/0081 , H04Q2213/13162 , Y02D50/30
摘要： A technique efficiently and dynamically maintains bidirectional forwarding detection (BFD) on a bundle of links in a computer network. According to the novel technique, one or more “standby” BFD sessions may be established on one or more corresponding line cards (LCs), the LCs having one or more links of the bundle (bundle links). Once established, one of the standby BFD sessions may be selected as an “active” BFD session based on activity of one of the bundle links of the corresponding LC. Also, BFD messages may be transmitted from one of the bundle links of the active BFD session, e.g., the link receiving BFD messages. In response to inactivity of the transmitting link (e.g., failure, removal, etc.), the active BFD session may switch to another available active bundle link, and if no other active bundle links are available to the active BFD session, one of the standby BFD sessions is selected as the new active BFD session. In the event no other standby BFD sessions exist, the link bundle is determined to have failed.
摘要翻译：一种技术在计算机网络中的一组链路上有效且动态地维护双向转发检测（BFD）。根据该新技术，可以在一个或多个对应的线路卡（LC）上建立一个或多个“待机”BFD会话，该LC具有一束或多个链路的链路（束链路）。一旦建立，其中一个备用BFD会话可以基于对应LC的一个束链路的活动被选为“活动”BFD会话。此外，可以从活动BFD会话的捆绑链路之一（例如，接收BFD消息的链路）发送BFD消息。响应发送链路的不活动（例如，故障，删除等），活动BFD会话可能切换到另一个可用的主动捆绑链路，如果活动BFD会话没有其他活动捆绑链路可用，则其中一个选择备用BFD会话作为新的活动BFD会话。在没有其他备用BFD会话存在的情况下，链路束被确定为失败。

4. 发明授权

US08717899B2 System and method for reporting out-of-resources (OOR) conditions in a data network 有权
标题翻译：在数据网络中报告资源不足（OOR）条件的系统和方法
公开(公告)号：US08717899B2
公开(公告)日：2014-05-06
申请号：US10964184
申请日：2004-10-13
申请人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , Stefano B. Previdi , Jean-Philippe Vasseur , Rodolphe Figaro , Reshad A. Rahman
发明人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , Stefano B. Previdi , Jean-Philippe Vasseur , Rodolphe Figaro , Reshad A. Rahman
IPC分类号： H04L12/26 , H04L12/56
CPC分类号： H04L47/125 , H04L41/06 , H04L45/00 , H04L45/50 , H04L47/2408 , H04L47/745
摘要： A system and method for advertising out-of-resources (OOR) conditions for entities, such as nodes, line cards and data links, in a manner that does not involve using a maximum cost to indicate the entity is “out-of-resources.” According to the technique, an OOR condition for an entity is advertised in one or more type-length-value (TLV) objects contained in an advertisement message. The advertisement message is flooded to nodes on a data network to inform them of the entity's OOR condition. Head-end nodes that process the advertisement message may use information contained in the TLV object to determine a path for a new label switched path (LSP) that does not include the entity associated with the OOR condition.
摘要翻译：用于以不涉及使用最大成本来指示实体的方式向诸如节点，线路卡和数据链路的实体（例如节点，线路卡和数据链路）广告外部资源（OOR）条件的系统和方法是“超出资源。“根据该技术，实体的OOR条件在广告消息中包含的一个或多个类型长度值（TLV）对象中通告。广告消息被洪泛到数据网络上的节点，以通知他们实体的OOR条件。处理广告消息的头端节点可以使用包含在TLV对象中的信息来确定不包括与OOR条件相关联的实体的新标签交换路径（LSP）的路径。

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