公开(公告)号：US20120195312A1

公开(公告)日：2012-08-02

申请号：US13361137

申请日：2012-01-30

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  John S. Meylor

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  John S. Meylor

IPC分类号： H04L12/56

CPC分类号： H04L45/50 ,  H04L12/18 ,  H04L12/1845 ,  H04L45/00 ,  H04L45/04 ,  H04L45/46 ,  H04L45/502 ,  H04L2012/5641 ,  H04L2012/5642 ,  H04L2012/6416

摘要： A method of using a point-to-point (P2P) label switched path (LSP) to transmit multicast data packets partially through a multiprotocol label switched (MPLS) network when one or more label switched routers (LSRs) of the MPLS are not multicast label distribution protocol (mLDP) enabled. The P2P LSP can be used to transmit multicast data packets to the head end of a point-to-multipoint (P2MP) LSP created with mLDP enabled LSRs. The P2MP LSP can be used to transmit the multicast data packets through the MPLS network to intended receivers that are external to the MPLS network. The P2MP LSP can be built from an egress edge LSR towards an ingress edge LSR, by mLDP enabled LSRs. The P2P LSP can be built from a core mLDP enabled LSR to the ingress edge LSR, across a non-mLDP enabled LSR between the core mLDP enabled LSR and the ingress edge LSR.

摘要翻译： 当MPLS的一个或多个标签交换路由器（LSR）不是多播时，使用点对点（P2P）标签交换路径（LSP）部分地通过多协议标签交换（MPLS）网络传输组播数据分组的方法 标签分发协议（mLDP）启用。 P2P LSP可用于将组播数据包发送到使用启用了mLDP的LSR创建的点对多点（P2MP）LSP的头端。 P2MP LSP可以用于通过MPLS网络将组播数据包传输到MPLS网络外部的预期接收者。 P2MP LSP可以从出口边缘LSR到入口边缘LSR，由启用了MLDP的LSR构建。 而P2P LSP可以从核心的mLDP启用LSR到边缘入口LSR建成，横跨非的mLDP核心的mLDP启用LSR和边缘入口LSR之间启用LSR。

公开(公告)号：US20120188909A1

公开(公告)日：2012-07-26

申请号：US13430230

申请日：2012-03-26

申请人： Stefano Previdi ,  Dino Farinacci ,  Ijsbrand Wijnands ,  Arjen Boers

发明人： Stefano Previdi ,  Dino Farinacci ,  Ijsbrand Wijnands ,  Arjen Boers

IPC分类号： H04L12/56 ,  H04L12/44

CPC分类号： H04L45/00 ,  H04L12/185 ,  H04L12/1877 ,  H04L45/16

摘要： Various techniques for exchanging control messages in order to gracefully reroute multicast traffic are disclosed. For example, one method involves sending a join message for a multicast group towards a root of a new multicast tree and forwarding multicast traffic, addressed to the multicast group, on a current multicast tree until an acknowledgment corresponding to the join message is received. The new multicast tree can be identified in response to detection of a topology change within the network. Until the acknowledgment is received, multicast traffic that is received via the new multicast tree can be dropped.

摘要翻译： 公开了用于交换控制消息以便正确地重新路由组播业务的各种技术。 例如，一种方法包括向新的多播树的根发送一个组播组的加入消息，并在当前的多播树上转发寻址到组播组的组播流，直到接收到与加入消息对应的确认。 可以响应于网络内的拓扑变化的检测来识别新的多播树。 在接收到确认之前，可以删除通过新的多播树接收的组播流量。

公开(公告)号：US20120163373A1

公开(公告)日：2012-06-28

申请号：US13339953

申请日：2011-12-29

申请人： Alton Lo ,  Arjen Boers ,  Ijsbrand Wijnands

发明人： Alton Lo ,  Arjen Boers ,  Ijsbrand Wijnands

IPC分类号： H04L12/56 ,  H04L12/66

CPC分类号： H04L12/18 ,  H04L45/00 ,  H04L45/04 ,  H04L45/16 ,  H04L45/50 ,  H04L45/60

摘要： A mechanism is provided in which multicast reverse path forwarding can be performed at a provider network egress edge router wherein core routers of the provider network are not configured to support multicast protocols or point-to-multipoint LSPs. An embodiment of the present invention provides for the creation of virtual interfaces in the egress edge router element during configuration of a multicast connection in response to a subscriber request. A virtual interface will be associated with an upstream ingress edge router element and that ingress edge router element is provided a label associated with the virtual interface. Such a label can then be included in datastream packets transmitted through the provider network and be used by reverse path forward checking at the egress edge router element to ascertain whether the multicast datastream is being received by the correct upstream interface.

摘要翻译： 提供了一种机制，其中可以在提供商网络出口边缘路由器处执行多播反向路径转发，其中提供商网络的核心路由器未配置为支持多播协议或点对多点LSP。 本发明的实施例提供了响应于用户请求在配置多播连接期间在出口边缘路由器元件中创建虚拟接口。 虚拟接口将与上游入口边缘路由器元件相关联，并且入口边缘路由器元件被提供与虚拟接口相关联的标签。 然后可以将这样的标签包括在通过提供商网络传输的数据流包中，并通过出口边缘路由器元件的反向路径前向检查来使用，以确定正确的上行接口是否正在接收多播数据流。

公开(公告)号：US08107473B2

公开(公告)日：2012-01-31

申请号：US11377063

申请日：2006-03-16

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  John S. Meylor

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  John S. Meylor

IPC分类号： H04L12/28 ,  H04L12/56

CPC分类号： H04L45/50 ,  H04L12/18 ,  H04L12/1845 ,  H04L45/00 ,  H04L45/04 ,  H04L45/46 ,  H04L45/502 ,  H04L2012/5641 ,  H04L2012/5642 ,  H04L2012/6416

摘要： A method of using a point-to-point (P2P) label switched path (LSP) to transmit multicast data packets partially through a multiprotocol label switched (MPLS) network when one or more label switched routers (LSRs) of the MPLS are not multicast label distribution protocol (mLDP) enabled. The P2P LSP can be used to transmit multicast data packets to the head end of a point-to-multipoint (P2MP) LSP created with mLDP enabled LSRs. The P2MP LSP can be used to transmit the multicast data packets through the MPLS network to intended receivers that are external to the MPLS network. When configuring the P2MP LSP, an mLDP enabled LSR receives a first message from a non-mLDP enabled MPLS core router in response to sending a label mapping message to the non-mLDP enabled MPLS core router. In response, a directed LDP session is created between the mLDP enabled LSR and an edge LSR in one embodiment in response to receiving the first message from an MPLS enabled core router. The directed LDP session can be used to transmit a label mapping message to an ingress LSR.

摘要翻译： 当MPLS的一个或多个标签交换路由器（LSR）不是多播时，使用点对点（P2P）标签交换路径（LSP）部分地通过多协议标签交换（MPLS）网络传输组播数据分组的方法 标签分发协议（mLDP）启用。 P2P LSP可用于将组播数据包发送到使用启用了mLDP的LSR创建的点对多点（P2MP）LSP的头端。 P2MP LSP可以用于通过MPLS网络将组播数据包传输到MPLS网络外部的预期接收者。 在配置P2MP LSP时，响应向不启用DNDP的MPLS核心路由器发送标签映射消息，启用了MLDP的LSR从非启用了DNDP的MPLS核心路由器收到第一条消息。 作为响应，响应于从启用MPLS的核心路由器接收到第一消息，在一个实施例中，在启用了MLDP的LSR和边缘LSR之间创建了定向LDP会话。 定向LDP会话可用于向入口LSR发送标签映射消息。

公开(公告)号：US07936752B2

公开(公告)日：2011-05-03

申请号：US10208977

申请日：2002-07-31

申请人： Arjen Boers ,  Ijsbrand Wijnands

发明人： Arjen Boers ,  Ijsbrand Wijnands

IPC分类号： H04L12/28

CPC分类号： H04L29/12009 ,  H04L12/185 ,  H04L12/1859 ,  H04L12/1886 ,  H04L29/12018 ,  H04L61/10

摘要： A system and method of generating a channel address. The method includes mapping a first address, obtained from a membership report, to a second address to generate a channel address. A multicast network device (MND) for subscribing one or more hosts on a multicast network to one or more channels is disclosed. The MND includes a memory containing a first address and a SSM mapping engine configured to map the first address to a second address to generate a channel address, identifying a channel, in response to the first address contained in the memory.

摘要翻译： 一种生成频道地址的系统和方法。 该方法包括将从成员资格报告获得的第一地址映射到第二地址以生成频道地址。 公开了一种用于将组播网络上的一个或多个主机订阅到一个或多个信道的组播网络设备（MND）。 MND包括包含第一地址和SSM映射引擎的存储器，其被配置为响应于存储器中包含的第一地址，将第一地址映射到第二地址以生成标识通道的通道地址。

公开(公告)号：US07925778B1

公开(公告)日：2011-04-12

申请号：US10779183

申请日：2004-02-13

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  Yiqun Cai

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  Yiqun Cai

IPC分类号： G06F15/173

CPC分类号： H04L12/185 ,  H04L45/00 ,  H04L45/04 ,  H04L45/16

摘要： A method and apparatus for providing multicast messages across a data communication network, the method comprising receiving a multicast message and adding to the multicast message a vector stack including at least one address of a router to which the multicast message is to be sent. The multicast message and the vector stack are then forwarded. At the first router indicated by the vector stack, the next address to which the multicast message is to be sent is read. This is repeated as necessary until the multicast message is received by the final address in the vector stack. The multicast message is then routed to the address indicated in the original multicast message.

摘要翻译： 一种用于通过数据通信网络提供多播消息的方法和装置，所述方法包括：接收多播消息，并向所述多播消息中添加包括所述多播消息要向其发送的路由器的至少一个地址的向量堆栈。 然后转发组播消息和向量堆栈。 在向量堆栈指示的第一个路由器上，读取要发送多播消息的下一个地址。 这是必要的，直到由向量堆栈中的最终地址接收到多播消息。 然后将多播消息路由到原始多播消息中指示的地址。

公开(公告)号：US20110058567A1

公开(公告)日：2011-03-10

申请号：US12944901

申请日：2010-11-12

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

IPC分类号： H04L12/44 ,  H04L12/56

CPC分类号： H04L12/18 ,  H04L45/02 ,  H04L45/16 ,  H04L45/28 ,  H04L45/48 ,  H04L47/10 ,  H04L47/125

摘要： A mechanism is provided to configure a plurality of transport trees in a transport network, each of which correspond to a native tree (e.g., a bidirectional multicast tree). In embodiments of the present invention, each of the plurality of transport trees has a unique root node so that in the event of a failure of any root node, the transport trees with surviving root nodes can be used to transport traffic from the native tree. The present invention provides for each transport network edge router being independently responsible for selection of a transport tree that the edge router will use to transmit a datastream, while also being capable of receiving packets from any transport tree. Through the use of such configured transport trees along with independent selection of a transport tree, the present invention provides a reduction in the disruption of datastream transmission due to a root node failure.

摘要翻译： 提供了一种机制来配置传输网络中的多个传输树，每个传输树对应于本地树（例如，双向多播树）。 在本发明的实施例中，多个传输树中的每一个具有唯一的根节点，使得在任何根节点发生故障的情况下，具有幸存根节点的传输树可以用于从本地树传输业务。 本发明提供每个传输网络边缘路由器独立负责边缘路由器将用于传输数据流的传输树的选择，同时还能够从任何传输树接收分组。 通过使用这种配置的传输树以及传输树的独立选择，本发明提供了减少由于根节点故障引起的数据流传输的中断。

公开(公告)号：US07835378B2

公开(公告)日：2010-11-16

申请号：US11346411

申请日：2006-02-02

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

IPC分类号： H04L12/44

CPC分类号： H04L12/18 ,  H04L45/02 ,  H04L45/16 ,  H04L45/28 ,  H04L45/48 ,  H04L47/10 ,  H04L47/125

摘要： A mechanism is provided to configure a plurality of transport trees in a transport network, each of which correspond to a native tree (e.g., a bidirectional multicast tree). In embodiments of the present invention, each of the plurality of transport trees has a unique root node so that in the event of a failure of any root node, the transport trees with surviving root nodes can be used to transport traffic from the native tree. The present invention provides for each transport network edge router being independently responsible for selection of a transport tree that the edge router will use to transmit a datastream, while also being capable of receiving packets from any transport tree. Through the use of such configured transport trees along with independent selection of a transport tree, the present invention provides a reduction in the disruption of datastream transmission due to a root node failure. Aspects of the present invention further provide a capacity for root node load balancing by permitting data transmission over any of the configured transport trees on a source-by-source (or edge router-by-edge router) basis.

摘要翻译： 提供了一种机制来配置传输网络中的多个传输树，每个传输树对应于本地树（例如，双向多播树）。 在本发明的实施例中，多个传输树中的每一个具有唯一的根节点，使得在任何根节点发生故障的情况下，具有幸存根节点的传输树可以用于从本地树传输业务。 本发明提供每个传输网络边缘路由器独立负责边缘路由器将用于传输数据流的传输树的选择，同时还能够从任何传输树接收分组。 通过使用这种配置的传输树以及传输树的独立选择，本发明提供了减少由于根节点故障引起的数据流传输的中断。 本发明的方面还通过允许基于源（或边缘路由器 - 边缘路由器）的任何配置的传输树进行数据传输来提供用于根节点负载平衡的能力。

公开(公告)号：US20070217415A1

公开(公告)日：2007-09-20

申请号：US11377064

申请日：2006-03-16

申请人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

发明人： Ijsbrand Wijnands ,  Arjen Boers ,  Alton Lo

IPC分类号： H04L12/56

CPC分类号： H04L45/00 ,  H04L12/18 ,  H04L12/1836 ,  H04L12/185 ,  H04L12/4633 ,  H04L12/66 ,  H04L45/16 ,  H04L45/50 ,  H04L49/201

摘要： Various devices and methods for implementing multicast over a label-switched core network are disclosed. For example, an edge node can include a physical interface, which is not enabled for multicast, that is configured to be coupled to a core network and a packet rewrite module coupled to the physical interface. The packet rewrite module is configured to encapsulate a multicast packet with a label and to send the encapsulated multicast packet to the physical interface. The label identifies a unicast label switched path (LSP) through the core network. The edge node can also include a virtual interface creation configured to create a virtual interface that is enabled for multicast. The packet rewrite module can encapsulate the multicast packet in response to detecting that the multicast packet is being sent via the virtual interface.

摘要翻译： 公开了通过标签交换核心网实现组播的各种设备和方法。 例如，边缘节点可以包括被配置为耦合到核心网络的物理接口，其不被启用多播，以及耦合到物理接口的分组重写模块。 分组重写模块被配置为封装具有标签的多播分组，并将封装的组播分组发送到物理接口。 标签通过核心网标识出单播标签交换路径（LSP）。 边缘节点还可以包括虚拟接口创建，其被配置为创建为多播启用的虚拟接口。 响应于通过虚拟接口发送组播数据包，数据包重写模块可以封装组播数据包。

公开(公告)号：US20070091827A1

公开(公告)日：2007-04-26

申请号：US11258640

申请日：2005-10-26

申请人： Arjen Boers ,  Ijsbrand Wijnands ,  Lorenzo Vicisano

发明人： Arjen Boers ,  Ijsbrand Wijnands ,  Lorenzo Vicisano

IPC分类号： H04L12/28

CPC分类号： H04L45/00 ,  H04L12/185 ,  H04L45/16 ,  H04L45/50

摘要： A mechanism to dynamically map a multicast session to a transport tree to reduce flooding of egress routers on the transport tree is provided. A mechanism to reduce the length of time in which transient flooding can occur while the transport tree is being chosen or configured is also provided. The disclosed dynamic mapping mechanisms avoid interruption of an established multicast session. One mechanism disclosed provides for remapping of a multicast session by cloning an original transport tree with which the multicast session is associated, associating the multicast session with the cloned transport tree, and then reconfiguring the cloned transport tree in accord with edge egress routers that have subscribers to that multicast session.

摘要翻译： 提供了一种将多播会话动态映射到传输树以减少传输树上出口路由器泛洪的机制。 还提供了一种用于减少在选择或配置传输树时可能发生瞬时洪泛的时间长度的机制。 所公开的动态映射机制避免建立的多播会话的中断。 所公开的一种机制提供了通过克隆与多播会话相关联的原始传输树来重新映射多播会话，将多播会话与克隆的传输树相关联，然后根据具有订阅者的边缘出口路由器重新配置克隆的传输树 到该多播会话。