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公开(公告)号：US20060221962A1
公开(公告)日：2006-10-05
申请号：US11099245
申请日：2005-04-05
CPC分类号： H04L12/1836 , H04L12/5692 , H04L45/00 , H04L45/16
摘要： Various systems and methods are disclosed for performing multicast routing over unidirectional links. For example, one method involves maintaining a multicast adjacency state, which is associated with an interface that is coupled to receive messages from a network device via a unidirectional link. The multicast adjacency state identifies a network address of the network device. The method also involves sending a multicast protocol control message to the network device via a bidirectional path. The destination address of the network multicast protocol control message is the network address in the multicast adjacency state.
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公开(公告)号：US20060159092A1
公开(公告)日：2006-07-20
申请号：US11046629
申请日：2005-01-28
申请人： Arjen Boers , Ijsbrand Wijnands
发明人： Arjen Boers , Ijsbrand Wijnands
IPC分类号： H04L12/56
摘要： In the disclosed active multicast information protocol, a first edge router of a network receives a data packet from a source, wherein the data packet comprises data to be sent to receivers of a multicast group. The first edge router may rout the data packet to a first core router within the network. The first edge router also generates a message in response to receiving the data packet. This message is transmitted to the first core router within a network. The message includes an address of the source, but the message lacks data to be transmitted to the receivers of the multicast group. Another edge router stores the first multicast group and source addresses in an entry of a look-up table (LUT) in response to the edge router receiving a first message directly or indirectly from the first edge router.
摘要翻译： 在所公开的主动组播信息协议中，网络的第一边缘路由器从源接收数据分组，其中数据分组包括要发送到多播组的接收者的数据。 第一边缘路由器可以将数据分组路由到网络内的第一核心路由器。 第一边缘路由器还响应于接收到数据分组而产生消息。 该消息被传送到网络内的第一个核心路由器。 该消息包括源的地址，但该消息缺少要发送到组播组的接收者的数据。 响应于边缘路由器直接或间接从第一边缘路由器接收第一消息，另一边缘路由器将第一多播组和源地址存储在查找表（LUT）的条目中。
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公开(公告)号：US09712458B2
公开(公告)日：2017-07-18
申请号：US14684415
申请日：2015-04-12
IPC分类号： H04L12/931
CPC分类号： H04L49/201
摘要： In one embodiment, for each particular multicast flow of a plurality of multicast flows of packets a particular consolidation encoding of a plurality of consolidation encodings is selected based on the sparseness of bit positions within a bit string corresponding to designated receiving packet switching devices of the particular multicast flow. The packet switching device sends one or more packets corresponding to said particular packet, with each of these one or more packets including designated receiving packet switching devices of the particular multicast flow in the header of said particular packet according to the particular consolidation encoding. In one embodiment, different consolidation encodings of the plurality of consolidation encodings are used for at least two different multicast flows of the plurality of multicast flows of packets. In one embodiment, each of said receiving packet switching devices is Bit Index Explicit Replication (BIER) Bit-Forwarding Router (BFR).
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公开(公告)号：US09094224B2
公开(公告)日：2015-07-28
申请号：US13563475
申请日：2012-07-31
申请人： Stefan Olofsson , IJsbrand Wijnands
发明人： Stefan Olofsson , IJsbrand Wijnands
IPC分类号： H04L12/28 , H04L12/18 , H04L12/761 , H04L12/705
CPC分类号： H04L12/1868 , H04L45/16 , H04L45/18
摘要： In one embodiment, a device connected to a network as part of a multicast tree receives a revised unicast routing and distributes the revised unicast routing and a query packet to a downstream device in the multicast tree. The device receives an acknowledgement message from the downstream device based on the query packet and determines a new multicast route based on the revised unicast routing and the acknowledgement message from the downstream device.
摘要翻译： 在一个实施例中，作为多播树的一部分连接到网络的设备接收经修改的单播路由，并将修改的单播路由和查询分组分发到多播树中的下游设备。 该设备基于查询分组从下游设备接收确认消息，并且基于经修改的单播路由和来自下游设备的确认消息确定新的多播路由。
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公开(公告)号：US08879429B2
公开(公告)日：2014-11-04
申请号：US13430230
申请日：2012-03-26
IPC分类号： H04L12/28 , H04L12/56 , H04L12/18 , H04L12/701 , H04L12/761
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。
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公开(公告)号：US20140052831A1
公开(公告)日：2014-02-20
申请号：US13588129
申请日：2012-08-17
IPC分类号： G06F15/177
CPC分类号： H04L61/25 , H04L12/18 , H04L12/185 , H04L12/1854 , H04L45/16 , H04L61/6004
摘要： The present disclosure provides a source specific multicast service that maps multicast group addresses to corresponding source addresses. A boundary routing element can be configured to determine whether a received join request includes a mapped group address. If the join request does not include a mapped group address, boundary routing element can be configured to perform normal join request processing of the join request. If the join request includes a mapped group address, the boundary routing element can be configured to generate a corresponding source address using the mapped group address. The boundary routing element can also be configured to perform alternative join request processing as if the join request were an SSM join request that specified both a source address and a multicast group address.
摘要翻译： 本公开提供了将多播组地址映射到相应源地址的源特定多播服务。 可以配置边界路由元素以确定接收到的加入请求是否包括映射的组地址。 如果加入请求不包括映射组地址，则边界路由元素可以被配置为执行加入请求的正常连接请求处理。 如果加入请求包含映射组地址，则边界路由元素可以配置为使用映射组地址生成相应的源地址。 边界路由元素还可以被配置为执行替代加入请求处理，就像加入请求是指定源地址和多播组地址的SSM加入请求一样。
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公开(公告)号：US08611346B1
公开(公告)日：2013-12-17
申请号：US12818900
申请日：2010-06-18
申请人： IJsbrand Wijnands , Najam Saquib
发明人： IJsbrand Wijnands , Najam Saquib
IPC分类号： H04L12/28
CPC分类号： H04L12/185
摘要： In one embodiment, a device within a first network may learn a plurality of multicast traffic sources, and may join a first source-specific group for a particular group and a second source-specific group for the particular group. Subsequently, the device may receive multicast traffic from within the first network from at least one of the source-specific groups, select which received traffic to transmit down a non-source-specific shared multicast tree of a second network for the particular group, and transmit the selected traffic down the shared multicast tree for the particular group. In one embodiment, a receiver device in the second network may join the non-source-specific shared multicast tree to receive the traffic for the particular group.
摘要翻译： 在一个实施例中，第一网络内的设备可以学习多个多播流量源，并且可以加入用于特定组的特定组的第一源特定组和用于特定组的第二源特定组。 随后，设备可以从源特定组中的至少一个接收来自第一网络内的组播流量，选择哪个接收到用于向特定组的第二网络的非源特定共享多播树进行传输的流量;以及 将所选流量从特定组的共享多播树传输。 在一个实施例中，第二网络中的接收机设备可以加入非源特定共享多播树以接收特定组的业务。
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公开(公告)号：US08391185B2
公开(公告)日：2013-03-05
申请号：US12126424
申请日：2008-05-23
CPC分类号： H04L45/16 , H04L12/18 , H04L12/185 , H04L45/02 , H04L45/50
摘要： A method, system and an apparatus to transport bidir PIM over a multiprotocol label switched network are provided. The method may comprise receiving a multicast packet at a network element, the multicast packet including an upstream label. The method may further comprise identifying, from the upstream label, a Multicast Distribution Tree (MDT) rooted at a rendezvous point. The packet may be forwarded along the MDT towards the RP based on the upstream label. The MDT may be identified from a downstream label and the packet may be forwarded along the MDT away from the RP based on the downstream label.
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公开(公告)号：US08339996B2
公开(公告)日：2012-12-25
申请号：US11253371
申请日：2005-10-19
申请人： Ijsbrand Wijnands , Arjen Boers
发明人： Ijsbrand Wijnands , Arjen Boers
IPC分类号： H04L12/28
摘要： An apparatus and method for emulating a shared or source distribution tree within an MPLS network. In one embodiment of the method, a router receives a multicast data packet. The router transmits the multicast data packet to a first router via a first point-to-point label switched path (LSP). The router replicates the multicast data packet to produce a replicated multicast data packet. Then the router transmits the replicated multicast data packet to a second router via a second point-to-point LSP. The first point-to-point LSP is distinct from the second point-to-point LSP.
摘要翻译： 一种在MPLS网络内仿真共享或源分发树的装置和方法。 在该方法的一个实施例中，路由器接收多播数据分组。 路由器通过第一个点对点标签交换路径（LSP）将组播数据包发送到第一个路由器。 路由器复制组播数据包以产生复制的组播数据包。 然后，路由器经由第二点对点LSP将复制的多播数据分组发送到第二路由器。 第一个点到点的LSP与第二个点到点的LSP不同。
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60.发明授权Transporting multicast over MPLS backbone using virtual interfaces to perform reverse-path forwarding checks 有权使用虚拟接口在MPLS骨干网上传输组播，执行反向路径转发检查公开(公告)号：US08089964B2
公开(公告)日：2012-01-03
申请号：US11204446
申请日：2005-08-16
申请人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
发明人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
IPC分类号： H04L12/56
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。
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