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    • 1. 发明授权
    • Loop prevention technique for MPLS using two labels
    • 使用两个标签的MPLS环路防护技术
    • US07633859B2
    • 2009-12-15
    • US11046163
    • 2005-01-26
    • Clarence FilsfilsJim GuichardJean-Philippe VasseurStefano B. PrevidiRobert Raszuk
    • Clarence FilsfilsJim GuichardJean-Philippe VasseurStefano B. PrevidiRobert Raszuk
    • H04L12/56
    • H04L45/00H04L45/18H04L45/22H04L45/28H04L45/50H04W12/02
    • A fast reroute (FRR) technique is implemented at the edge of a network. In accordance with the technique, if an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The rerouted packets are designated as being “protected” (i.e., rerouted) data packets before they are forwarded to the backup edge device. To differentiate which data packets are protected and which are not, the backup edge device employs different sets of VPN label values for protected and non-protected network traffic. That is, the backup edge device may allocate two different VPN label values for at least some destination address prefixes that are reachable through the neighboring domain: a first VPN label value for FRR protected traffic and a second VPN label value for non-protected traffic. Upon receiving a data packet containing a protected VPN label value, the backup edge device is not permitted to reroute the packet a second time, e.g., in response to another inter-domain node or link failure, thereby preventing loops from developing at the edge of the network.
    • 在网络边缘实现快速重路由(FRR)技术。 根据该技术,如果边缘设备检测到阻止其与相邻路由域通信的节点或链路故障,则边缘设备将至少一些寻址到该域的数据分组重新路由到备用边缘设备, 将数据包转发到相邻域。 重新路由的数据包在被转发到备份边缘设备之前被指定为“保护”(即重新路由)数据分组。 为了区分哪些数据包受到保护,哪些数据包不受保护,备份边缘设备对受保护和未受保护的网络流量采用不同的VPN标签值集合。 也就是说,备份边缘设备可以为可通过相邻域到达的至少一些目的地地址前缀分配两个不同的VPN标签值:用于FRR保护的业务的第一VPN标签值和用于非保护业务的第二VPN标签值。 在接收到包含受保护的VPN标签值的数据分组时,不允许备份边缘设备第二次重新路由该分组,例如响应于另一个域间节点或链路故障,从而防止循环在 网络。
    • 3. 发明授权
    • Algorithm for backup PE selection
    • 备份PE选择算法
    • US07535828B2
    • 2009-05-19
    • US11084838
    • 2005-03-18
    • Robert RaszukJean-Philippe VasseurClarence FilsfilsJim Guichard
    • Robert RaszukJean-Philippe VasseurClarence FilsfilsJim Guichard
    • G01R31/08H04L12/28
    • H04L45/28H04L45/04H04L45/502
    • A fast reroute (FRR) technique is implemented at the edge of a computer network. If an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The backup edge device is not permitted to reroute the packets a second time. According to the inventive technique, the edge device first identifies a group one or more possible backup edge devices and then selects at least one preferred backup edge device from the group. The edge device makes its selection based on the values of one or more metrics associated with the possible backup edge devices. The metrics are input to a novel selection algorithm that selects the preferred backup edge device(s) using a hierarchical selection process or a weighted-metric selection process, or some combination thereof.
    • 在计算机网络的边缘实现快速重路由(FRR)技术。 如果边缘设备检测到阻止其与相邻路由域通信的节点或链路故障,则边缘设备将至少一些寻址到该域的数据分组重新路由到备份边缘设备,该备份边缘设备又将分组转发到邻居 域。 备份边缘设备不允许再次重新路由数据包。 根据本发明的技术,边缘设备首先识别一个或多个可能的备份边缘设备,然后从组中选择至少一个优选的备份边缘设备。 边缘设备根据与可能的备份边缘设备相关联的一个或多个度量值进行选择。 将度量输入到新颖的选择算法,其使用分层选择过程或加权度量选择过程或其某种组合来选择优选的备份边缘设备。
    • 5. 发明授权
    • Loop prevention technique for MPLS using service labels
    • 使用服务标签的MPLS环路防护技术
    • US07664013B2
    • 2010-02-16
    • US11068081
    • 2005-02-28
    • Clarence FilsfilsDavid D. WardStefano B. PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • Clarence FilsfilsDavid D. WardStefano B. PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • H04L12/26
    • H04L45/18H04L45/04H04L45/22H04L45/28H04L45/50
    • A local fast reroute (FRR) technique is implemented at the edge of a computer network. In accordance with the technique, if an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The rerouted packets are designated as being “protected” (i.e., rerouted) data packets before they are forwarded to the backup edge device. The backup edge device identifies protected data packets as those which contain a predetermined “service” label in their MPLS label stacks. In other words, the service label is used as an identifier for packets that have been FRR rerouted. Upon receiving a data packet containing a service label, the backup edge device is not permitted to reroute the packet a second time, e.g., in response to another inter-domain node or link failure, thereby preventing loops from developing at the edge of the network.
    • 本地快速重路由(FRR)技术在计算机网络的边缘实现。 根据该技术,如果边缘设备检测到阻止其与相邻路由域通信的节点或链路故障,则边缘设备将至少一些寻址到该域的数据分组重新路由到备用边缘设备, 将数据包转发到相邻域。 重新路由的数据包在被转发到备份边缘设备之前被指定为“保护”(即重新路由)数据分组。 备份边缘设备将受保护的数据包标识为在其MPLS标签堆栈中包含预定“服务”标签的数据包。 换句话说,服务标签被用作已被FRR重新路由的数据包的标识符。 在接收到包含服务标签的数据分组时,不允许备份边缘设备第二次重新路由该分组,例如响应于另一个域间节点或链路故障,从而防止在网络边缘发展的环路 。
    • 7. 发明申请
    • Loop prevention technique for MPLS using service labels
    • 使用服务标签的MPLS环路防护技术
    • US20060193248A1
    • 2006-08-31
    • US11068081
    • 2005-02-28
    • Clarence FilsfilsDavid WardStefano PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • Clarence FilsfilsDavid WardStefano PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • H04J3/14H04L12/56H04J1/16H04L12/28
    • H04L45/18H04L45/04H04L45/22H04L45/28H04L45/50
    • A local fast reroute (FRR) technique is implemented at the edge of a computer network. In accordance with the technique, if an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The rerouted packets are designated as being “protected” (i.e., rerouted) data packets before they are forwarded to the backup edge device. The backup edge device identifies protected data packets as those which contain a predetermined “service” label in their MPLS label stacks. In other words, the service label is used as an identifier for packets that have been FRR rerouted. Upon receiving a data packet containing a service label, the backup edge device is not permitted to reroute the packet a second time, e.g., in response to another inter-domain node or link failure, thereby preventing loops from developing at the edge of the network.
    • 本地快速重路由(FRR)技术在计算机网络的边缘实现。 根据该技术,如果边缘设备检测到阻止其与相邻路由域通信的节点或链路故障,则边缘设备将至少一些寻址到该域的数据分组重新路由到备用边缘设备, 将数据包转发到相邻域。 重新路由的数据包在被转发到备份边缘设备之前被指定为“保护”(即重新路由)数据分组。 备份边缘设备将受保护的数据包标识为在其MPLS标签堆栈中包含预定“服务”标签的数据包。 换句话说,服务标签被用作已被FRR重新路由的数据包的标识符。 在接收到包含服务标签的数据分组时,不允许备份边缘设备第二次重新路由该分组,例如响应于另一个域间节点或链路故障,从而防止在网络边缘发展的环路 。