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    Loop prevention technique for MPLS using service labels
    8.
    发明授权
    Loop prevention technique for MPLS using service labels 有权
    使用服务标签的MPLS环路防护技术

    公开(公告)号：US07961600B2

    公开(公告)日：2011-06-14

    申请号：US12694038

    申请日：2010-01-26

    申请人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    发明人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    IPC分类号： H04L12/26

    CPC分类号： H04L45/18 ,  H04L45/04 ,  H04L45/22 ,  H04L45/28 ,  H04L45/50

    摘要： In one embodiment, a loss of communication is detected between a first edge device of a computer network and a neighboring routing domain. A data packet is received at the first edge device, where the received data packet contains a destination address that is reachable via the neighboring routing domain. A determination is made whether a service label is located in a Multi-Protocol Label Switching (MPLS) label stack included in the received data packet. A service label in the MPLS label stack indicates that the received data packet was previously rerouted in accordance with fast reroute (FRR) operations. In response to a determination that the received data packet does not include a service label in the MPLS label stack, the received data packet is rerouted to a second edge device of the computer network for forwarding to the neighboring routing domain.

    摘要翻译： 在一个实施例中，在计算机网络的第一边缘设备和相邻路由域之间检测到通信丢失。 在第一边缘设备处接收数据分组，其中所接收的数据分组包含经由相邻路由域可到达的目的地地址。 确定服务标签是否位于包含在所接收的数据分组中的多协议标签交换（MPLS）标签栈中。 MPLS标签堆栈中的服务标签表示接收到的数据包是根据快速重路由（FRR）操作先前重新路由的。 响应于接收到的数据分组在MPLS标签堆栈中不包括服务标签的确定，所接收的数据分组被重新路由到计算机网络的第二边缘设备以转发到相邻路由域。

    LOOP PREVENTION TECHNIQUE FOR MPLS USING SERVICE LABELS
    9.
    发明申请
    LOOP PREVENTION TECHNIQUE FOR MPLS USING SERVICE LABELS 有权
    使用服务标签的MPLS环路预防技术

    公开(公告)号：US20100118732A1

    公开(公告)日：2010-05-13

    申请号：US12694038

    申请日：2010-01-26

    申请人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    发明人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    IPC分类号： H04L12/26 ,  H04L12/56

    CPC分类号： H04L45/18 ,  H04L45/04 ,  H04L45/22 ,  H04L45/28 ,  H04L45/50

    摘要： In one embodiment, a loss of communication is detected between a first edge device of a computer network and a neighboring routing domain. A data packet is received at the first edge device, where the received data packet contains a destination address that is reachable via the neighboring routing domain. A determination is made whether a service label is located in a Multi-Protocol Label Switching (MPLS) label stack included in the received data packet. A service label in the MPLS label stack indicates that the received data packet was previously rerouted in accordance with fast reroute (FRR) operations. In response to a determination that the received data packet does not include a service label in the MPLS label stack, the received data packet is rerouted to a second edge device of the computer network for forwarding to the neighboring routing domain.

    摘要翻译： 在一个实施例中，在计算机网络的第一边缘设备和相邻路由域之间检测到通信丢失。 在第一边缘设备处接收数据分组，其中所接收的数据分组包含经由相邻路由域可到达的目的地地址。 确定服务标签是否位于包含在所接收的数据分组中的多协议标签交换（MPLS）标签栈中。 MPLS标签堆栈中的服务标签表示接收到的数据包是根据快速重路由（FRR）操作先前重新路由的。 响应于接收到的数据分组在MPLS标签堆栈中不包括服务标签的确定，所接收的数据分组被重新路由到计算机网络的第二边缘设备以转发到相邻路由域。

    Loop prevention technique for MPLS using service labels
    10.
    发明授权
    Loop prevention technique for MPLS using service labels 有权
    使用服务标签的MPLS环路防护技术

    公开(公告)号：US07664013B2

    公开(公告)日：2010-02-16

    申请号：US11068081

    申请日：2005-02-28

    申请人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    发明人： Clarence Filsfils ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    IPC分类号： H04L12/26

    CPC分类号： H04L45/18 ,  H04L45/04 ,  H04L45/22 ,  H04L45/28 ,  H04L45/50

    摘要： 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.

    摘要翻译： 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 。