公开(公告)号：US20190386848A1

公开(公告)日：2019-12-19

申请号：US16557065

申请日：2019-08-30

Applicant: Cisco Technology, Inc.

Inventor： Xiaorong Wang ,  Yicheng Liu ,  Lianxiang Wang ,  Fang Yang ,  Gaofeng Tao ,  Ijsbrand Wijnands

IPC: H04L12/44

Abstract: Methods and network devices are disclosed for multicast traffic steering in a communications network. In one embodiment, a method includes receiving, at a node in a network, a multicast message comprising an incoming message bit array and a tree identifier value. The embodiment further includes selecting a bit indexed forwarding table stored at the node and corresponding to the tree identifier value, accessing within the selected forwarding table an entry corresponding to an intended destination node for the message, and forwarding, to a neighboring node identified in the accessed entry, a copy of the message comprising a forwarded message bit array in place of the incoming message bit array. An embodiment of a network device includes one or more network interfaces and a processor adapted to perform steps of the method.

公开(公告)号：US10432425B2

公开(公告)日：2019-10-01

申请号：US15487626

申请日：2017-04-14

Applicant: Cisco Technology, Inc.

Inventor： Xiaorong Wang ,  Yicheng Liu ,  Lianxiang Wang ,  Fang Yang ,  Gaofeng Tao ,  Ijsbrand Wijnands

IPC: H04L12/753 ,  H04L12/781 ,  H04L12/761 ,  H04L12/44 ,  H04L12/46

Abstract: Methods and network devices are disclosed for internet protocol (IP) based encapsulation in bit indexed explicit replication (BIER) forwarding. In one embodiment, a method includes receiving a multicast message comprising an inner IP header, an intervening header, and an outer IP header. The embodiment further includes accessing a message bit array stored in the intervening header, retrieving an IP address from an entry in a bit indexed forwarding table, replacing an IP destination address in the outer IP header of a copy of the multicast message with the retrieved IP address, and sending the copy of the multicast message toward a second node in the network, where the retrieved IP address is assigned to the second node. An embodiment of a network device includes a processor operably coupled to a plurality of storage locations and to one or more network interfaces and adapted to perform steps of the method.

公开(公告)号：US20180287935A1

公开(公告)日：2018-10-04

申请号：US15487626

申请日：2017-04-14

Applicant: Cisco Technology, Inc.

Inventor： Xiaorong Wang ,  Yicheng Liu ,  Lianxiang Wang ,  Fang Yang ,  Gaofeng Tao ,  Ijsbrand Wijnands

IPC: H04L12/753 ,  H04L12/44 ,  H04L12/761

CPC classification number: H04L12/44 ,  H04L12/4625 ,  H04L12/4633 ,  H04L2212/00

Abstract: Methods and network devices are disclosed for internet protocol (IP) based encapsulation in bit indexed explicit replication (BIER) forwarding. In one embodiment, a method includes receiving a multicast message comprising an inner IP header, an intervening header, and an outer IP header. The embodiment further includes accessing a message bit array stored in the intervening header, retrieving an IP address from an entry in a bit indexed forwarding table, replacing an IP destination address in the outer IP header of a copy of the multicast message with the retrieved IP address, and sending the copy of the multicast message toward a second node in the network, where the retrieved IP address is assigned to the second node. An embodiment of a network device includes a processor operably coupled to a plurality of storage locations and to one or more network interfaces and adapted to perform steps of the method.

公开(公告)号：US20160065455A1

公开(公告)日：2016-03-03

申请号：US14472469

申请日：2014-08-29

Applicant: Cisco Technology, Inc.

Inventor： Alan Xiao-rong Wang ,  Dapeng Liu ,  Yu Zhang ,  Gaofeng Tao

IPC: H04L12/721 ,  H04L12/733 ,  H04L12/715 ,  H04L29/08 ,  H04L12/851 ,  H04L12/859

CPC classification number: H04L45/38 ,  H04L45/04 ,  H04L45/20 ,  H04L47/2441 ,  H04L47/2475

Abstract: Techniques whereby a LAN-side border router observes all packets of an application flow from both directions so that the application recognition performed on the LAN-side border router functions properly. A border router may implement flags in a flow cache to indicate whether the border router is the LAN-side border router and/or a WAN-side border router for an application flow. As packets are received at a border router at either the LAN interface or WAN interface, the flags associated with packet's application flows are examined to determine if the border router is the LAN-side border router for the application flow. If so, then application recognition and routing control may be performed. If not, the packet may be redirected to another border router that may be the LAN-side border router or the WAN-side border router for the application flow to insure that border router observes the packet.

Abstract translation: LAN侧边界路由器从两个方向观察应用流的所有分组的技术，使得在LAN侧边界路由器上执行的应用识别功能正常工作。 边界路由器可以在流缓存中实现标志，以指示边界路由器是否是用于应用流的LAN侧边界路由器和/或WAN侧边界路由器。 当分组在LAN接口或WAN接口处的边界路由器处被接收时，检查与分组的应用流相关联的标志，以确定边界路由器是否是应用流的LAN侧边界路由器。 如果是这样，则可以执行应用识别和路由控制。 如果不是，则该分组可以被重定向到可能是用于该应用流的LAN侧边界路由器或WAN侧边界路由器的另一边界路由器，以确保边界路由器观察该分组。