公开(公告)号：US20180367451A1

公开(公告)日：2018-12-20

申请号：US15625855

申请日：2017-06-16

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Sameer R. Gulrajani ,  Karthik Subramanian ,  Swadesh Agrawal

IPC: H04L12/741 ,  H04L12/761

Abstract: In a network environment using a PIM (Protocol Independent Multicast) multicast routing protocol, an Assert mechanism is implemented wherein a provider-edge (PE) device sends an Assert message on the Default MDT (multicast distribution tree) and causes selection of an Assert winner, wherein any ingress PE not selected as the Assert winner stops forwarding the data packets on the Data MDT; and the Assert winner sends periodic PIM control messages on the Default MDT to maintain the Assert state on all ingress PE routers until canceled or timed out. The Assert message is created in response to MDT Mapping from at least one other ingress PE device. The PIM control messages may contain a special bit extension which forces an RPF (reverse path forwarding) neighbor to keep pointing to the Assert winner until a PIM neighborship-down event is detected. This obviates the need for periodic Assert messaging and/or data packet punting.

公开(公告)号：US10069725B1

公开(公告)日：2018-09-04

申请号：US15387313

申请日：2016-12-21

Applicant: Cisco Technology, Inc.

Inventor： Dheerendra Talur ,  Kannan Varadhan ,  Karthik Subramanian ,  Xiongbin Ma ,  Bharath Vasudevan

IPC: H04L12/723 ,  H04L12/755 ,  H04L12/28 ,  H04L12/741 ,  H04L12/935

Abstract: In one embodiment, a service domain router (SDR) establishes a virtual fabric interface between the SDR and at least one peer SDR in a computer network. When the SDR receives a routing advertisement from the peer SDR, where the routing advertisement provides nexthop (NH) information for one or more network routes, the SDR may add the one or more network routes to a routing information base (RIB) listing the peer SDR as a next-to-nexthop (NNH) for the network routes. A forwarding information base (FIB) on the network device then resolves the NNH for the corresponding network routes to an egress interface of the peer SDR, such that packets received at the SDR and destined along a particular route of the one or more network routes may be forwarded via the egress interface of the peer SDR.