公开(公告)号：US20240195648A1

公开(公告)日：2024-06-13

申请号：US18317895

申请日：2023-05-15

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Sameer R. Gulrajani ,  Ali Sajassi ,  Swadesh Agrawal ,  Nitin Kumar

IPC: H04L12/18 ,  H04L12/46

CPC classification number: H04L12/185 ,  H04L12/4633

Abstract: A system and associated methods provide procedures for establishing multicast connections and forwarding multicast content from a source to a subscriber when an ingress provider edge in communication with the subscriber is connected to an egress provider edge device belonging to an EVPN instance, especially in cases where the egress provider edge device is not receiving content from the source. The system configures “backup” provider edge devices belonging to the EVPN instance to temporarily forward the multicast content to the egress provider edge device on behalf of the source, enabling the ingress provider edge device and subscriber to continue to receive the multicast content from the source while the multicast network adjusts to recognize a new egress provider edge device. Methods of establishing connections between the ingress provider edge device and the correct egress provider edge device are also provided to avoid flooding and inefficient content forwarding throughout the network.

公开(公告)号：US20250141707A1

公开(公告)日：2025-05-01

申请号：US18498830

申请日：2023-10-31

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Lukas Krattiger ,  Sameer R. Gulrajani

IPC: H04L12/18 ,  H04L41/22

Abstract: A method includes generating a visual representation of one or more multicast data trees over a service provider network, each multicast data tree exchanging data between two or more of a plurality of nodes of an entity operating over the service provider network; determining a respective network bandwidth usage over each of the one or more multicast data trees and a network bandwidth waste based on current bandwidth usage of existing data tunnels of one or more multicast data trees and replication distances associated with the plurality of nodes; modifying the one or more multicast data trees based on at least the respective network bandwidth usage over each of the one or more multicast data trees to yield a modification; generating a traffic routing policy to implement the modification; and transmitting a notification to a subset of the plurality of nodes affected by the traffic routing policy.

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：US11418403B2

公开(公告)日：2022-08-16

申请号：US16934731

申请日：2020-07-21

Applicant: Cisco Technology, Inc.

Inventor： Satya Ranjan Mohanty ,  Mrinmoy Ghosh ,  Dhananjaya Rao ,  Sameer R. Gulrajani ,  Mankamana Prasad Mishra

IPC: H04L41/12 ,  H04L12/46 ,  H04L41/14 ,  H04L47/125 ,  H04L45/02

Abstract: A method is performed by a network controller. The method includes receiving information that defines a topology of a network having Ethernet Segments configured with virtual local area networks (VLANs) and including provider edges that are multi-homed to customer edges. The method further comprises, based on the topology, determining for the VLANs particular provider edges among the provider edges that are to operate as designated forwarders of traffic for the VLANs, such that the VLANs are load balanced across the particular provider edges. The method also includes programming the particular provider edges as the designated forwarders of traffic for the VLANs.

公开(公告)号：US20220029890A1

公开(公告)日：2022-01-27

申请号：US16934731

申请日：2020-07-21

Applicant: Cisco Technology, Inc.

Inventor： Satya Ranjan Mohanty ,  Mrinmoy Ghosh ,  Dhananjaya Rao ,  Sameer R. Gulrajani ,  Mankamana Prasad Mishra

IPC: H04L12/24 ,  H04L12/46 ,  H04L12/715 ,  H04L12/803

Abstract: A method is performed by a network controller. The method includes receiving information that defines a topology of a network having Ethernet Segments configured with virtual local area networks (VLANs) and including provider edges that are multi-homed to customer edges. The method further comprises, based on the topology, determining for the VLANs particular provider edges among the provider edges that are to operate as designated forwarders of traffic for the VLANs, such that the VLANs are load balanced across the particular provider edges. The method also includes programming the particular provider edges as the designated forwarders of traffic for the VLANs.

公开(公告)号：US11212221B1

公开(公告)日：2021-12-28

申请号：US16891194

申请日：2020-06-03

Applicant: Cisco Technology, Inc.

Inventor： Swadesh Agrawal ,  Dhananjaya Rao ,  Bertrand Duvivier ,  Sameer R. Gulrajani ,  Yuri Tsier

IPC: H04L12/723 ,  H04L12/46 ,  H04L12/703 ,  H04L12/707

Abstract: First and second egress nodes are each multi-homed to a customer edge (CE) that participates in virtual routing and forwarding (VRF). First forwarding information is configured on the first egress node. The first information includes VRF labels and defines forwarding of traffic based on the VRF labels and a status of a primary path to the CE. The VRF labels include a per-VRF label for the VRF and a per-CE label for the CE. Second forwarding information is configured on the second egress node. The second forwarding information includes the per-VRF label and the per-CE label, and defines traffic forwarding based on the VRF labels. Upon receiving traffic for the CE that carries the per-VRF label, the first egress node determines the status of the primary path, and forwards the traffic to either the CE over the primary path or to the second egress node, depending on the status.

公开(公告)号：US20210385157A1

公开(公告)日：2021-12-09

申请号：US16891194

申请日：2020-06-03

Applicant: Cisco Technology, Inc.

Inventor： Swadesh Agrawal ,  Dhananjaya Rao ,  Bertrand Duvivier ,  Sameer R. Gulrajani ,  Yuri Tsier

IPC: H04L12/723 ,  H04L12/707 ,  H04L12/703 ,  H04L12/46

Abstract: First and second egress nodes are each multi-homed to a customer edge (CE) that participates in virtual routing and forwarding (VRF). First forwarding information is configured on the first egress node. The first information includes VRF labels and defines forwarding of traffic based on the VRF labels and a status of a primary path to the CE. The VRF labels include a per-VRF label for the VRF and a per-CE label for the CE. Second forwarding information is configured on the second egress node. The second forwarding information includes the per-VRF label and the per-CE label, and defines traffic forwarding based on the VRF labels. Upon receiving traffic for the CE that carries the per-VRF label, the first egress node determines the status of the primary path, and forwards the traffic to either the CE over the primary path or to the second egress node, depending on the status.