公开(公告)号：US11800422B2

公开(公告)日：2023-10-24

申请号：US17390445

申请日：2021-07-30

Applicant: Cisco Technology, Inc.

Inventor： Arman Rezaee ,  Ali Sajassi ,  Alessandro Erta ,  Elango Ganesan ,  Pradeep Kumar Kathail

IPC: H04B7/185 ,  H04W36/30 ,  H04L45/50

CPC classification number: H04W36/30 ,  H04B7/18521 ,  H04B7/18541 ,  H04L45/50

Abstract: In one embodiment, an earthbound transceiver in a low earth orbit (LEO) satellite network establishes a connection with a first LEO satellite from a first set of LEO satellites. The first set of LEO satellites are distributed across a first plurality of orbits including first neighboring LEO satellites of the first LEO satellite, and the first neighboring LEO satellites have a fixed or semi-fixed position relative to the first LEO satellite. The earthbound transceiver determines first signal strength values associated with the first set of LEO satellites and second signal strength values associated with a second set of LEO satellites. The earthbound transceiver then periodically compares the first signal strength values to the second signal strength values. At an optimal handoff time, the earthbound transceiver initiates the handoff operation from the first LEO satellite to a second LEO satellite from the second set of LEO satellites.

公开(公告)号：US20230090072A1

公开(公告)日：2023-03-23

申请号：US18052254

申请日：2022-11-03

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Ali Sajassi ,  Samir Thoria ,  Krishnaswamy Ananthamurthy ,  Stig Ingvar Venaas

IPC: H04L12/18 ,  H04L12/46 ,  H04L45/16 ,  H04L67/2895

Abstract: In one embodiment, a method is performed. A device may include an interface in communication with a network. The device may determine whether an all-active multi-homed ethernet segment (ES) associated with the interface is enabled. On a condition that an all-active multi-homed ES is enabled, the device may determine an ethernet virtual private network (EVPN) designated forwarder (DF) state of the all-active multi-homed ES. If the all-active multi-homed ES is enabled and has an ethernet virtual private network (EVPN) designated forwarder (DF) state, the device may enter a protocol independent multicast (PIM) designated router (DR) state. If an all-active multi-homed ES is enabled and does not have an EVPN DF state, the device may enter a PIM non-DR state.

公开(公告)号：US11606333B1

公开(公告)日：2023-03-14

申请号：US17686797

申请日：2022-03-04

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Lukas Krattiger ,  Manoj Kumar Pandey

IPC: H04L61/5053 ,  H04L9/40 ,  H04L61/5014 ,  H04L101/622

Abstract: Systems and techniques are provided for synchronizing DHCP snoop information. In some examples, a method can include, performing, by a first PE device from a plurality of PE devices, DHCP snooping of a first plurality of DHCP messages between a DHCP client and a DHCP server, wherein the plurality of PE devices is part of an ethernet segment for multihoming the DHCP client. In some aspects, the method includes determining, based on snooping the first plurality of DHCP messages, an association between an IP address corresponding to the DHCP client and a MAC address corresponding to the DHCP client. In some examples, the method includes sending, by the first PE device to at least one other PE device from the plurality of PE devices, a first route advertisement that includes the association between the IP address corresponding to the DHCP client and the MAC address corresponding to the DHCP client.

公开(公告)号：US20220247599A1

公开(公告)日：2022-08-04

申请号：US17164690

申请日：2021-02-01

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Balaji Pitta Venkatachalapathy ,  Krishnaswamy Muddenahally Ananthamurthy ,  Ali Sajassi ,  Dhananjaya Kasargod Rao

IPC: H04L12/46 ,  H04L12/723 ,  H04L12/721 ,  H04L12/751 ,  H04L12/749 ,  H04L29/12

Abstract: In one embodiment, a method includes receiving, by a route reflector, a subscription request from a first provider edge node in a network and generating a subscription policy for the first provider edge node. The method also includes receiving a first Ethernet Virtual Private Network (EVPN) Type 2 Route from a second provider edge node, assigning a sequence number to the first EVPN Type 2 Route, and communicating the first EVPN Type 2 Route with the sequence number to the first provider edge node. The method further includes receiving a second EVPN Type 2 Route from a third provider edge node, generating an updated sequence number in response to receiving the second EVPN Type 2 Route from the third provider edge node, and communicating the second EVPN Type 2 Route with the updated sequence number to the first provider edge node and the second provider node.

公开(公告)号：US20220225201A1

公开(公告)日：2022-07-14

申请号：US17390445

申请日：2021-07-30

Applicant: Cisco Technology, Inc.

Inventor： Arman Rezaee ,  Ali Sajassi ,  Alessandro Erta ,  Elango Ganesan ,  Pradeep Kumar Kathail

IPC: H04W36/30 ,  H04B7/185

Abstract: In one embodiment, an earthbound transceiver in a low earth orbit (LEO) satellite network establishes a connection with a first LEO satellite from a first set of LEO satellites. The first set of LEO satellites are distributed across a first plurality of orbits including first neighboring LEO satellites of the first LEO satellite, and the first neighboring LEO satellites have a fixed or semi-fixed position relative to the first LEO satellite. The earthbound transceiver determines first signal strength values associated with the first set of LEO satellites and second signal strength values associated with a second set of LEO satellites. The earthbound transceiver then periodically compares the first signal strength values to the second signal strength values. At an optimal handoff time, the earthbound transceiver initiates the handoff operation from the first LEO satellite to a second LEO satellite from the second set of LEO satellites.

公开(公告)号：US20220116308A1

公开(公告)日：2022-04-14

申请号：US17361510

申请日：2021-06-29

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Ijsbrand Wijnands ,  Anuj Budhiraja ,  Ali Sajassi ,  Stephane Litkowski ,  Satya Ranjan Mohanty

IPC: H04L12/761 ,  H04L12/18 ,  H04L12/751 ,  H04L12/713 ,  H04L12/46

Abstract: A method comprises, at a first router configured to perform Bit Index Explicit Replication (BIER) for forwarding of multicast packets in a network, storing configuration information that indicates that the first router belongs to multiple subdomains of a BIER domain, and is able to forward the multicast packets for a virtual private network on the multiple subdomains. The method further comprises, during an auto-discovery procedure, generating an auto-discovery message to include an auto-discovery route and route attributes that indicate the multiple subdomains, and sending the auto-discovery message to a second router of the virtual private network the network.

公开(公告)号：US20210014147A1

公开(公告)日：2021-01-14

申请号：US17039142

申请日：2020-09-30

Applicant: Cisco Technology, Inc.

Inventor： Patrice Brissette ,  Ali Sajassi ,  Mei Zhang ,  Luc Andre Burdet

IPC: H04L12/751 ,  H04L12/825 ,  H04L12/741 ,  H04L12/723 ,  H04L12/18 ,  H04L12/24 ,  H04L12/703 ,  H04L12/761 ,  H04L12/46 ,  H04L12/721 ,  H04L12/66 ,  H04L12/705 ,  H04L12/803 ,  H04L12/931 ,  H04L12/911 ,  H04L12/927 ,  H04L12/801 ,  H04L29/06 ,  H04L29/14 ,  H04L29/08

Abstract: In one embodiment, a method according to the present disclosure includes receiving a topology change advertisement at a remote core edge node and performing a network address information removal operation. The topology change advertisement is received from a core edge node that is in communication with an access network. The topology change advertisement indicates that a topology change has occurred in the access network. The network address information removal operation removes network address information stored by the remote core edge node. The network address information is used by the remote core edge node in participating in communications with the core edge node.

公开(公告)号：US20200236444A1

公开(公告)日：2020-07-23

申请号：US16843297

申请日：2020-04-08

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Tapraj Singh ,  Mankamana Prasad Mishra

IPC: H04N21/6405 ,  H04L12/46 ,  H04L29/06 ,  H04N21/24 ,  H04N21/222

Abstract: A method is performed by a first provider edge (PE) of a redundancy group including provider edges configured with an Ethernet virtual private network (EVPN) segment identifier (EVI) and an Ethernet segment identifier (ESI) and that are multi-homed to a customer edge (CE). The method includes, upon receiving from the CE a join request including a group address for a multicast stream, electing a designated forwarder (DF) for the multicast stream. The electing includes: computing for each PE a respective affinity for the DF as a function of a respective address of the PE, the EVI, and the group address; and determining which PE has a largest affinity. The method further includes, if the first PE has the largest affinity or does not have the largest affinity, configuring the first PE as the designated forwarder or not configuring the first PE as the designated forwarder for the multicast stream, respectively.

公开(公告)号：US10666459B1

公开(公告)日：2020-05-26

申请号：US15642126

申请日：2017-07-05

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Ali Sajassi

IPC: H04L12/46 ,  H04L12/721 ,  H04L12/723

Abstract: A method is provided in one example embodiment and may include receiving a frame at a Ethernet Virtual Private Network (EVPN) provider edge (PE) node via an attachment circuit link, wherein the frame is to be forwarded to a Virtual Private Local Area Network (LAN) Service (VPLS) PE node; determining whether the EVPN PE node is a designated forwarder for the attachment circuit link; forwarding the frame using at least one primary pseudowire label based on a determination that the EVPN PE node is the designated forwarder for the attachment circuit link; and forwarding the frame using at least one mirrored pseudowire label based on a determination that the EVPN PE node is not the designated forwarder for the attachment circuit link. The EVPN node can be in an all-active multi-homed configuration with at least one other EVPN PE node for a customer edge device.

公开(公告)号：US20190356581A1

公开(公告)日：2019-11-21

申请号：US16531211

申请日：2019-08-05

Applicant: Cisco Technology, Inc.

Inventor： Patrice Brissette ,  Ali Sajassi

IPC: H04L12/703 ,  H04L12/46 ,  H04L12/413 ,  H04L12/707 ,  H04L12/715

Abstract: In one embodiment, a method includes, subsequent to receipt of a packet from a first customer network node destined for a second customer network node at a first provider network node, determining whether a local connection exists between the first provider network node and the second customer network node, the provider network node forming part of an Ethernet Virtual Private Network (“EVPN”)-Virtual Private Wire Service (“VPWS”) domain; if a local connection is determined to exist between the first provider network node and the second customer network node, determining whether the local connection has failed; if the local connection is determined not to have failed, switching the packet to the second customer network node via the local connection instead of via the EVPN-VPWS domain; and if the local connection is determined to have failed, switching the packet to the second customer network node via the EVPN-VPWS domain.