Patents by Inventor Tarek Saad
Tarek Saad has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11606250Abstract: In general, techniques are described for signaling IP path tunnels for traffic engineering using constraints in an IP network. For example, network devices, e.g., routers, of an IP network may compute an IP path using constraint information and establish the IP path using, for example, Resource Reservation Protocol, to signal the IP path without using MPLS. As one example, the egress router generates a path reservation signaling message that includes an egress IP address that is assigned for use by the routers on the IP path to send traffic of the data flow by encapsulating the traffic with the egress IP address and forwarding toward the egress router. As each router in the IP path receives the path reservation signaling message, the router configures a forwarding state to forward traffic encapsulated with the egress IP address to a next hop along the IP path toward the egress router.Type: GrantFiled: September 30, 2019Date of Patent: March 14, 2023Assignee: Juniper Networks, Inc.Inventors: Tarek Saad, Raveendra Torvi, Vishnu Pavan Beeram
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Patent number: 11451478Abstract: A tactical solution to network congestion is provided by a data forwarding device having (1) a first interface with a first link to a downstream data forwarding device and (2) second interface with a second link to a downstream data forwarding device, and executing a method comprising: (a) configuring the second interface as part of a loop-free alternate (LFA) path to a destination device, wherein the first interface is part of a shortest/preferred path to the destination device; (b) monitoring congestion at the first interface to determine whether or not the congestion exceeds a first threshold; and (c) responsive to a determination that the congestion exceeds the first threshold, forwarding at least some data addressed to the destination device, over the LFA path via the second interface instead of over the shortest/preferred path via the first interface, thereby alleviating congestion at the first interface, and otherwise, responsive to a determination that the congestion does not exceed the first thresholType: GrantFiled: November 22, 2019Date of Patent: September 20, 2022Assignee: Juniper Networks, Inc.Inventors: Raveendra Torvi, Tarek Saad, Jonathan C. Barth, Ronald Bonica, Vishnu Pavan Beeram
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Patent number: 11438259Abstract: Support is provided for flexible algorithms, used by the border gateway protocol (BGP) route selection process, in the context of segment routing (SR) Prefix segment identifiers (SIDS) advertised using BGP.Type: GrantFiled: February 18, 2020Date of Patent: September 6, 2022Assignee: Juniper Networks, Inc.Inventors: Raveendra Torvi, Tarek Saad, Jonathan C Barth, John E. Drake, Vishnu Pavan Beeram
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Patent number: 11411866Abstract: In some implementations, a network device may identify a segment routing traffic engineering (SR-TE) algorithm supported by the network device. The network device may determine, based on identifying the SR-TE algorithm, an identification value associated with the network device. The network device may generate an advertisement packet that includes the identification value and information identifying the SR-TE algorithm. The network device may send the advertisement packet to another network device to cause the other network device to update a data structure to indicate that the network device supports the SR-TE algorithm and that the network device is associated with the identification value. The other network device may determine, using the SR-TE algorithm, a forwarding path for a data packet that indicates the network device as a hop in the forwarding path.Type: GrantFiled: February 1, 2021Date of Patent: August 9, 2022Assignee: Juniper Networks, Inc.Inventors: Jonathan C. Barth, Shraddha Hegde, William Britto Arimboor Joseph, Vishnu Pavan Beeram, Tarek Saad
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Publication number: 20220247673Abstract: In some implementations, a network device may identify a segment routing traffic engineering (SR-TE) algorithm supported by the network device. The network device may determine, based on identifying the SR-TE algorithm, an identification value associated with the network device. The network device may generate an advertisement packet that includes the identification value and information identifying the SR-TE algorithm. The network device may send the advertisement packet to another network device to cause the other network device to update a data structure to indicate that the network device supports the SR-TE algorithm and that the network device is associated with the identification value. The other network device may determine, using the SR-TE algorithm, a forwarding path for a data packet that indicates the network device as a hop in the forwarding path.Type: ApplicationFiled: February 1, 2021Publication date: August 4, 2022Inventors: Jonathan C. BARTH, Shraddha HEGDE, William Britto Arimboor JOSEPH, Vishnu Pavan BEERAM, Tarek SAAD
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Patent number: 11405295Abstract: The present technology is directed to a scalable solution for end-to-end performance delay measurement for Segment Routing Policies on both SR-MPLS and SRv6 data planes. The scalability of the solution stems from the use of distributed PM sessions along SR Policy ECMP paths. This is achieved by dividing the SR policy into smaller sections comprised of SPT trees or sub-paths, each of which is associated with a Root-Node. Downstream SID List TLVs may be used in Probe query messages for signaling SPT information to the Root-Nodes Alternatively, this SPT signaling may be accomplished by using a centralized controller. Root-Nodes are responsible for dynamically creating PM sessions and measuring delay metrics for their associated SPT tree section. The root-nodes then send the delay metrics for their local section to an ingress PE node or to a centralized controller using delay metric TLV field of the response message.Type: GrantFiled: April 20, 2020Date of Patent: August 2, 2022Assignee: CISCO TECHNOLOGY, INC.Inventors: Clarence Filsfils, Rakesh Gandhi, Tarek Saad, Sagar Soni, Patrick Khordoc
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Publication number: 20220210051Abstract: A method, network device, and computer program product for network traffic diversion are disclosed. In one embodiment, a method according to the present disclosure includes receiving a frame at a core edge node that is a member of a redundancy group (where the frame comprises network address information and a packet), and determining whether a link (to which the core edge node is communicatively coupled) is affected by a network failure. The frame was sourced by a remote core edge node that is not a member of the redundancy group, and the network address information indicates that the packet is to be forwarded via the link. In response to the link being affected by the network failure, the method further includes generating a modified frame and forwarding the modified frame to another core edge node. The generating comprises including a redirect label in the modified frame. The another core edge node is another member of the redundancy group.Type: ApplicationFiled: March 21, 2022Publication date: June 30, 2022Inventors: Patrice Brissette, Luc Andre Burdet, Jiri Chaloupka, Mei Zhang, Tarek Saad
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Publication number: 20220182314Abstract: The same prefix segment identifier (SID) may be configured and/or used for either (A) more than one prefix within an interior gateway protocol (IGP) domain, or (B) one prefix with more than one path computation algorithm within the IGP domain by: (a) receiving, by a node in the IGP domain, an IGP advertisement including both (1) a prefix SID and a segment routing global block (SRGB) slice identifier; (b) determining whether or not the SRGB slice identified by the SRGB slice identifier is provisioned on the node; and (c) responsive to a determination that the SRGB slice identified by the SRGB slice identifier is not provisioned on the node, not processing the prefix SID included in the received IGP advertisement, and otherwise responsive to a determination that the SRGB slice identified by the SRGB slice identifier is provisioned on the node, (1) processing the prefix SID and SRGB slice to generate a unique, per SRGB slice, MPLS label for the prefix, and (2) updating a label forwarding information base (LFIB)Type: ApplicationFiled: January 31, 2022Publication date: June 9, 2022Inventors: Abhishek Deshmukh, Raveendra Torvi, Tarek Saad, Vishnu Pavan Beeram
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Publication number: 20220158931Abstract: An example network element includes one or more interfaces and a control unit, the control unit includes one or more processors configured to determine an egress network domain identifier (ID) and determine an abstracted interdomain network topology. The one or more processors are also configured to determine one or more interdomain paths from an abstracted ingress domain node to an abstracted egress domain node and determine whether an abstracted domain node is on the one or more interdomain paths. The one or more processors are configured to, based on the abstracted domain node being on the one or more interdomain paths, include one or more resources within a network domain in a filtered traffic engineering database (TED) and compute a path from an ingress node within the ingress network domain to an egress node within the egress network domain based on the filtered TED.Type: ApplicationFiled: December 20, 2021Publication date: May 19, 2022Inventors: Tarek Saad, Raveendra Torvi, Vishnu Pavan Kumar Beeram, Jonathan C. Barth
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Publication number: 20220141095Abstract: The techniques describe network slicing in computer networks. For example, a node receives a slice policy definition. The slice policy definition comprising a slice selector to identify packets belonging to one or more network slices, referred to as a “slice aggregate,” and one or more network resource requirements for the slice aggregate to meet one or more Service Level Objectives (SLOs). The node configures, based on the slice policy definition, a path for the slice aggregate that complies with the one or more network resource requirements. In response to receiving a packet, the node determines whether the packet is associated with the slice aggregate and, in response to determining that the packet is associated with the slice aggregate, forwards the packet along the path for the slice aggregate.Type: ApplicationFiled: October 29, 2021Publication date: May 5, 2022Inventors: Vishnu Pavan Kumar Beeram, Tarek Saad, Jonathan C. Barth, Chandrasekar Ramachandran, Srihari Ramachandra Sangli
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Patent number: 11316777Abstract: A method, network device, and computer program product for network traffic diversion are disclosed. In one embodiment, a method according to the present disclosure includes receiving a frame at a core edge node that is a member of a redundancy group (where the frame comprises network address information and a packet), and determining whether a link (to which the core edge node is communicatively coupled) is affected by a network failure. The frame was sourced by a remote core edge node that is not a member of the redundancy group, and the network address information indicates that the packet is to be forwarded via the link. In response to the link being affected by the network failure, the method further includes generating a modified frame and forwarding the modified frame to another core edge node. The generating comprises including a redirect label in the modified frame. The another core edge node is another member of the redundancy group.Type: GrantFiled: November 18, 2019Date of Patent: April 26, 2022Assignee: CISCO TECHNOLOGY, INC.Inventors: Patrice Brissette, Luc Andre Burdet, Jiri Chaloupka, Mei Zhang, Tarek Saad
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Publication number: 20220086082Abstract: A disclosed method may include (1) receiving, at a network node within a network, a packet from another network node within the network, (2) identifying, within the packet, a slice label that indicates a network slice that has been logically partitioned on the network, (3) determining a QoS policy that corresponds to the network slice indicated by the slice label, (4) applying the QoS policy to the packet, and then upon applying the QoS policy to the packet, (5) forwarding the packet to an additional network node within the network. Various other apparatuses, systems, and methods are also disclosed.Type: ApplicationFiled: January 15, 2021Publication date: March 17, 2022Inventors: Tarek Saad, Raveendra Torvi, Vishnu Pavan Beeram, Jonathan C. Barth
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Patent number: 11277334Abstract: The same prefix segment identifier (SID) may be configured and/or used for either (A) more than one prefix within an interior gateway protocol (IGP) domain, or (B) one prefix with more than one path computation algorithm within the IGP domain by: (a) receiving, by a node in the IGP domain, an IGP advertisement including both (1) a prefix SID and a segment routing global block (SRGB) slice identifier; (b) determining whether or not the SRGB slice identified by the SRGB slice identifier is provisioned on the node; and (c) responsive to a determination that the SRGB slice identified by the SRGB slice identifier is not provisioned on the node, not processing the prefix SID included in the received IGP advertisement, and otherwise responsive to a determination that the SRGB slice identified by the SRGB slice identifier is provisioned on the node, (1) processing the prefix SID and SRGB slice to generate a unique, per SRGB slice, MPLS label for the prefix, and (2) updating a label forwarding information base (LFIB)Type: GrantFiled: September 30, 2019Date of Patent: March 15, 2022Assignee: Juniper Networks, Inc.Inventors: Abhishek Deshmukh, Raveendra Torvi, Tarek Saad, Vishnu Pavan Beeram
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Patent number: 11252082Abstract: An example network element includes one or more interfaces and a control unit, the control unit includes one or more processors configured to determine an egress network domain identifier (ID) and determine an abstracted interdomain network topology. The one or more processors are also configured to determine one or more interdomain paths from an abstracted ingress domain node to an abstracted egress domain node and determine whether an abstracted domain node is on the one or more interdomain paths. The one or more processors are configured to, based on the abstracted domain node being on the one or more interdomain paths, include one or more resources within a network domain in a filtered traffic engineering database (TED) and compute a path from an ingress node within the ingress network domain to an egress node within the egress network domain based on the filtered TED.Type: GrantFiled: November 13, 2020Date of Patent: February 15, 2022Assignee: Juniper Networks, Inc.Inventors: Tarek Saad, Raveendra Torvi, Vishnu Pavan Beeram, Jonathan C. Barth
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Patent number: 11240142Abstract: Techniques are described for class-based traffic engineering in an IP network. For example, routers of an IP network may establish one or more constrained traffic engineered paths using a link-state protocol (e.g., IGP) without using signaling protocols, such as RSVP or SPRING, or encapsulating packets over MPLS. For example, an egress router of the IP network may receive a capability message specifying the capability of routers to compute a constrained path to the egress router, wherein the capability message comprises path computation information including an identifier of a path computation algorithm to be used by the one or more of the plurality of network devices to reach the egress network device. The egress router may advertise a reachability message including a destination IP prefix and the identifier of the path computation algorithm to cause routers in the IP network to compute the constrained path to reach the egress router.Type: GrantFiled: September 30, 2019Date of Patent: February 1, 2022Assignee: Juniper Networks, Inc.Inventors: Tarek Saad, Raveendra Torvi, Vishnu Pavan Beeram
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Publication number: 20210392014Abstract: A ring node N belonging to a resilient MPLS ring (RMR) provisions and/or configures clockwise (CW) and anti-clockwise (AC) paths on the RMR by: (a) configuring two ring node segment identifiers (Ring-SIDs) on the ring node, wherein a first of the two Ring-SIDs (CW-Ring-SID) is to reach N in a clockwise direction on the ring and a second of the two Ring-SIDs (AC-Ring-SID) is to reach N in an anti-clockwise direction on the ring, and wherein the CW-Ring-SID and AC-Ring-SID are unique within a source packet routing in networking (SPRING) domain including the ring; (b) generating a message including the ring node's CW-Ring-SID and AC-Ring-SID; and (c) advertising the message, via an interior gateway protocol, for receipt by other ring nodes belonging to the ring such that (1) a clockwise multipoint-to-point path (CWP) is defined such that every other one of the ring nodes belonging to the ring can be an ingress for the CWP and such that only the node is an egress for the CWP, and (2) an anti-clockwise multipoint-Type: ApplicationFiled: August 26, 2021Publication date: December 16, 2021Inventors: Raveendra Torvi, Abhishek Deshmukh, Kireeti Kompella, Tarek Saad, Vishnu Pavan Beeram, Ronald Bonica
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Patent number: 11133958Abstract: A ring node N belonging to a resilient MPLS ring (RMR) provisions and/or configures clockwise (CW) and anti-clockwise (AC) paths on the RMR by: (a) configuring two ring node segment identifiers (Ring-SIDs) on the ring node, wherein a first of the two Ring-SIDs (CW-Ring-SID) is to reach N in a clockwise direction on the ring and a second of the two Ring-SIDs (AC-Ring-SID) is to reach N in an anti-clockwise direction on the ring, and wherein the CW-Ring-SID and AC-Ring-SID are unique within a source packet routing in networking (SPRING) domain including the ring; (b) generating a message including the ring node's CW-Ring-SID and AC-Ring-SID; and (c) advertising the message, via an interior gateway protocol, for receipt by other ring nodes belonging to the ring such that (1) a clockwise multipoint-to-point path (CWP) is defined such that every other one of the ring nodes belonging to the ring can be an ingress for the CWP and such that only the node is an egress for the CWP, and (2) an anti-clockwise multipoint-Type: GrantFiled: September 30, 2019Date of Patent: September 28, 2021Assignee: Juniper Networks, Inc.Inventors: Raveendra Torvi, Abhishek Deshmukh, Kireeti Kompella, Tarek Saad, Vishnu Pavan Beeram, Ronald Bonica
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Publication number: 20210297340Abstract: An ingress network device may receive a core domain network segment identifier associated with a core domain network of the multi-domain network. The ingress network device may receive location data of an egress network device associated with a second leaf domain network of the multi-domain network, wherein the location data may include data identifying the core domain network segment identifier, a second leaf domain network segment identifier associated with the second leaf domain network, and an egress network device segment identifier associated with the egress network device. The ingress network device may store the core domain network segment identifier and the location data, and may utilize the core domain segment identifier and the location data to route traffic to the egress network device.Type: ApplicationFiled: March 20, 2020Publication date: September 23, 2021Inventors: Tarek SAAD, Jonathan C. BARTH
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Publication number: 20210258249Abstract: Support is provided for flexible algorithms, used by the border gateway protocol (BGP) route selection process, in the context of segment routing (SR) Prefix segment identifiers (SIDS) advertised using BGP.Type: ApplicationFiled: February 18, 2020Publication date: August 19, 2021Inventors: Raveendra Torvi, Tarek Saad, Jonathan C Barth, John E. Drake, Vishnu Pavan Beeram
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Patent number: 11070463Abstract: At least one bandwidth-guaranteed segment routing (SR) path through a network is determined by: (a) receiving, as input, a bandwidth demand value; (b) obtaining network information; (c) determining a constrained shortest multipath (CSGi); (d) determining a set of SR segment-list(s) (Si=[sl1i, sl2i . . . slni]) a that are needed to steer traffic over CSGi; and (e) tuning the loadshares in Li, using Si and the per segment-list loadshare (Li=[l1i, l2i . . . lni]), the per segment equal cost multipath (“ECMP”), and the per link residual capacity, such that the bandwidth capacity that can be carried over CSGi is maximized.Type: GrantFiled: September 30, 2019Date of Patent: July 20, 2021Assignee: Juniper Networks, Inc.Inventors: Raveendra Torvi, Sudharsana Venkataraman, Tarek Saad, Vishnu Pavan Beeram