Hewlett Packard Enterprise Development LP

Saurabh Mohan

Venkatavaradhan Devarajan

Alexander Nelson

Vijeesh Erankotte Panayamthatta

Nittin Aggarwal

Goldy Tomy

Joshua Prince

Luis A Mora

Nisarg Rajesh Shah

Jeffrey Mcmenomey

In certain implementations, a method includes receiving, at an ingress interface, a network traffic flow comprising a plurality of network data units; providing the plurality of network data units to a switching component; transmitting the plurality of network data units from the switching component to a hardware offload component prior to determining an egress interface for the plurality of network data units; processing, by the hardware offload component, the plurality of network data units to generate a flow report corresponding to the network traffic flow; transmitting the flow report from the hardware offload component to a control plane; processing, in the control plane, the flow report to determine an egress interface associated with the network traffic flow; updating the flow report to include the egress interface to obtain an updated flow report; and transmitting the updated flow report to a remote collector.

Flow-to-queue telemetry augmentation

A system for efficiently determining a set of next-hop switches from a switch is provided. During operation, the system can determine the plurality of next-hop switches for an Internet Protocol (IP) address prefix. The system can then store, in an entry of a forwarding data structure of the switch, a list of identifying information indicating the plurality of next-hop switches corresponding to the IP address prefix. The identifying information for the plurality of next-hop switches can be stored in the list in an order of preference for forwarding traffic matching the IP address prefix. Upon receiving a packet with a destination IP address matching the IP address prefix, the system can select the entry from the forwarding data structure for determining a next-hop switch for forwarding the packet. The system can then determine the next-hop switch for the packet from the entry based on the order of preference.

Facilitating fast re-route in high-availability networks

A system for layer-2 path tracing is provided. During operation, the system can send, from an originating device, a layer-2 trace packet with a packet type in a layer-2 header of the layer-2 trace packet. The packet type can indicate the trace packet to be a tracing packet. The system can then receive a layer-2 response packet from a respective participating device, which supports layer-2 path tracing, on a path to a target device of the trace packet. Subsequently, the system can obtain, from a payload of the response packet, trace information of a forward path to the participating device traversed by the trace packet and a reverse path from the participating device traversed by the response packet. The trace information can identify one or more layer-2 devices along the forward and reverse paths, and include one or more layer-2 identifiers corresponding to the identified one or more layer-2 devices.

Layer-2 path tracing

A first ingress interface on a switch receives a first control packet for establishing a Transmission Control Protocol (TCP) session and selects a first engine running on a first line card in the switch. A second ingress interface receives a second control packet and selects the same first engine. Data associated with the TCP session received by the first or second ingress interface subsequent to establishing the TCP session is to be forwarded to the first engine. The first ingress interface receives a third control packet and sends, to the selected first engine, a notification indicating the TCP session which is to be tracked. The first or second ingress interface receives a fourth packet with a payload associated with the TCP session and forwards, to the selected first engine, a copy of the fourth packet, thereby facilitating a plurality of engine instances to support application identification.

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Folsom, CA, United States of America

Saurabh Mohan