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Chaired by: Nick McKeown, Stanford University; Jen Rexford, Princeton University.
Sponsored by: Netronome, Microsoft, Intel, Cisco & Barefoot Networks.
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Wednesday, November 18 • 3:50pm - 4:15pm
In-band Network Monitoring with Programmable Dataplanes​​

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Datacenter networks have evolved over the years in both scale and complexity of the end-to-end topology. Large datacenter networks serving highly volatile workloads are deployed using multi-tier Clos topologies with multiple paths between end-points to scale bandwidth. In addition, virtual L2/L3 topologies with a rich set of L4-L7 services can be built rapidly in seconds to connect physical servers, virtual machines and containers. Traditional network monitoring techniques based on fetching state from individual network elements through the control plane are either too restrictive or too slow to meet the needs of such high-scale networks with virtual and physical layers and advanced network functions.

We present a framework called “In-band Network Telemetry” (INT) that enables collection of end-to-end real-time state directly in the datapath. A source end-point embeds instructions in packets listing the types of network state to be collected from the network elements. Each network element inserts the requested network state in the packet as it traverses the network. P4 provides a natural way to express the kind of packet header parsing and modifications required for INT.

Ability to collect real-time end-to-end network state opens up many new possibilities. We present two main use cases for INT. First, we present the application of INT to network monitoring and troubleshooting. Second, we present novel algorithms that use network state collected at RTT timescales to achieve effective load balancing of traffic across equal-cost paths, translating to better performance for both throughput-heavy and latency-sensitive applications.


Speakers
avatar for Mukesh Hira, VMware

Mukesh Hira, VMware

Mukesh Hira is a Staff Software Engineer in the Networking and Security Business Unit of VMware where he leads some of the NSX data plane projects. He holds a PhD in Electrical Engineering from Stanford University and has over 15 years of experience in design and development of networking software.​
avatar for Naga Katta, Princeton

Naga Katta, Princeton

Naga Katta is a fifth year PhD student at Princeton working under the supervision of Professor Jennifer Rexford. His research focus at Princeton is primarily centered around Software-Defined Networking (SDN). He worked on various research problems related to scalability of SDN-related abstractions using techniques like reachability analysis and rule-caching. He had also worked on improving reliability of SDN controller... Read More →



Wednesday November 18, 2015 3:50pm - 4:15pm
McCaw Hall - Presentations

Attendees (3)