Category Archives: Uncategorized

kernel of truth podcast

Navigating the open network operating systems space



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

Some of your favorites are back together on this episode of the Kernel of Truth podcast— specifically Roopa Prabhu, Brian O’Sullivan and Pete Lumbis. Things have changed a little around here since the last time the three of them were chatting together on the podcast but one thing hasn’t, how much they love to talk all things open networking. In this episode the group talks about how to navigate the open networking operating systems space. From figuring out how to choose an open network operating system, to understanding what works best for deployments, and even what resources and communities are out there for you to tap into. We have it all here for you to help you get started. All you have to do is sit back and enjoy the episode and don’t forget to also check out the links below with resources referenced in the podcast. 

Guest Bios

Roopa Prabhu: Roopa is a Linux Architect at NVIDIA, formally Cumulus Networks. She and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Brian O’Sullivan: Brian is in Ethernet Product Management at NVIDIA following its acquisition of Cumulus Networks. For almost 2 decades he’s held software product management positions throughout the industry. When not working, Brian is a voracious reader and previously held a variety of jobs, including bartending in three countries and working as an extra in a German soap opera. You can find him on Twitter at @bosullivan00

Pete Lumbis: CCIE R&S #28677 and CCDE 2012::3, Pete is the director of ethernet technical marketing and docs at NVIDIA. He helps customers build and design next generation, fully automated data centers. He can be found on Twitter at @PeteCCDE.

Show links

Cumulus Linux: https://cumulusnetworks.com/products/cumulus-linux/

SONIC: https://azure.github.io/SONiC

DANOS: https://www.danosproject.org/ 

Mellanox Spectrum Linux switch: https://www.mellanox.com/products/software/linux-switch

ONL: http://opennetlinux.org/

DENT Linux Foundation: https://www.linuxfoundation.org/press-release/2019/12/dent-launches-to-simplify-enterprise-edge-networking-software/

ONLP: https://opencomputeproject.github.io/OpenNetworkLinux/onlp/

Mellanox GitHub: https://github.com/Mellanox/mlxsw/wiki


kernel of truth podcast

The evolution of hardware telemetry and its software interfaces



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

In this episode, Kernel of Truth host Roopa Prabhu is joined by Barak Gafni. The two of them chat about the evolution of hardware telemetry and its software interfaces as well as catch up some of the work on IOAM Barak’s been involved with. We hope you enjoy this episode and don’t forget to also check out the links below with resources referenced in the podcast. 

Guest Bios

Roopa Prabhu: Roopa is a Linux Architect at NVIDIA, formally Cumulus Networks. She and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Barak Gafni: Barak is a Staff Architect at NVIDIA, formally Mellanox Technologies, focusing on enabling the most scalable, agile and simple networks of tomorrow. He joined Mellanox at 2009, and has 12 years of experience in the networking industry. Barak holds a B.Sc. in EE from the University of Tel Aviv (Cum Laude), has co-authored multiple IETF RFCs and holds several patents in the space of networking.

Show links

sFlow and WJH

https://blog.sflow.com/2020/07/visibility-into-dropped-packets.html

IETF

https://tools.ietf.org/html/rfc791

https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-10

OCP 2020 Session: Advances Ethernet Telemtry Working Across NOS’s and Switches


kernel of truth podcast

Cumulus Linux in action at Cloudscale



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

If you’ve listened to the podcast before you may have heard us reference our customers from time to time. In this episode we’re switching things up and instead of referencing a customer, you’re going to hear directly from one! Manuel Schweizer, CEO of Cloudscale, joins host Roopa Prabhu, Attilla de Groot and Mark Horsfield to chat about Cloudscale’s first hand experience with open networking and what they hope the near and distant future of open networking will look like.

Guest Bios

Roopa Prabhu: Roopa Prabhu is a Linux Architect at Cumulus Networks, now NVIDIA. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Attilla de Groot: Attilla has spent the last 15 years at the cutting edge of networking, having spent time with KPN, Amsterdam Internet Exchange, and HP, with exposure to technology from Cisco, HP, Juniper, and Huawei. He now works for NVIDIA networking, formally Cumulus Networks, the creators of open networking, where he is able to continue his interest in open architecture design and automation. You can find him on Twitter at @packet_ninja.

Manuel Schweizer: For more than 10 years, Manuel has been working as a Network Engineer at various companies. Seeing demand for a self-service IaaS platform based on open-source technology that is entirely based in Switzerland, he basically founded cloudscale.ch “by accident”. He can be found on Twitter at @geitguet. 

Mark Horsfield: Mark is a member of the technical support team at Cumulus Networks, now NVIDIA. Behind the scenes our support team is body slamming packets so you don’t have to.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

To learn more about our acquisition by NVIDIA, view our resource hub here.


Open networking post Nvidia-Mellanox-Cumulus acquisition



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

With the recent acquisition of Cumulus Networks by Nvidia, what does that mean for open networking? Kernel of Truth host Roopa Prabhu is joined by Partho Mishra and Amit Katz to discuss what does the acquisition mean for the future of accelerated data center and for open networking in the data center. This is a must listen episode! 

Guest Bios

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Amit Katz: Amit is Vice President Ethernet Switch at Mellanox, Nvidia Business Unit. Amit served as Senior Director of Worldwide Ethernet Switch Sales since 2014, and previously served in various Product Management roles at Mellanox since 2011. Prior to that, Mr. Katz held various Product Management positions at Voltaire and at RAD Data Communications. Mr. Katz graduated from the Academic College of Tel Aviv-Yaffo with a BA of Computer Science and MBA from Bar Ilan University. You can read more of his blogs here

Partho Mishra: Partho is our President & Chief Product Officer at Cumulus Networks. Prior to joining Cumulus, Partho had 25 years of experience in product definition, engineering development and technology evangelization in data science/analytics, wireless and networking. Most recently he was running the RASA Network Analytics team at Aruba where he lead as CEO and then VP after RASA was acquired by Aruba in 2016. At RASA analytics, Partho’s team was in charge of developing a product that used ML/AI techniques to analyze data collected from network infrastructure to help Aruba customers with optimizing their wireless network and improving user experience. You can watch his recent session on “Common Campus Designs” at OCP Summit here

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

To read the announcement, head to the NVIDIA blog here.


kernel of truth podcast

Building modern campus networks



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

In this episode we talk about trends, architectures and technologies for building modern Campus networks. Joining Kernel of Truth podcast hosts Brian O’Sullivan and Roopa Prabhu are two of our senior consultants, Eric Pulvino and David Marshall, who know what they’re talking about because they are in the field working with customers building these networks. They share their first hand knowledge here so be sure to take a listen!

Guest Bios

Brian O’Sullivan: Brian currently heads Product Management for Cumulus Linux. For 15 or so years he’s held software Product Management positions at Juniper Networks as well as other smaller companies. Once he saw the change that was happening in the networking space, he decided to join Cumulus Networks to be a part of the open networking innovation. When not working, Brian is a voracious reader and has held a variety of jobs, including bartending in three countries and working as an extra in a German soap opera. You can find him on Twitter at @bosullivan00.

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Eric Pulvino: Eric is a Senior Consulting Engineer on our Professional Services team. Before he became Cumulus Curious(TM) he worked for Cisco consulting on large service provider networks from various household names. Today he works with customers in all stages of the open networking pipeline from initial product training, on to architecture and design, as well as the deployment and operation phases. He is not sure if he loves Linux or Networking more but is happy to work at Cumulus Networks where he doesn’t have to choose. When not on-the-clock, he is frequently annoying his family, writing all kinds of python-based home automation. You can find him on Twitter at @EricPulvino.

David Marshall: David is a Senior Consulting Engineer at Cumulus Networks. He consults with customers on how to scale out complex designs and automation schemes for large scale in-house data center deployments.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

To learn about our Campus solution, head to our solutions page here.


kernel of truth podcast

Routing protocols in the datacenter fabric



Subscribe to Kernel of Truth on iTunesGoogle PlaySpotifyCast Box and Sticher!

Click here for our previous episode.

Hosts Roopa Prabhu and Pete Lumbis are joined by a special guest to the podcast, Russ White! The group come together virtually to discuss what we should think about when it comes to routing protocols in the datcenter. What are the tradeoffs when using traditional protocols like OSPF or BGP? What about new protocols like RIFT or a hybrid approach with things like BGP-link state? Spoiler alert: it depends.

Guest Bios

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Pete Lumbis: Pete, CCIE R&S #28677 and CCDE 2012::3, is the Director of Technical Marketing and Documentation at Cumulus Networks. He helps customers build and design next generation, fully automated datacenters. He can be found on Twitter at @PeteCCDE

Russ White: Who is Russ White? The short answer— he’s worked around electronics from the early 1970’s through the late 1980’s, moved into computers in the 1980’s, and become seriously into network engineering in the late 1980’s. He’s never looked back and if you’re curious to learn more you can find out all you need to know about him via his website here.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

Russ’s podcast “the hedge” can be found via his website listed above or you can find it here.

Resource referenced: Distributed flood optimization 


kernel of truth podcast

Production Ready Automation



Subscribe to Kernel of Truth on iTunes, Google Play, SpotifyCast Box and Sticher!

Click here for our previous episode.

In this episode hosts Roopa Prabhu and Brian O’Sullivan chat with Justin Betz about production grade automation and CI/CD workflows for continuous maintenance and deployment of your “infrastructure as code.” They also discuss how like any other software code, code to manage and automate your infrastructure (IAC) has to be maintained, fixed, withstand hardware and software upgrades — so how do you do that? Finally, the group talks about Open Source production quality automation code. Enjoy!

Guest Bios

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Brian O’Sullivan: Brian currently heads Product Management for Cumulus Linux. For 15 or so years he’s held software Product Management positions at Juniper Networks as well as other smaller companies. Once he saw the change that was happening in the networking space, he decided to join Cumulus Networks to be a part of the open networking innovation. When not working, Brian is a voracious reader and has held a variety of jobs, including bartending in three countries and working as an extra in a German soap opera. You can find him on Twitter at @bosullivan00.

Justin Betz: Justin is a Technical Marketing Engineer at Cumulus Networks. He holds both a CCIE and a CCONP certification and brings over a decade of experience in network operations to help Cumulus change the networking industry. Outside of the office, you’ll find him on the trails, either hiking or mountain biking. Find him on LinkedIn here.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

Give production-ready network automations a try! It’s as simple as copy, paste, deploy. Cumulus in the Cloud now offers the industry’s first open source and fully packaged automation solution. Sign-up for your free 3-day trial here.


kernel of truth podcast

Linux networking with eBPF



Subscribe to Kernel of Truth on iTunes, Google Play, SpotifyCast Box and Sticher!

Click here for our previous episode.

This podcast is all about Linux and to talk about it, we have two of the top Linux kernel experts. Kernel of Truth host Roopa Prabhu is one and chats with our special guest David Ahern about eBPF. If you haven’t heard of eBPF, it’s the hottest Linux kernel technology bringing programmability and acceleration to many Linux subsystems. In this podcast we focus on eBPF’s impact on networking and the million possibilities it brings to the table. 

Guest Bios

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

David Ahern: David is a member of the kernel group within the Systems team at DigitalOcean. His focus right now is networking on hypervisors, and he is working to improve XDP capabilities for cloud hosting environments. Prior to DigitalOcean, he worked on the Linux networking stack for Cumulus Networks, most notably adding support for VRF and improving route scale via nexthop objects.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

Lwn introduction to eBPF: https://lwn.net/Articles/740157/

XDP Documentation: https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/

Bcc-tools:

Bpfrace: high level tracing language for eBPF: https://github.com/iovisor/bpftrace

Bpftrace in buster: https://packages.debian.org/buster/bpftrace

Learn eBPF tracing: http://www.brendangregg.com/blog/2019-01-01/learn-ebpf-tracing.html

Cilium Project:

Using eBPF in Kubernetes: https://kubernetes.io/blog/2017/12/using-ebpf-in-kubernetes/

Project Calico and eBPF: https://www.projectcalico.org/introducing-the-calico-ebpf-dataplane/

Netdev 0x14 Talks:

Cloudflare’s exporter (hooks ebpf to Prometheus): https://github.com/cloudflare/ebpf_exporter

Mellanox ebpf_exporter for dropped flows: https://github.com/Mellanox/mlxsw/wiki/Packet-Drops-Monitoring#ebpf-exporter

libbpf on github: https://github.com/libbpf/libbpf

Brendan Gregg’s web site (contains reference to his latest BPF book and related material): http://brendangregg.com/


kernel of truth podcast

Open Compute Project Summit 2020



Subscribe to Kernel of Truth on iTunes, Google Play, SpotifyCast Box and Sticher!

Click here for our previous episode.

Early March is a busy time here at Cumulus Networks and part of the reason is the Open Compute Project Summit. Kernel of Truth hosts Brian O’Sullivan and Roopa Prabhu are joined by Scott Emery, project lead at OCP. First thing the group covers— what is OCP? The conversation continues into what’s happening in the OCP community, what you can expect at the conference and more.

Guest Bios

Brian O’Sullivan: Brian currently heads Product Management for Cumulus Linux. For 15 or so years he’s held software Product Management positions at Juniper Networks as well as other smaller companies. Once he saw the change that was happening in the networking space, he decided to join Cumulus Networks to be a part of the open networking innovation. When not working, Brian is a voracious reader and has held a variety of jobs, including bartending in three countries and working as an extra in a German soap opera. You can find him on Twitter at @bosullivan00.

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Scott Emery: Scott has been working in the networking industry since the Reagan administration. First at 3Com and then at Grand Junction Networks, where he worked on Fast Ethernet Standards, NICs, and switches. Scott served time at Cisco from when Grand Junction was acquired until 2013 as an architect for software, hardware, and ASICs for the Catalyst 2K and 3K product lines. He now develops software for Cumulus Networks as a Principal Engineer and is a project lead at OCP.

Episode links

Join our community Slack channel here. We’re also on LinkedInTwitterFacebook and Instagram!

Headed to OCP Summit? You can sign-up for our production-ready automation demo happening at our booth C12 here.


kernel of truth podcast

FRRouting update



Subscribe to Kernel of Truth on iTunes, Google Play, SpotifyCast Box and Sticher!

Click here for our previous episode.

Season three jumps right into the deep end of the networking pool with a discussion on FRRouting. Kernel of Truth hosts Brian O’Sullivan and Roopa Prabhu are joined by a new guest to the podcast, Donald Sharp. With FRR being the hottest Open Routing protocol stack today, the group talks about the recent updates and features that are happening at such a high velocity now. What does that mean for the community? Listen to find out. You can also find more about FRRouting at their website here and Twitter here.

Guest Bios

Brian O’Sullivan: Brian currently heads Product Management for Cumulus Linux. For 15 or so years he’s held software Product Management positions at Juniper Networks as well as other smaller companies. Once he saw the change that was happening in the networking space, he decided to join Cumulus Networks to be a part of the open networking innovation. When not working, Brian is a voracious reader and has held a variety of jobs, including bartending in three countries and working as an extra in a German soap opera. You can find him on Twitter at @bosullivan00.

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Donald Sharp: Donald, a Principal Engineer at Cumulus Networks, is a maintainer and on the Technical Steering Committee of the FRRouting project. He has been working at Cumulus Networks over the past 5 years working on a variety of routing protocols with the occasional foray into the Linux Kernel internals. Previously he world at Cisco Systems for 15 years developing EIGRP. You can find Donald on Twitter at @menotyousharp