EVPN Designs: EVPN IBGP over IPv4 EBGP

We’ll conclude the EVPN designs saga with the “most creative” design promoted by some networking vendors: running an IBGP session (carrying EVPN address family) between loopbacks advertised with EBGP IPv4 address family.

Oversimplified IBGP-over-EBGP design

Oversimplified IBGP-over-EBGP design

There’s just a tiny gotcha in the above Works Best in PowerPoint diagram. IBGP assumes the BGP neighbors are in the same autonomous system while EBGP assumes they are in different autonomous systems. The usual way out of that OMG, I painted myself into a corner situation is to use BGP local AS functionality on the underlay EBGP session:

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From Python to Go 004. Arrays, Lists, Slices.

Hello my friend,

In this post we will start exploring how to store multiple values in a single variable. There are multiple approaches how this can be achieved both in Python and Go (Golang). The first one we’ll cover is using ordered something of elements. We’ve used word “something”, because in Python this is called list, whilst Go (Golang) use the term slice. Let’s see what is similar and what is not between Python and Go (Golang).

Who Else Deals With Network Automation?

Just this week there was a massive event Autocon2, which is the biggest gathering of network automation enthusiasts from the entire world. People from different industries shared their experience, success stories and challenges. Whilst many of those insights are different, all of them revolve around the central idea that network automation is a must.

We have started doing network automation trainings before it become mainstream, yet we constantly update its content with new things. Start your training today to onboard the training, which is just leaving the platform.:

We offer the following training programs in network automation for you:

Cisco CML Free Tier (No Kidding)

Cisco CML Free Tier (No Kidding)

I first came across this on LinkedIn that Cisco is introducing a free tier of their Cisco CML platform (starting from version 2.8). My initial reaction was, 'Cisco giving something away for free? That can't be true!' But it turns out, it is. I couldn't wait to try it. I believe it’s limited to five nodes, but I’ll take it.

I could never justify paying $199 per year when there are free alternatives available (EVE-NG, GNS3, Containerlab). If it were a one-time purchase, I might have gone for it, but $199 every year is just too much for me.

In this post, I'll cover how to get the free version and how to install it on VMware Workstation.

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Downloading the CML image requires a Cisco account, which you can create for free. Also, make sure to add your address to your profile, or you might not be able to download it.

Downloading the Image

Head over to the Cisco download page and select CML version 2.8 Free Tier. As I mentioned earlier, you need a Cisco account, which is easy to create. Depending on your installation method, you can choose either the bare-metal or OVA Continue reading

P99 Conf: 3 Ways to Squash Application Latency

We’ve all been frustrated by latency, either as users of an application,  or as developers building such apps. At ScyllaDB‘s annual Pekka Enberg, founder and CTO of shared his favorite tips for spotting and removing latency from systems. “Latency lurks everywhere,” said Enberg, who also has authored a once estimated that it loses 1% of sales for every 100ms of latency. Screenshot Enberg has thought plenty about ways of reducing latency and has boiled down his solutions into three different approaches: Reduce data movement Continue reading

Microsoft Is First To Get HBM-Juiced AMD CPUs

Intel was the first of the major CPU makers to add HBM stacked DRAM memory to a CPU package, with the “Sapphire Rapids” Max Series Xeon 5 processors, but with the “Granite Rapids” Xeon 6, Intel abandoned the use of HBM memory in favor of what it would hope would be more main stream MCR DDR5 main memory, which has multiplexed ranks to boost bandwidth by nearly 2X over regular DDR5 memory. …

Microsoft Is First To Get HBM-Juiced AMD CPUs was written by Timothy Prickett Morgan at The Next Platform.

TNO009: From Network Monitoring to Observability: Make the Leap for Better NetOps

Traditional network monitoring was built around SNMP and logs. And while there’s still a role for these sources, network observability aims to incorporate more data to help you build a holistic picture of the network and its behavior and performance. These sources can include flows, streaming telemetry, APIs, NETCONF, the CLI, deep packet inspection, synthetic... Read more »

Dynamic BGP Peers

You might have an environment where a route reflector (or a route server) has dozens or hundreds of BGP peers. Configuring them by hand is a nightmare; you should either build a decent automation platform or use dynamic BGP neighbors – a feature you can practice in the next lab exercise.

Click here to start the lab in your browser using GitHub Codespaces (or set up your own lab infrastructure). After starting the lab environment, change the directory to session/9-dynamic and execute netlab up.

SC24 Over 10 Terabits per Second of WAN Traffic

The SC24 WAN Stress Test chart shows 10.3 Terabits bits per second of WAN traffic to the The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC24) conference held this week in Atlanta. The conference network used in the demonstration, SCinet, is described as the most powerful and advanced network on Earth, connecting the SC community to the world.

SC24 Real-time RoCEv2 traffic visibility describes a demonstration of wide area network bulk data transmission using RDMA over Converged Ethernet (RoCEv2) flows typically seen in AI/ML data centers. In the example, 3.2Tbits/second sustained trasmissions from sources geographically distributed around the United States was demonstrated.

SC24 Dropped packet visibility demonstration shows how the sFlow data model integrates three telemetry streams: counters, packet samples, and packet drop notifications. Each type of data is useful on its own, but together they provide the comprehensive network wide observability needed to drive automation. Real-time network visibility is particularly relevant to AI / ML data center networks where congestion and dropped packets can result in serious performance degradation and in this screen capture you can see multiple 400Gbits/s RoCEv2 flows.

SC24 SCinet traffic describes the architecture of the real-time monitoring system used to Continue reading

HPE GreenLake Platform Gets Expanded Storage And Custom KVM Hypervisor

When Fidelma Russo looks at Hewlett Packard Enterprise’s GreenLake, she sees a rapidly expanding platform that like others is trying to keep pace not only with the growing demands of organizations that are continuing to adopt the cloud but also are looking for ways to bring in and deploy emerging AI technologies. …

HPE GreenLake Platform Gets Expanded Storage And Custom KVM Hypervisor was written by Jeffrey Burt at The Next Platform.

TL008: How to Hire Top Performers

Hiring is never an easy process. On today’s show, guest Brian Hogan and host Laura Santamaria explore the intricacies of hiring top performers in the tech industry. Brian talks about how to set up a fair and structured interview process, including the use of rubrics to evaluate candidates consistently. He discusses the challenges of assessing... Read more »

N4N004: Essential Topics in Networking: Ethernet, NAT, and More

What are the most essential topics to understand for a new networkers? Ethan Banks and Holly Metlitzky address a listener’s question about foundational topics, covering what a network is, the differences between packet-switched and circuit-switched networks, and the nature of the internet as a “network of networks.” They discuss the importance of Internet Protocol (IP),... Read more »
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