Over the last few episodes of the Hedge, we’ve been talking to folks involved in bringing network products to market. In this episode, Tom Ammon and Russ White talk to Jeff Jakab about the role of the Product Line Manager in helping bring new networking products to life. Join us to understand the roles various people play in the vendor side of the world—both so you can understand the range of roles network engineers can play at a vendor, and so you can better understand how products are designed, developed, and deployed.
Software Eats the World?
I’m told software is going to eat the world very soon now. Everything already is, or will be, software based. To some folks, this sounds completely wonderful, but—leaving aside the privacy issues—I still see an elephant in the room with this vision of the future.
Quality.
Let me give you some recent examples.
First, ceiling fans. Modern ceiling fans, in case you didn’t know, don’t rely on the wall switch and pull chains. Instead, they rely on remote controls. This is brilliant—you can dim the light, change the speed of the fan, etc., from a remote control. No unsightly chains hanging from the ceiling.
Well, it’s brilliant so long as it works. I’ve replaced three of the four ceiling fans in my house. Two of the remote controls have somehow attached themselves to two of the three fans. It’s impossible to control one of the fans without also controlling the other. They sometimes get into this entertaining mode where turning one fan off turns the other one on.
For the third one—the one hanging from a 13-foot ceiling—the remote control sometimes operates one of the other fans, and sometimes the fan its supposed to operate. Continue reading
The Technical Marketing role is often misunderstood—or simply forgotten—in the vendor world. What does the TME do, and why? What value does the TME bring to the development and release of new products? Pete Lumbis joins Tom Ammon and Russ White to discuss the importance and value of the TME.
Machine Learning (ML) and Artificial Intelligence (AI) are all the rage in the network engineering world. Where might these technologies be useful, as opposed to mere hype? The two most obvious areas where AI and ML would be useful are failure reaction and security. Micah Mussler joins Tom Ammon and Russ White to discuss the possibilities of using AI and/or ML in the broader security market—and focusing in on the network.
SRv6, a form of source routing, is the new and interesting method being created by the IETF to allow traffic engineering and traffic steering. This is not the first time the networking world has tried source routing, however—and in the spirit of rule 11, we should ask some questions. How and why did source routing fail last time? Have we learned those lessons and changed the way we’re doing things to overcome those limitations? Security seems to be one area where problems arise in the source routing paradigm.
Andrew Alston joins Tom Ammon and Russ White to discuss security in SRv6.
What is the “core” of the DNS system, and how has it changed across the years? Edward Lewis joins Tom Ammon and Russ White to discuss his research into what the “core” of the domain name system is and how it has changed—including the rise of the large cloud players to the core of the default free zone.
Way in the past, the EIGRP team (including me) had an interesting idea–why not aggregate routes automatically as much as possible, along classless bounds, and then deaggregate routes when we could detect some failure was causing a routing black hole? To understand this concept better, consider the network below.
In this network, B and C are connected to four different routers, each of which is advertising a different subnet. In turn, B and C are aggregating these four routes into 2001:db8:3e8:10::/60, and advertising this aggregate towards A. From a control plane state perspective, this is a major win. The obvious gain is that the amount of state is reduced from four routes to one. The less obvious gain is A doesn’t need to know about any changes in the state for the four destinations aggregated into the /60. Depending on how often these links change state, the reduction in the rate of change is, perhaps, more important than the reduction in the amount of control plane state.
We always know there will be a tradeoff when reducing state; what is the tradeoff here? If C somehow loses its connection to one of the four routers, say the router advertising 11::/64, Continue reading
Engineers (and marketing folks) love new technology. Watching an engineer learn or unwrap some new technology is like watching a dog chase a squirrel—the point is not to catch the squirrel, it’s just that the chase is really fun. Join Andrew Wertkin (from BlueCat Networks), Tom Ammon, and Russ White as we discuss the importance of simple, boring technologies, and moderating our love of the new.
This Friday (the 12th) I’m presenting a live webinar on How Routers Really Work over at Pearson. From the description:
This training will peer into the internal components of a router, starting with an explanation of how a router switches packets. This walk through of a switching path, in turn, will be used as a foundation for explaining the components of a router, including the various tables used to build forwarding tables and the software components used to build these tables.
Please join me by registering here.
I’ve changed just a few of the slides from the last time I gave this talk and reordered some things.
Whether you’re just starting in your technology career, or you’re an old hand who likes to go back to basics and understand how to move forward in your career, this episode of the Hedge is for you. Terry Slattery joins Tom Ammon and Russ White to discuss the things you can do to build a successful career as in the world of network engineering.