Thoughts on Auto Disaggregation and Complexity

15 November 2021 | Comments Off on Thoughts on Auto Disaggregation and Complexity

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.

Hedge 108: In Defense of Boring Technology with Andrew Wertkin

11 November 2021 | Comments Off on Hedge 108: In Defense of Boring Technology with Andrew Wertkin

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.

Details and Complexity

28 June 2021 |

What is the first thing almost every training course in routing protocols begin with? Building adjacencies. What is considered the “deep stuff” in routing protocols? Knowing packet formats and processes down to the bit level. What is considered the place where the rubber meets the road? How to configure the protocol.

I’m not trying to cast aspersions at widely available training, but I sense we have this all wrong—and this is a sense I’ve had ever since my first book was released in 1999. It’s always hard for me to put my finger on why I consider this way of thinking about network engineering less-than-optimal, or why we approach training this way.

Ambiguity and complexity: once more into the breach

3 May 2021 | Comments Off on Ambiguity and complexity: once more into the breach

Recent research into the text of RFCs versus the security of the protocols described came to this conclusion—

While not conclusive, this suggests that there may be some correlation between the level of ambiguity in RFCs and subsequent implementation security flaws.

If you haven’t found the tradeoffs …

26 April 2021 |

One of the big movements in the networking world is disaggregation—splitting the control plane and other applications that make the network “go” from the hardware and the network operating system. This is, in fact, one of the movements I’ve been arguing in favor of for many years—and I’m not about to change my perspective on the topic.

Complexity Reduction?

19 April 2021 |

Back in January, I ran into an interesting article called The many lies about reducing complexity:

Reducing complexity sells. Especially managers in IT are sensitive to it as complexity generally is their biggest headache. Hence, in IT, people are in a perennial fight to make the complexity bearable.

The Insecurity of Ambiguous Standards

29 March 2021 | Comments Off on The Insecurity of Ambiguous Standards

Why are networks so insecure?

One reason is we don’t take network security seriously. We just don’t think of the network as a serious target of attack. Or we think of security as a problem “over there,” something that exists in the application realm, that needs to be solved by application developers. Or we think the consequences of a network security breach as “well, they can DDoS us, and then we can figure out how to move load around, so if we build with resilience (enough redundancy) we’re already taking care of our security issues.” Or we put our trust in the firewall, which sits there like some magic box solving all our problems.

Complexity Bites Back

15 March 2021 |

What percentage of business-impacting application outages are caused by networks? According to a recent survey by the Uptime Institute, about 30% of the 300 operators they surveyed, 29% have experienced network related outages in the last three years—the highest percentage of causes for IT failures across the period.

A secondary question on the survey attempted to “dig a little deeper” to understand the reasons for network failure; the chart below shows the result.

The Hedge 74: Brian Keys and the Complexity of User Interfaces

11 March 2021 | Comments Off on The Hedge 74: Brian Keys and the Complexity of User Interfaces

Crossing from the domain of test pilots to the domain of network engineering might seem like a large leap indeed—but user interfaces and their tradeoffs are common across physical and virtual spaces. Brian Keys, Eyvonne Sharp, Tom Ammon, and Russ White as we start with user interfaces and move into a wider discussion around attitudes and beliefs in the network engineering world.

God Objects Considered Harmful

18 January 2021 | Comments Off on God Objects Considered Harmful

Every software developer has run into “god objects”—some data structure or database that every process must access no matter what it is doing. Creating god objects in software is considered an anti-pattern—something you should not do. Perhaps the most apt description of the god object I’ve seen recently is you ask for a banana, and you get the gorilla as well.