BGP Optimal Route Reflection

3 December 2018 | 1 Comment

Policy at the Edge

20 November 2018 | Comments Off on Policy at the Edge

Is BGP Good Enough?

3 September 2018 | Comments Off on Is BGP Good Enough?

In a recent podcast, Ivan and Dinesh ask why there is a lot of interest in running link state protocols on data center fabrics. They begin with this point: if you have less than a few hundred switches, it really doesn’t matter what routing protocol you run on your data center fabric. Beyond this, there…

Short Take: State, Optimization, and Surface

29 August 2018 | Comments Off on Short Take: State, Optimization, and Surface

Reaction: Network software quality

16 August 2018 | Comments Off on Reaction: Network software quality

Over at IT ProPortal, Dr Greg Law has an article up chiding the networking world for the poor software quality. To wit— When networking companies ship equipment out containing critical bugs, providing remediation in response to their discovery can be almost impossible. Their engineers back at base often lack the data they need to reproduce…

The Network Collective: Networking in Harsh Environments

14 August 2018 | Comments Off on The Network Collective: Networking in Harsh Environments

On the ‘net: Simplifying Network Design

25 July 2018 | Comments Off on On the ‘net: Simplifying Network Design

For various reasons, humans tend to prefer complex resolutions to simple ones. The combined effect of many humans preferring more complex resolutions over time means large-scale systems tend to accrue complexity, until they fall into a complexity wormhole, becoming wholly incomprehensible. @Search Networking

On the ‘net: The Tradeoffs of Information Hiding

16 July 2018 | Comments Off on On the ‘net: The Tradeoffs of Information Hiding

I recently joined Ethan Banks for a Packet Pushers episode around the trade offs of hiding information in the control plane. This was a terrific show; you can listen to it by clicking on the link below. Today on the Priority Queue, we’re gonna hide some information. Oh, like route summarization? Sure, like route summarization.…

Short Take: The Subsidiarity Principle

2 May 2018 | Comments Off on Short Take: The Subsidiarity Principle

The Universal Fat Tree

30 April 2018 | 5 Comments

Have you ever wondered why spine-and-leaf networks are the “standard” for data center networks? While the answer has a lot to do with trial and error, it turns out there is also a mathematical reason the fat-tree spine-and-leaf is is used almost universally. There often is some mathematical reason for the decisions made in engineering,…