Welcome!

Related Topics: SDN Journal, Java IoT, Microservices Expo, Linux Containers, Containers Expo Blog, @CloudExpo

SDN Journal: Blog Post

Complexity Kills Networks

Over 20 years of networking have created an astounding amount of capabilities

In reviewing some opportunities for Plexxi this week, I was reminded that we have made things very hard on ourselves. Through no one’s fault but our own we have created monsters of networks that are impossible to maintain, debug, diagnose and understand.

I have been lucky in my career. Most of it has been in an R&D organization for a large network vendor, but always in positions where I was close to customers, close to customer networks, and of course with that comes the “close to customer networks that are not working well”. And while there are always exceptions, in most of these troublesome networks, the sheer complexity of the network contributed significantly to the problem at hand, even if the end result was a bug.

Finding and fixing issues in networks is often one of these activities where you spent almost half your time understanding the network and its intricacies, a quarter of the time debugging and diagnosing the actual problem, and a last quarter producing, testing and implementing the solution. And so often the problem is hidden in the understanding of the network. An additional link that was not documented. A spanning tree config that was slightly different on one switch. A LAG with slightly different LACP timers. One vendor’s version of MLAG behaving just slightly different than another. And the guy that configured it no longer works here.

Whether it is a support person hunting for a problem, or a sales engineer trying to propose a new design or product, the process always almost starts with pictures. Network diagrams are the most powerful thing we produce. They are also the most misleading piece of information we produce because without fail they are wrong. Or missing something that is really important for that one specific item you are chasing. Network engineers and architects love to draw, our world exists of boxes, circles and lines between them. The challenge is that a 2 dimensional representation of a network is always going to be abstracted and therefore will always miss something. A network diagram that articulates the overall architecture and design of a network is absolutely key and with a clean sheet of paper we always start out with something that is sensible, easy to understand and typically simple. And then weeks, months and even years of incremental needs and requirements start eating away at the clean design.

Over 20 years of networking have created an astounding amount of capabilities. What we have taught our switches and routers to do is really amazing, and our packet forwarding chip vendors have done an equally outstanding job keeping up pushing these capabilities into hardware. And lots of these capabilities slowly make it into your network, chipping away at what was the “perfect” architecture. In the end, we are configuring individual devices with endless amounts of functions. Functions that should be so simple you should not have to configure them by hand.

We all know that ethernet networks need to be loop free. It should be dreadfully simple to instruct your devices to “make it so”. Except that we have at least five ways to ensure it is loop free. And then only for a specific portion of the network. We all know VoIP traffic should get  preferred treatment over regular internet or other traffic. But in the end we configure complicated access lists and mappings to DSCP values that then map into queues that then have to be hand crafted into a scheduling mechanism we believe does not mess up the original voice traffic we cared about, or the other important traffic. We know routers needs to exchange subnet information for reachability. But we end up with rather complicated protocols that have endless options, some apply globally, some to interfaces, some need filtering, some need adjusted timers, you name it.

Your equipment vendor will tell you that there will be bugs. A switch or router is no different than a regular application, there are millions of lines of code and bug free code does not exist. We as vendors need to help the network architect, manager and operator. We have to make it much easier to implement the functionality you require. You can help yourself by uncluttering your network as a regular activity. Think back to those pristine network diagrams you created before the network was installed. Instead of adjusting the diagram to represent reality, perhaps it is worth spending some time adjusting the network back to the diagram.

[Today's fun fact: there is an actual website where you can submit network diagrams to be rated by the viewing public. Really. http://www.ratemynetworkdiagram.com]

The post Complexity Kills Networks appeared first on Plexxi.

Read the original blog entry...

More Stories By Marten Terpstra

Marten Terpstra is a Product Management Director at Plexxi Inc. Marten has extensive knowledge of the architecture, design, deployment and management of enterprise and carrier networks.

Latest Stories
When it comes to cloud computing, the ability to turn massive amounts of compute cores on and off on demand sounds attractive to IT staff, who need to manage peaks and valleys in user activity. With cloud bursting, the majority of the data can stay on premises while tapping into compute from public cloud providers, reducing risk and minimizing need to move large files. In his session at 18th Cloud Expo, Scott Jeschonek, Director of Product Management at Avere Systems, discussed the IT and busine...
As hybrid cloud becomes the de-facto standard mode of operation for most enterprises, new challenges arise on how to efficiently and economically share data across environments. In his session at 21st Cloud Expo, Dr. Allon Cohen, VP of Product at Elastifile, will explore new techniques and best practices that help enterprise IT benefit from the advantages of hybrid cloud environments by enabling data availability for both legacy enterprise and cloud-native mission critical applications. By rev...
Organizations do not need a Big Data strategy; they need a business strategy that incorporates Big Data. Most organizations lack a road map for using Big Data to optimize key business processes, deliver a differentiated customer experience, or uncover new business opportunities. They do not understand what’s possible with respect to integrating Big Data into the business model.
Companies are harnessing data in ways we once associated with science fiction. Analysts have access to a plethora of visualization and reporting tools, but considering the vast amount of data businesses collect and limitations of CPUs, end users are forced to design their structures and systems with limitations. Until now. As the cloud toolkit to analyze data has evolved, GPUs have stepped in to massively parallel SQL, visualization and machine learning.
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, will discuss how they b...
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities – ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups. As a result, many firms employ new business models that place enormous impor...
The next XaaS is CICDaaS. Why? Because CICD saves developers a huge amount of time. CD is an especially great option for projects that require multiple and frequent contributions to be integrated. But… securing CICD best practices is an emerging, essential, yet little understood practice for DevOps teams and their Cloud Service Providers. The only way to get CICD to work in a highly secure environment takes collaboration, patience and persistence. Building CICD in the cloud requires rigorous a...
SYS-CON Events announced today that Dasher Technologies will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Dasher Technologies, Inc. ® is a premier IT solution provider that delivers expert technical resources along with trusted account executives to architect and deliver complete IT solutions and services to help our clients execute their goals, plans and objectives. Since 1999, we'v...
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.
Data scientists must access high-performance computing resources across a wide-area network. To achieve cloud-based HPC visualization, researchers must transfer datasets and visualization results efficiently. HPC clusters now compute GPU-accelerated visualization in the cloud cluster. To efficiently display results remotely, a high-performance, low-latency protocol transfers the display from the cluster to a remote desktop. Further, tools to easily mount remote datasets and efficiently transfer...
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, will provide a fun and simple way to introduce Machine Leaning to anyone and everyone. Together we will solve a machine learning problem and find an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intellige...
SYS-CON Events announced today that TidalScale, a leading provider of systems and services, will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. TidalScale has been involved in shaping the computing landscape. They've designed, developed and deployed some of the most important and successful systems and services in the history of the computing industry - internet, Ethernet, operating s...
SYS-CON Events announced today that TidalScale will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. TidalScale is the leading provider of Software-Defined Servers that bring flexibility to modern data centers by right-sizing servers on the fly to fit any data set or workload. TidalScale’s award-winning inverse hypervisor technology combines multiple commodity servers (including their ass...
Gemini is Yahoo’s native and search advertising platform. To ensure the quality of a complex distributed system that spans multiple products and components and across various desktop websites and mobile app and web experiences – both Yahoo owned and operated and third-party syndication (supply), with complex interaction with more than a billion users and numerous advertisers globally (demand) – it becomes imperative to automate a set of end-to-end tests 24x7 to detect bugs and regression. In th...
Amazon is pursuing new markets and disrupting industries at an incredible pace. Almost every industry seems to be in its crosshairs. Companies and industries that once thought they were safe are now worried about being “Amazoned.”. The new watch word should be “Be afraid. Be very afraid.” In his session 21st Cloud Expo, Chris Kocher, a co-founder of Grey Heron, will address questions such as: What new areas is Amazon disrupting? How are they doing this? Where are they likely to go? What are th...