Welcome!

Linux Containers Authors: Yeshim Deniz, Liz McMillan, Elizabeth White, Eric Robertson, Pat Romanski

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

SDN Journal: Blog Feed Post

What a Network Engineer Does

Network Engineering workflow can be characterized by overlapping cycles of Activity and Modeling

In a previous article, we talked about “Short T’s.”  We talked about how, in network engineering, the “T” is very long:  Configuring a network to achieve business goals requires considerable skill and knowledge.  While we set up a conceptual model in that post to talk about what “T” means in general terms, we did not discuss in detail how to articulate “T” more specifically for network engineering.  In this post, we’ll explore this in a little more detail.

The NetEng Cycle

Figure 1: The Network Engineering Cycle

Network Engineering workflow can be characterized by overlapping cycles of Activity and Modeling.  In figure 1, I have depicted 4 cycles.  From smallest timescale to largest, these are called:  1. Referential Traversal, 2. Interactive, 3. Design, and 4. Architecture.  The crest of each of these cycles is “Activity” and the trough is “Modeling.”  Modeling on the smaller cycles is simple and correlative, while on the larger cycles it is more abstract and analytical.  Activity on the smaller cycles is characterized by direct interactivity with the network, while on larger scales it is indirect and more design oriented.

As is implied from the diagram, a network engineer will oscillate between activities and modeling.  For instance, in the interactive cycle, they may configure a QoS classification policy, but then immediately issue show commands to see if traffic is being classified appropriately.  Configuring a policy and issuing of show commands are activities, but the show commands start to transition into modeling.  The engineer is attempting to model the immediate effect of the changes they have made.  Based on this modeling of “how things are,” the engineer might start thinking about modifications to the classification policy to bring the operation of the network closer to an expected model of “how things should be.”  As far as it is possible to do so, an attempt might be made to model “how things will be” to check for possible side effects.  The cycle, then, repeats.

Referential Space
However, which show commands should they use to accurately model how the configuration is actually working?  If you were to write down the exact sequence of commands, you might find that the engineer is taking data from the output of the first command and using that as either input into the second command, or as a point of reference while examining output from the second command.  The output from the second command might be, in turn, used similarly when executing a third show command.  This is what is called Referential Traversal.  Referential Traversal is when a network engineer engages in iterative data correlation in support of a workflow.  In the context of a workflow, this data represents that workflow’s state.

Another well known referential traversal is doing a manual packet-walk of the network:  Examining nodes along the way to determine if there is a potential issue along the path between two endpoints on the edge of the network.  Here, the engineer will examine lookup tables, arp entries, and LLDP neighbor information, jumping from one node to the next.  This particular workflow can tangent in tricky ways such as examining when and what configuration changes were made to see if they could impact traffic between those two endpoints.  When tangenting into examination of a device configuration, you enter a different set of correlated data:  A route-map applied to an interface can, in turn, reference access-lists or prefix-lists.  The rules for evaluating packet flow through a policy follows different logic than the general rules for packet flow across a series of devices.

Figure 2: Referential Space

Figure 2: Referential Space

If you take the set of rules, relationships, and data points from “configuration space” and the rules, relationships, and data points from the “forwarding space,” and you combine them with all other such spaces that a network engineer must deal with in the course of their activities, the sum of these is called “referential space” (See Figure 2).  A network engineering workflow will follow some referential path through this space, examining data and following it’s relationships to yet other data.  There are numerous interconnected spaces in the management, control, forwarding, and device planes of a network each with their own logic and types of data. There are more abstract spaces as well, such as a “design” space that contains the rules and relationships that govern network design.  A network engineer’s expertise is measured by how well they can navigate referential space in support of longer time-scale cycles.

Enablement versus Obviation
The challenge of networking, and the reason that automation (and UX/UI for that matter) has not evolved terribly well, is that these referential paths vary greatly based on what the network engineer is trying to do and how a particular network is built.  There is a vast set of rules governing the many relationships that exist between the seemingly infinite array of data types.  The dynamic nature of referential traversal, and the intimidating size of referential space, should justify a healthy skepticism of vendors claiming to encapsulate network complexity or automate network workflows.  More often than not, they are simply moving the complexity around, while making it more difficult to navigate in the process.

It’s long since overdue to move innovation in networking towards enabling network engineers to be more effective instead of trying to obviate them.  Unlike the past, this should happen with a keen understanding of what network engineers actually do and how they think through their activities.  We can augment these activities to reduce time-to-completion, and reduce time-to-insight while at the same reducing risk and increasing accountability.  There are many networking workflows, which after 20 years, are still notoriously difficult and risky to model and complete.  Let’s solve these problems first.

Make Things Better
As a network engineer, how many times have you heard about the glorious wonders of a product that automates networking or encapsulates network complexity in some way?  After 20 years, we have been trained to identify this language as snake-oil, or perhaps a little nicer, “marketing speak.”  When we buy into these products or features, it’s always just a matter of time before they go unused, or the ugly realities of their operation surfaces.

Encapsulating network complexity, or automating network workflows, can’t just be about “faster.”  That’s only part of the problem.  It has to make things “better.”  This can only happen with a deeper understanding of referential space.

The post What a Network Engineer Does appeared first on Plexxi.

Read the original blog entry...

More Stories By Derick Winkworth

Derick Winkworth has been a developer, network engineer, and IT architect in various verticals throughout his career.He is currently a Product Manager at Plexxi, Inc where he focuses on workflow automation and product UX.

@ThingsExpo Stories
SYS-CON Events announced today that Loom Systems will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Founded in 2015, Loom Systems delivers an advanced AI solution to predict and prevent problems in the digital business. Loom stands alone in the industry as an AI analysis platform requiring no prior math knowledge from operators, leveraging the existing staff to succeed in the digital era. With offices in S...
SYS-CON Events announced today that Interoute, owner-operator of one of Europe's largest networks and a global cloud services platform, has been named “Bronze Sponsor” of SYS-CON's 20th Cloud Expo, which will take place on June 6-8, 2017 at the Javits Center in New York, New York. Interoute is the owner-operator of one of Europe's largest networks and a global cloud services platform which encompasses 12 data centers, 14 virtual data centers and 31 colocation centers, with connections to 195 add...
SYS-CON Events announced today that HTBase will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. HTBase (Gartner 2016 Cool Vendor) delivers a Composable IT infrastructure solution architected for agility and increased efficiency. It turns compute, storage, and fabric into fluid pools of resources that are easily composed and re-composed to meet each application’s needs. With HTBase, companies can quickly prov...
SYS-CON Events announced today that CA Technologies has been named “Platinum Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CA Technologies helps customers succeed in a future where every business – from apparel to energy – is being rewritten by software. From ...
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
Web Real-Time Communication APIs have quickly revolutionized what browsers are capable of. In addition to video and audio streams, we can now bi-directionally send arbitrary data over WebRTC's PeerConnection Data Channels. With the advent of Progressive Web Apps and new hardware APIs such as WebBluetooh and WebUSB, we can finally enable users to stitch together the Internet of Things directly from their browsers while communicating privately and securely in a decentralized way.
Keeping pace with advancements in software delivery processes and tooling is taxing even for the most proficient organizations. Point tools, platforms, open source and the increasing adoption of private and public cloud services requires strong engineering rigor - all in the face of developer demands to use the tools of choice. As Agile has settled in as a mainstream practice, now DevOps has emerged as the next wave to improve software delivery speed and output. To make DevOps work, organization...
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm.
What sort of WebRTC based applications can we expect to see over the next year and beyond? One way to predict development trends is to see what sorts of applications startups are building. In his session at @ThingsExpo, Arin Sime, founder of WebRTC.ventures, will discuss the current and likely future trends in WebRTC application development based on real requests for custom applications from real customers, as well as other public sources of information,
TechTarget storage websites are the best online information resource for news, tips and expert advice for the storage, backup and disaster recovery markets. By creating abundant, high-quality editorial content across more than 140 highly targeted technology-specific websites, TechTarget attracts and nurtures communities of technology buyers researching their companies' information technology needs. By understanding these buyers' content consumption behaviors, TechTarget creates the purchase inte...
With the introduction of IoT and Smart Living in every aspect of our lives, one question has become relevant: What are the security implications? To answer this, first we have to look and explore the security models of the technologies that IoT is founded upon. In his session at @ThingsExpo, Nevi Kaja, a Research Engineer at Ford Motor Company, will discuss some of the security challenges of the IoT infrastructure and relate how these aspects impact Smart Living. The material will be delivered i...
In his session at @ThingsExpo, Eric Lachapelle, CEO of the Professional Evaluation and Certification Board (PECB), will provide an overview of various initiatives to certifiy the security of connected devices and future trends in ensuring public trust of IoT. Eric Lachapelle is the Chief Executive Officer of the Professional Evaluation and Certification Board (PECB), an international certification body. His role is to help companies and individuals to achieve professional, accredited and worldw...
Your homes and cars can be automated and self-serviced. Why can't your storage? From simply asking questions to analyze and troubleshoot your infrastructure, to provisioning storage with snapshots, recovery and replication, your wildest sci-fi dream has come true. In his session at @DevOpsSummit at 20th Cloud Expo, Dan Florea, Director of Product Management at Tintri, will provide a ChatOps demo where you can talk to your storage and manage it from anywhere, through Slack and similar services ...
My team embarked on building a data lake for our sales and marketing data to better understand customer journeys. This required building a hybrid data pipeline to connect our cloud CRM with the new Hadoop Data Lake. One challenge is that IT was not in a position to provide support until we proved value and marketing did not have the experience, so we embarked on the journey ourselves within the product marketing team for our line of business within Progress. In his session at @BigDataExpo, Sum...
SYS-CON Events announced today that Ocean9will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Ocean9 provides cloud services for Backup, Disaster Recovery (DRaaS) and instant Innovation, and redefines enterprise infrastructure with its cloud native subscription offerings for mission critical SAP workloads.
SYS-CON Events announced today that Linux Academy, the foremost online Linux and cloud training platform and community, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Linux Academy was founded on the belief that providing high-quality, in-depth training should be available at an affordable price. Industry leaders in quality training, provided services, and student certification passes, its goal is to c...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 20th International Cloud Expo, which will take place on June 6–8, 2017, at the Javits Center in New York City, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
SYS-CON Events announced today that T-Mobile will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...
SYS-CON Events announced today that Cloudistics, an on-premises cloud computing company, has been named “Bronze Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Cloudistics delivers a complete public cloud experience with composable on-premises infrastructures to medium and large enterprises. Its software-defined technology natively converges network, storage, compute, virtualization, and management into a ...
SYS-CON Events announced today that Infranics will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Since 2000, Infranics has developed SysMaster Suite, which is required for the stable and efficient management of ICT infrastructure. The ICT management solution developed and provided by Infranics continues to add intelligence to the ICT infrastructure through the IMC (Infra Management Cycle) based on mathemat...