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Are they really the future of the Internet?

 

The Internet continues to evolve in ways that its founders had not initially anticipated. Yet we take for granted that its evolutionand the resources that drive itwere all part of some master plan of efficiency and transparency. Unfortunately, this is not the case.

 

For instance, consider how this page that you are currently reading has arrived on your computer screen or on your tablet or phone. It was assembled on the fly from a variety of elements referenced from multiple servers that exist at numerous physical locations.

 

Yet, the architects of the Internet didn't really expect this kind of composite information flow. Indeed, their vision of online news service was popularly reported in 1981 in a broadcast on a San Francisco television station.

 

That vision of how the Internet would work was based on the client/server model, in which a single server located in one place delivered a stream of information to multiple client machines at multiple locations.

 

Client/server computing is still with us, of course, but the services have fragmented and the architectures by which information is communicated have radically changed. Instead of a preponderance of north-south, client/server traffic, today's Internet environments typically consume more resources communicating east-to-west, server-to-server, as web pages are knitted together from hundreds or thousands of elements that exist on multiple servers and are ultimately delivered to your browser as a single page.

 

According to analysts at WebsiteOptimization.com the size and complexity of web pages has been increasing at an alarming rate. They tell us that web page size has increased by between 71% and 76% over the past two years alone. At the same time, the number of web objects has increased by 16.2% to 28.2%. Consequently, despite increases in bandwidth, the load time of web pages has increased by 48% over the past two years. In fact, the actual size of the average web page has tripled since 2008. But more alarming from a bandwidth perspective is the fact that the average number of objects referenced by a web page has recently topped 100 per page. This means that for every web page delivered north-to-south from a web server node to a web browser, there was an average of 100 resource calls to other servers on other network nodes, east-west—accessing data, interpreting code, assembling graphics, etc.—all to deliver the web page in HTML.

 

This trend has been intensified by the revolution in server virtualization and storage virtualization, and becomes exceptionally pronounced in Software as a Service (SaaS) and cloud computing environments. Instead of all the activity occurring on a single server, it's spread across a spectrum of virtual devices, all connected through the IP and Ethernet backbones of the network's nodes. As a result, network administrators are witnessing a radical new pattern in east-west network traffic and wondering how the resulting bottlenecks can be opened.

 

The bottom line is that this virtualization revolution now requires greater bandwidth between networked nodes, more resilient routing technologies, and a substantially more streamlined approach to the configuration and the maintenance of the network nodes that support our information systems.

 

But how can we streamline the architecture? To understand the problem, we need to go back to one of the first structures created by IP. It's something called Spanning Tree Protocol (STP).

Spanning Tree Protocol

STP is a protocol that operates in the Layer 2 data link layer of the OSI model. It runs primarily on Ethernet network bridges and switches and was formally defined in the IEEE 802.ID specification. The main purpose of STP is to ensure that a network node doesn't send information in a loop in the network when there are redundant pathways.

 

A network of switches needs redundant pathways between nodes in the event that the primary path is disconnected. However, without some method to manage the flow of traffic, there's a real potential that information will essentially "echo" as it travels through the redundant pathways.

 

STP solves the echoing problem with a relatively simple set of rules that's based upon the physical connections between nodes. Essentially, in STP, every networked node has two paths, one that's identified as the primary path, and one that's secondary (defined as "disabled" by STP). If a network transaction fails to reach its partnered device through the primary pathway, the secondary pathwayconnecting to a different partnered deviceis activated. Any disruption to the pathways, therefore, creates a cascade of new connections that dynamically routes traffic around the disruption, much like a cascade of marbles through a hierarchical maze.

 

STP works well when there's a limited number of network node switches and when the traffic is essentially north-south in a client/server environment. After all, the purpose of a network in a client/server scenario is to reliably connect one server with multiple clients.

Limitations of STP

However, STP bottlenecks communication when the number of networked node devices that need to be communicating with one another increases in a non-hierarchical manner. For instance, bottlenecks occur when one web server needs to link to other servers to access the database, interpret PHP, assemble content, parse parameters, access image files, and then assemble and spew out the desired web page. In that scenario, the east-west traffic is far more intense than the final page delivered as HTML to the browser. Why? Because each traffic element has to wend its way east-west through the maze of nodes defined by the physical connections of the spanning tree.

 

Of course, STP has evolved significantly with many different versions of algorithms that define different proprietary network topologies. These algorithms include Rapid Spanning Tree Protocol (RSTP), Per-VLAN Spanning Tree (PVST) and Per-VLAN Spanning Tree Plus (PVST+), and Multiple Spanning Tree Protocol (MSTP). Each protocol has particular strengths, but all have faults that exclude backward compatibility with other STP implementations, increase management complexity, and fail to provide resiliency as the network traffic changes in response to user requests.

Fabric Network Topologies

It's against this limitation of STP that Fabric Network Topologies were engineered. By comparison to an STP topology, a fabric network is a non-hierarchical topology by which nodes connect with one another via one or more crossbar switches.

 

A crossbar switch is a switching device that has multiple input and output points arranged in a matrix that conceptually appears as a sort of woven fabric-like structure. The value of crossbar switching is that it permits addressing any input point with any output point touched by the switch. So, instead of having just two network nodes physically connected to a switching device, a crossbar switch might have up to 100 devices virtually connected.

 

The theoretical advantage of a fabric network then is how it "flattens" the network topology, removing the hierarchy, reducing potential bottlenecks in throughput, enabling faster east-west traffic, and permitting easier maintenance and configuration. In a fabric network, the address of every network node is known to the switching mechanism, and the switch is able to directly address and route frames to every other node within the network. This any-to-any capability increases bandwidth by reducing latency and complexity. Fabric topologies can co-exist with STP topologies and act as a superset to control those nodes. This makes a fabric topology a good management tool for companies that wish to expand their network without disrupting the existing STP topology.

 

Fabric Network Switches, then, are physical devices that act in a combined manner as both a router and a bridge between nodes, often technically described as RBridges. They are engineered devices that most commonly use a protocol called Transparent Interconnection of Lots of Links, or TRILL, which is an Internet Engineering Task Force (IETF) standard.

The Current Protocol Wars and the Future of the Network

Network engineers are now having a great debate about fabric switches that use the TRILL protocol, versus a new multipath protocol called Shortest Path Bridging, which became an IEEE standard in May of 2012. It's the nature of the network switch technology market that each vendor has a preferred technology, founded in one engineering standard. That's what's happening now by the various vendors, and considering what the network switches cost, it's easy to understand how engineers of different technology companies are pitted against one another.

 

It's not within the purview of this article to express an opinion about each multipath protocol or the implementing technology, except to comment that it's important to understand that fabric network technology is evolving rapidly. The arena of engineered protocols is expanding rapidly, and there are proprietary and open standards specifications that are utilized by different vendor devices. What your network administrator or cloud service provider might choose for your environment will be determined by cost, reliability, vendor support, and the way the preexisting network is configured and managed. But fabric isn't the only burgeoning technology on the horizon.

Software-Defined Networks

Finally, there is a third technological approach that some network administrators believe will provide a still more resilient network. This technology, called Software-Defined Network (SDN), is so new that today it seems to represent more buzz than substance. Indeed, some vendors are latching onto SDN nomenclature as a way to package their own proprietary networking technologies into the loosely defined abstractions of SDN. How this technological approach evolves may represent the ultimate future of how the OSI model for network topologies continues to develop. Or it may represent another side street that draws networks to a technological dead end.

What's to Come

Regardless of how the technologies arrive or disappearlike the virtual newspapers described in the news broadcast back in 1981there's no doubt that we're experiencing incredible change in how our networks are functioning. The problems our network administrators are witnessing probably won't be solved by any single standard protocol or by the selection of an individual vendor's proprietary solution. What we're seeing is an incredibly rapid evolution of engineered devices to meet the demands of our networks and overcome the problems the networks experience. It's a fantastic flood of new ideas, inventions, protocols, and devices.

 

This is the real nature of the virtual environments that are supporting our networks, and it's the talents of our network engineers and the dynamics of the technology marketplace that will determine the real future of the Internet.

 

Thomas Stockwell

Thomas M. Stockwell is an independent IT analyst and writer. He is the former Editor in Chief of MC Press Online and Midrange Computing magazine and has over 20 years of experience as a programmer, systems engineer, IT director, industry analyst, author, speaker, consultant, and editor.  

 

Tom works from his home in the Napa Valley in California. He can be reached at ITincendiary.com.

 

 

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    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.