Networking's greatest debates in LANS + WANS

Including IPv4 vs. IPv6, routing vs. switching, Packet switching vs. circuit switching, Ethernet vs. Token Ring, and Cisco vs. the rest,

Routing vs. switching

It was the debate that separated Cisco from the pack and forever changed the enterprise network industry.

The routing vs. switching wars of the mid-1990s pitted routing kingpin Cisco against virtually every other competitor in the enterprise space: Bay Networks, 3Com, and Cabletron, which all promoted a flat, Layer 2 switched infrastructure.

At its root, the debate centered around whether businesses should construct hierarchical router networks in order to better segment and administer traffic and workgroups; or if flat Layer 2 infrastructures with virtual LANs establishing broadcast domains did the same thing, only less expensively.

The stand-off also ushered in technologies such as the routing hub -- or "Rub" -- and the Layer 3 switch. It also produced such innovations as Ipsilon's IP Switching, and Cisco's Tag Switching for service providers, one of the early incarnations of what is now known as MPLS.

The debate also made for memorable marketing slogans, such as Bay Networks' "Switch when you can, route when you must."

But crafty slogans weren't enough to keep the market from moving to Cisco. Because of its ability to meld de facto standard routing with LAN switching, deft marketing and a bit of a price compromise, Cisco was able to lock up the Layer 3 switching market to complement its dominance in routers.

Bay, 3Com and Cabletron put up a valiant fight but in the ensuing years, these companies vanished or were marginalized as bit players in enterprise networking.
Jim Duffy

Fat WLAN access points vs. thin WLAN access points

This is one argument that was decisively ended. And then started up again.

Historically, wireless LANs (WLAN) relied on "fat" access points, which handled a wide array of tasks in software, each a separate IP address wired directly into Ethernet switches. All that changed around 2001 with the introduction of the WLAN switch (usually now called a controller) from start-ups such as Airespace, Aruba Wireless Networks and Trapeze Networks. Most of the access point's functions were shifted to the controller, which incorporated the Ethernet switch. The argument: centralize management, security administration, client handoffs and more. That argument seemed over when Cisco paid almost half a billion dollars to acquire Airespace.

But during the past 12 months, WLAN vendors such as Trapeze have been offloading jobs like data forwarding from the controller back to the access points. The new argument: less load on the controller, no single point of network failure, and reduced network latency and jitter.

In May 2007 a brand new start-up, Aerohive bet the farm on a more radical version of this idea. Areohive distributes all of the controller functions through a mesh of intelligent access points, each with its own IP address. They work cooperatively to do the task formerly done by a separate controller. Aerohive won't dethrone Cisco in the WLAN space anytime soon, but it suggests renewed efforts to distribute specifically wireless intelligence more pervasively through the network.
John Cox

Join the PC World newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Network World staff

Network World
Show Comments

Essentials

Lexar® JumpDrive® S57 USB 3.0 flash drive

Learn more >

Microsoft L5V-00027 Sculpt Ergonomic Keyboard Desktop

Learn more >

Mobile

Lexar® JumpDrive® S45 USB 3.0 flash drive 

Learn more >

Exec

Lexar® Professional 1800x microSDHC™/microSDXC™ UHS-II cards 

Learn more >

Lexar® JumpDrive® C20c USB Type-C flash drive 

Learn more >

HD Pan/Tilt Wi-Fi Camera with Night Vision NC450

Learn more >

Audio-Technica ATH-ANC70 Noise Cancelling Headphones

Learn more >

Budget

Back To Business Guide

Click for more ›

Most Popular Reviews

Latest News Articles

Resources

PCW Evaluation Team

Michael Hargreaves

Windows 10 for Business / Dell XPS

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?