It may be time to examine the state of your LAN

LANs were supposed to be easy by now. The near-universal convergence on unshielded twisted-pair (UTP) wiring of Ethernet LANs, TCP/IP stacks and Web browsers was supposed to end the turf wars and headaches of dealing with networks of mixed cabling, mixed topologies and mixed protocols.

The LAN infrastructure, we were told, would become like a data utility. You’d think about it as little as you think about the electric socket next to your desk. Well, maybe next year.

For now, the campus LAN rightfully remains a focal point of the infrastructure development effort. For every technology choice eliminated in the past few years, it seems like two more have sprung up in its place. With a three- to five-year time span needed to “remodel” the campus LAN, a wrong decision can remain an albatross for a long time. A technology choice made in haste can be your undoing, and the road not taken could rob your company of a significant competitive edge.

As we gear up for this spring’s Tolly Group/Network World State of the LAN Town Meeting tour, I’ve been making my list of crucial technology issues. Examine the state of your LAN and see how your issues stack up against mine.

Here are a few things on my mind:

_ Packetized voice, the “un-PBX” and quality of service (QoS). The telephony steamroller is slowly but surely heading your way. The upheaval of dealing with a radically different LAN application and the migration of black-box PBXs to distributed LAN systems will have a big impact on the campus LAN. With the arrival of voice, QoS will move from an academic topic to an essential element. The presence of big bandwidth can’t simply erase all our QoS concerns.

_ Switches.

No longer are these

essential pieces of infrastructure easily classified by noting the Open Systems

Interconnection layer where they process traffic. With the emergence of load-balancing “Web switches” and vendors that claim to be able to process traffic

at every layer from 4 to 7, we become almost paralyzed by the switch selection process.

And what else should a switch do? Should it also be a Web cache, a content filter, a firewall and a virtual private network server? They’re all out there.

_ Wondering about wiring. The toughest decision of all is with regard to wiring. Sure, Category 5 UTP is safe, but is it right? Gigabit-over-copper products are rolling out at an increasing pace. And new systems built around Cat 5e and 6 UTP have shown they can do the job.

But copper will never be able to match fiber when it comes to extended distances – and how far is far enough? There are claims that new fibre technology makes fibre to the desktop the best way to go.

Tolly is president of The Tolly Group, a strategic consulting and independent testing company in Manasquan, New Jersey. He can be reached at

[email protected]



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