Maintaining MPLS VPN service consistency has emerged as a major issue for companies employing multiple carriers for global reach. Nexagent is a 5-year-old company based in the U.K. that develops hardware and software designed to link carrier networks. CEO and founder Charlie Muirhead recently spoke with Network World Managing Editor Jim Duffy.

Is MPLS VPN service consistency a big concern among corporations?

The challenge is connecting networks in a scalable and reliable way while ensuring that you can extend the rich service model from one network to another rather than diluting it down to the lowest common denominator services. How do you solve this from an operational and process standpoint? There's a whole bunch of choices available to them.

Historically, enterprises pretty much built the solutions themselves. They would buy bandwidth from many carriers. That was a big task. Along comes the world of VPNs and the large international carriers would turn around and say, 'If you want consistency and [service-level agreements], you have to give it all to me, on-net.' That jarred some customers who played their bandwidth suppliers off of each other to keep them keen on price and quality. So these global enterprises find themselves in an interesting position: Do they go to a single global carrier knowing that that carrier doesn't have the network in all the countries, and somewhere under the hood there's an activity going on which is really network integration? The default is to continue doing it yourself. That means buying MPLS services from different carriers around the world and integrating those. The third option is to go straight to a systems integrator who historically would essentially take over running your in-house [do-it-yourself] architecture with great scale of economy. Then you have the virtual network operators that are just beginning to emerge.

Sounds like a daunting problem for a company.

It is. The global enterprises have a lot of choices. There's pros and cons to each. They're always quite suspicious about the motivations of the global carriers because they're always trying to get your traffic onto their facilities so they get their margins. And they're always a bit suspicious about what's actually going on under the hood and where do they have network and where don't they. Most of the time you'll hear about carriers responding to bids with pricing for geographies they say they're going to have when it's not quite in place yet.