Law Firm Relies On Traffic Shaping For Wan Performance

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A project to consolidate servers in a central data centre highlighted the need for international law firm Reed Smith to use traffic-shaping technology to ensure that its most important applications perform well on its now-critical WAN.

So far Reed Smith has used Packeteer PacketShapers to prioritise key flows, limit or block unnecessary traffic and adjust the size of its WAN links to make the network as cost-effective as possible, says Frank Hervert, senior manager of network and messaging services for the firm.

He doesn't have a quantified return on investment, but the Packeteer appliances enable him to cost-justify increases or decreases in bandwidth, so the firm doesn't pay for bandwidth it doesn't use. "Over a six-month term that will easily save me money beyond the cost of the PacketShaper," he says.

The equipment also provides monitoring and records that enable Reed Smith to double-check carrier services and ensure that service providers meet service-level agreements and configure the network in accordance with its design, he says.

The Pittsburgh-based law firm has 15 offices in the US and six offices overseas. Each used to have its own Internet access and servers, but for the past two years, the firm has been consolidating its servers and Internet access at a leased secure data centre.

The centralisation is about 60 percent complete for the US offices, Hervert says. In June, the firm plans to switch its foreign offices to a new European data centre based on the same model.

Centralised apps

The US data centre contains 180 Citrix servers that host the law firm's key applications, including common office applications such as Word, Excel, PowerPoint and e-mail. "All of that processing is centralised out...

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...olicies the firm sets, for example, if an office generates more than 75 percent of total traffic the Packeteer devices send an alert.

Or if a particular application generates traffic outside the norm, the gear automatically creates a separate traffic class for it. The new class jumps out when Hervert reviews routine network performance reports, he says. The gear also generates an e-mail about the spike in traffic.

The firm does not take advantage of Packeteer's ability to compress traffic across WAN links. So far, there is enough bandwidth to keep performance high without it, says Hervret. The goal is to get the Citrix traffic and voice traffic among offices running well, then add IP video to the mix over time, he says.

"The PacketShape is our view, our measurement of what's there, of what's behaving on the network and what we can add to it," Hervert says.

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