Face-off: Users do not need application-aware networks
Balance demands for SOA with other enterprise network initiatives, such as data replication, VoIP and LAN extension.
By Raghu Ranganathan
,
Network World
, 04/17/2006
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The emerging service-oriented architecture is introducing better ways to integrate business processes, and business managers
are demanding SOA-based applications. These demands for SOA must be balanced with other enterprise network initiatives such as data replication,
VoIP and LAN extension. The WAN implications of these emerging applications are profound: exponential increases in traffic volume, more sensitivity to network latency, less-predictable traffic patterns
and increasing difficulty in identifying high-priority traffic.
In such an environment, there is value in load balancing and prioritizing application flows. Application awareness and control
belongs at the edge of the LAN, however, not in core network elements. Higher-layer functions best reside on servers and ancillary
equipment that are tightly bound to supported applications.
In an on-demand IT world where the performance of critical applications is becoming increasingly more strategic, building
application awareness into WANs is a fundamentally flawed approach. Consider these issues:
- The unnecessary bind. Coupling ever-evolving applications with stable network elements doesn't make economic or operational sense. In grafting
the added hardware and software necessary for application awareness onto WAN equipment, users will experience cost and performance
penalties as they attempt to optimize WAN architectures based on packet inspection, which potentially increases latency and
diminishes throughput for SOA and other enterprise applications.
- Business flexibility. Pairing network elements and applications hinders organizations from adapting quickly to their fast-changing IT needs. If
applications are inextricably linked to WAN elements, IT systems and networks struggle to react swiftly and organizations
lose their agility.
- Operational complexity and cost. Application awareness complicates an IT group's ability to ensure applications are responding to user needs. By taking on
tasks traditionally supported by servers and middleware, application-aware elements add to the operational expense of a WAN.
By contrast, an application-transparent network optimizes bandwidth and switches traffic at the lowest possible layer - leveraging
new, flexible optical transport and Ethernet data-switching technologies. This enables the cost-effective creation of networks
that provide maximum throughput, inherent security and the lowest latency for each application. Lower-layer, application-transparent
networks are very reliable, don't drop packets and deliver a deterministic response. They are scalable and ideal for high-bandwidth,
time-sensitive, mission-critical business processes.
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