Networks / Telecoms
the bandwidth estimates to build up 4. Implementing regional instances of MPLS and internet VPN connections
confidence in the calculations. the application. This reduces the and route different applications over
distance that transactions have to different networks, but the cost saving
Step 2 - Validating the architecture travel but it can be complicated and from cheaper internet bandwidth has
Web applications typically require expensive to implement. to be traded off against the additional
multiple round-trips per transaction cost of supporting two networks.
and this can have a significant impact Step 3 - Selecting the network
on performance. Increasing the For guaranteed performance and The cost of each option will depend on
bandwidth available will only improve service levels, most companies would the service provider and locations, but
the performance up to a point because normally deliver global applications in the case of SABMiller our analysis
of the effect of network latency. The using a private (MPLS) network. indicates that the cost over 3-5 years
way the applications are implemented However such networks become from using a hybrid of both MPLS and
is critical in order for them to perform expensive as the bandwidth increases internet VPN connections is
when scaled globally. and there is an opportunity to significantly cheaper than routing all
The performance of global applications significantly reduce network costs by the traffic over an equivalent MPLS
can be optimised in several ways, for using internet VPNs. However the network. Their data centres and most
example: potential saving has to be traded off of the local Business Units already
1. Optimising the applications and the against the potential service level have large internet connections so
content for performance. Ensure the impact. migrating traffic for specific
applications are architected for applications (e.g. email) onto internet
performance and get the right balance MPLS networks enable service VPN connections will enable them to
between richness of the content and providers to offer guaranteed service utilise the available bandwidth and
speed of delivery. levels for performance and reliability as significantly reduce their network costs.
2. Using WAN optimisation and well as Quality of Service (QoS) Using a hybrid network will also enable
accelerator technologies to prioritise functionality to prioritise traffic. Internet them to deploy business-critical
and compress network traffic and pre- VPNs use encryption technology to transactional applications on the
distribute content to local content create virtual tunnels between existing MPLS network.
caches. communication nodes attached to the
3. Using Citrix (or Terminal Services). public internet. They cannot provide After completing the study, Xantus is
Transaction round-trips will then occur guaranteed service levels, but the now implementing a pilot of new
within the data centre and this equivalent bandwidth can be internet VPNs for email in the first
improves performance, but it is significantly cheaper if users can live Business Units and implementing WAN
expensive to scale to a large numbers with the variable performance. It is also accelerator and caching technology to
of users. possible to use a combination of both optimise application performance.
September 2008
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