Internet Service Providers
There have been many advances in internet service provider (ISP) services over the last several years in terms of bandwidth, availability, and reliability. It is true that they do not offer a full service level agreement if you are crossing multiple Internet providers between a remote site and your data center, but it has become reliable enough to use in many situations.
From the chart you developed to define the prioritization of infrastructure components, identify sites that do not perform critical business functions and investigate moving these locations to an ISP connection. The costs will decrease and usually bandwidth will increase to provide quicker response times to the business at this location. For locations with two wide area network (WAN) connections installed in order to provide a more reliable service, consider moving one of these locations to an ISP connection. This will lower the overall cost for supporting each location. Also, set up routing so the business traffic will route over the existing WAN circuit and utility traffic will route over the ISP connection. Then you can route the business traffic over the ISP connection in the event of a failure of the WAN connection. However, since utility traffic is nonessential, you do not need to route it over the WAN connection in the event of a failure with the ISP connection. You will save the expense of upgrading the WAN connection to support all the utility traffic in the event of an ISP connection failure. Examples of utility traffic are software distribution, antivirus updates, and FTPs. You are also able to route Internet bound web traffic over the ISP connection. Routing this traffic over the ISP connection relieves congestion on the primary WAN link and provides better service for business traffic. Since the ISP connection provides higher bandwidth for lower costs, using this connection to support video applications is a more cost-effective solution than using the WAN service.
Bandwith
Users never have enough bandwidth. Complaints of slow response time will come in on a regular basis unless you have oversupplied locations with bandwidth, which is not advisable if you are trying to control costs. Ensure that locations are actually using the bandwidth provided for business traffic before making an upgrade. Bring in tools to provide the ability to analyze traffic at a location. Determine if users at this location are performing nonbusiness bandwidth-consuming functions, such as downloading MP3 songs or listening to streaming audio. If this is the case, have this traffic stopped by talking to management at the location and identifying the staff performing these functions. Taking the time to do this will help foster an environment where employees use computer resources only for business functions.
You can implement many products and services to stop employees from using the Internet for certain nonbusiness traffic. This is a preferable solution as it stops the downloading of MP3 songs, listening to streaming audio, etc. It saves personnel time in tracking down violators and prevents slower response times at a business site. However, this is not a cheap option. If funds are limited, spend the money on analysis tools because you need to know traffic patterns either way.
As a rule, you want to provide enough bandwidth capacity to support business requirements at a location. There may be sites or vendor price points that make oversubscription of bandwidth a good selection. If there are business-critical sites for your organization, then managing bandwidth too closely may cause a significant impact to the business that is not worth the savings. Spending more at these locations to provide extra capacity is worth the cost. The other decision in bandwidth management is looking at vendors' price points. Some WAN vendors have started providing full T1 Multiprotocol Label Switching (MPLS) connections at a lower price point than higher-speed fractional T1 connections.
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