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SPB service falls between physical dedicated facilities and on-demand services Bandwidth cannot necessarily be changed in real time, and changing it may require manual intervention by the carrier Charging is usage-independent However, the service concept does include the concept of the customer requesting changes in bandwidth provisioning via an enhanced UNI, or, more likely, a customer-specific web interface into the provider s provisioning system Obviously, the ability to point and click to reprovision services would lower carriers internal provisioning expense SPB extends the equivalent functionality to the customer, but limited to the capabilities of physical facilities they have installed For example, if 1-Gbps Ethernet, of which the customer pays for 500 Mbps of bandwidth, serves the user, the user could use SPB procedures to change its bandwidth to 300 or 800 Mbps The user could not, however, use SPB to get 2 Gbps, since that is physically not available from the facilities
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Customer financial people absolutely hate paying for resources they are not using Sometimes this hatred leads to silly behavior, as when the costs of tracking resource use or creating on-demand resource provisioning is greater than the potential savings In other cases, the concern is warranted, and BOD has been defined to meet those cases BOD involves connections initiated by an edge (user device) and automatically implemented by the network A practical setup time goal should be well under 1 s, which implies that there is a permanent physical connection between the edge equipment and the service entry point Think of the conventional telephone call and you are quite close to describing the service Charging for BOD is based on connection time The
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actual charges can vary with such things as time of day, requested quality of service, and so forth Equipment using BOD needs to have enough intelligence to operate a UNI That means that for legacy equipment optical BOD is either not an option or requires an intermediate converter box BOD has different implications for traffic engineering than for virtual private lines, since the connections will last for less time (have a shorter holding time) than soft permanent connections in the SPB service BOD imposes more work on the network switching elements Just as with telephone calls, the service request might be denied if resources are not available A BOD service, however, may include a feature by which future service reservations can be made
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Current concepts of VPNs are that they are implemented as tunnels over some underlying transport, which can be IP or a sub-IP layer such as MPLS VLANs and LANE are usually considered outside the scope of VPNs, the key differentiator being that native VPN networks that are limited to a medium, but VPNs can go over any topology supported by IP The next distinction in VPNs is whether they are customer-provisioned or provider-provisioned The service provider may be completely unaware of a customer-operated VPN using, for example, IPSec tunnels Provider-provisioned VPNs (PPVPNs) use several models, including BGP/MPLS [RFC 2547], multiple virtual routers, and optical VPN There is also a specific concept of an optical VPN (OVPN) OPVN service creates a dedicated optical transmission system under the customer s control This system is a subset of the carrier s resources Only sophisticated users that understand optical networking may make effective use of OPVNs, but that market does include local and specialized carriers and very large content providers The carrier charges not for bandwidth usage, but for the resources for the time that they are committed to the customer The customer is expected to manage admission control and other traffic management; the service provider is not responsible for congestion OVPN customers certainly will have a view of the actual facilities in use, and may have awareness of backup resources
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