MESCAL
recognises the potential diversity of customer and service requirements
for Inter-domain QoS, ranging from residential to enterprise services,
from mission-critical to mass market applications. Consequently,
MESCAL has developed a range of solution options to match these
diverse requirements, with each option engineered to meet a perceived
demand.
The
Loose Guarantees solution option (LGSO) provides a highly scalable,
easily deployable approach to mass-market QoS services. The Loose
Guarantee option builds on a number of other MESCAL results – Meta-QoS-Class
and q-BGP – to provide end-to-end QoS suitable for a number of widely
used QoS-aware services. The limitation is that the QoS guarantees
cannot be as strict as in a highly engineered solution, as destination
address prefixes are not specified in the peering agreements.
The
Statistical Guarantees solution option (SGSO) provides greater control
over the end-to-end QoS by establishing QoS paths for specified
destination prefixes. Additionally, it is not restrained to providing
QoS that conforms to Meta-QoS-Classes as the Statistical Guarantee
option is able to combine the QoS classes of domains to meet any
end-to-end QoS requirement, while working within the cascaded peering
model.
The
Hard Guarantees solution option (HGSO) targets QoS-aware services
where strict performance guarantees are required, such as mission-critical
applications. The Hard Guarantee option establishes end-to-end MPLS
LSPs, each with dedicated resources, to provide the required QoS
guarantees. The solution option uses the MESCAL Path Computation
System (see below) to compute the inter-domain LSP.
Further
reading:
MESCAL
deliverable D1.3, "Final specification of protocols and algorithms
for inter-domain SLS management and traffic engineering for QoS-based
IP service delivery", Chapter 7. [link] |