Quality of Service MPLS offers a range of QoS mechanisms that can be applied to the
EoMPLS service. The E-LSP model offers a scalable ???soft QoS??? mechanism suitable for
most services, whereas the L-LSP model offers the ???hard QoS??? required to guarantee
performance under all network conditions. The different QoS mechanisms offered by
MPLS may be offered simultaneously on the same network in order to offer a variety of
450 Chapter 14
SLAs to different customers. By layering services on MPLS LSPs, the EoMPLS model
also offers a means of aggregating QoS reservations through the network core.
Service Management EoMPLS relies on the well-understood and widely deployed IP
and MPLS tools for service management. These tools are already deployed in service
providers??™ IP/MPLS networks and are integrated into operational procedures. Where
existing tools have proven insufficient, new tools have been added (for example, VCCV
for pseudowire OAM). Because these tools have been standardised through IETF RFCs,
they are interoperable across multiple vendors??™ equipment. Services are provisioned
and managed from PE to PE, avoiding provisioning of customer circuits in core network
elements??”thus greatly simplifying network operations.
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