Riverstone Networks 7450 - Manual (Page 4)

Ethernet virtual private networks
(VPNs) complete the service provider
service mix — ensuring that they can
confidently mix and match Layer 2 and
Layer 3 VPN services based on what
their customers want. VPLS expands
the next-generation VPN service market
and enables service providers to offer
their customers a Layer 2 multipoint
service that provides higher bandwidth
than frame relay, with the same QoS as
frame relay or ATM. Also, unlike IP-
VPNs, which require the enterprise to
share routing information, VPLS allows
the enterprise to retain routing control
and provides the flexibility to support
multiple protocols, in addition to IP,
that are present in many enterprise
networks.
With a next-generation VPLS imple-
mentation, service providers can tailor
service definitions that directly align
with the customers’ business objectives
and thereby create value. The Alcatel-
Lucent 7450 ESS delivers VPLS today
with the ability to have different
applications run within a single VPLS
service with distinct service level agree-
ments (SLAs), as well as an aggregate
SLA for each customer. This greater
degree of control for service level
differentiation is delivered through
an extensive QoS implementation,
including hierarchical QoS (H-QoS)
as illustrated in Figure 2.
4 Alcatel-Lucent 7450 Ethernet Service Switch
Figure 2. Enhanced QoS Options for User-Centric Services
Voice
Enterprise
Video VPLS Service
7450 ESS
Multi-Application SLA
Multiservice SLA
Tailored VPLS Service
Converged Ethernet Service
Internet Access Business-Critical Apps
Standard Applications