The benefits of using BGP, or any other
routing protocol, for dynamic discovery of the pseudowires to signal at the interconnect
are twofold:
?– It reduces the manual configuration required per service.
?– It facilitates architectures with multiple redundant interconnects.
Large Numbers of Carrier-class Services Need to be Supported
Ethernet over MPLS enables providers to offer an immense number of service instances
over one common network and to provide carrier-class Service-Level Agreements (SLAs)
for those services. The reason an immense number of services may be offered is because
EoMPLS layers services onto MPLS LSPs, isolating the core of the network from any
knowledge of the services being carried over the network. Carrier-class SLAs may be
offered because EoMPLS typically runs on carrier-class nodes, supporting the node and
traffic protection mechanisms discussed in ???MPLS Protection,??? and supporting the QoS
mechanisms discussed in ???MPLS QoS.??? The ability of MPLS to offer differentiated QoS
enables service providers to offer their customers a range of tiered SLAs.
Carriers Wish to Backhaul Residential Broadband Traffic
Early residential broadband deployments used ATM backhaul; however; as DSLAMs
and OLTs now provide Gigabit Ethernet uplinks; providers are migrating to Ethernet
backhaul.
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