C5 VPLS and VPWS Service Summary and Metro Ethernet Architecture Overview 215
This section is specific to multipoint constructs. VPLS is designed for applications that
require multipoint or broadcast access. Using established VPLS, service providers can
create a Layer 2 “virtual switch” over an MPLS core to establish a distributed network
access point (NAP). The NAP permits transparent private peering between multiple
service providers (SPs) and delivers connections to multiple sites within a specific
metro region.
SP-to-SP VPLS can be supported using either Border Gateway Protocol (BGP) or Label
Distribution Protocol (LDP). LDP provides more granular ...
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