Initial MS-PW implementations rely on static configuration of the S-PEs, though
there is work ongoing in the IETF to enable dynamic discovery of switching points (see
the section on ongoing developments below).
MPLS 443
VPLS
Multipoint Transparent LAN Services were offered by many service providers using
native Ethernet switching or using Ethernet over ATM before the advent of MPLS.
Following the adoption of Ethernet over MPLS using pseudowires for point-to-point
services, various vendors and service providers commenced standards work on multipoint
Ethernet over MPLS. These multipoint Ethernet services are an implementation
of the MEF E-LAN model.
Of the three groups that commenced work on multipoint Ethernet services in the
IETF, two selected LDP as their signalling protocol and the third selected BGP. The
two LDP groups merged, and industry consensus emerged for their proposal, which is
documented in RFC 4762. Both the LDP and BGP approaches came to be known as
Virtual Private LAN Services (VPLS).
There are two applications for VPLS:
?– Router interconnection In this application, a VPLS instance interconnects
multiple customer routers.
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