Ethernet Segments
When a customer site is connected to one
or more Provider Edge (PE) routers via a set of Ethernet links, this set of links
constitutes an Ethernet segment (ES).
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For a multihomed site, each Ethernet segment (ES) is identified by a unique, non-zero identifier called an Ethernet Segment Identifier (ESI). All-Active multihoming over an ES allows full utilization of all Customer Edge (CE) to PE links for traffic to and from that CE.
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