I do not understand the TRILL and PBB statement highlighted above. [Linda] They are all about ingress boundary node encapsulating another header (IP header, MPLS header, TRILL header, or MAC header) that consists of DA being the egress boundary node, SA being the ingress boundary node, and an additional "Instance ID" to further differentiate instances in the core (or underlay). The data frames to Ingress boundary node are Ethernet frames, and the decapsulated frames by egress nodes to attached hosts are Ethernet frames.
They can all be benefited by this "inner - outer mapping service" in the similar way. Nor do I see how "V" is orthogonal to anything we are discussing. [Linda] everything has a "V": VLAN, VPN, .... The mapping service can help them all.
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