Luigi made this suggestion at the working group. You cannot use site-id because all the L2 sites are part of the same L2 network need the same value. And instance-ID is the only value that can be used since it is in the encapsulated header. You need to use instance-ID so multi-tenancy can be used. Because each site can be part of multiple VLANs which may partially reside in other sites (i.e. site-id A has VLANS (1,2,3), but site-id B has VLANS (1,2) and site-id C has VLANs (1,3))
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