One of the things I've been meaning to clarify here is what is the
defintion of a CUG?

In offlist discussions I've had, I've come to the conclusion that a
CUG is the same thing as a VN. That is, it's a set of machine that are
administratively placed into a group and are allowed to communicate
with each other, but not with others outside of that CUG.

Correct?

And,  RFC 4364 says:

>    Suppose it is desired to create a fully meshed closed user group,
>    i.e., a set of sites where each can send traffic directly to the
>    other, but traffic cannot be sent to or received from other sites.
>    Then each site is associated with a VRF, a single Route Target
>    attribute is chosen, that Route Target is assigned to each VRF as
>    both the Import Target and the Export Target, and that Route Target
>    is not assigned to any other VRFs as either the Import Target or the
>    Export Target.

Is there another (different?) definition of CUG?

Thomas

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