CUG term has been used since the days of X.25. To me CUG only represents entities/users that are on the network (i.e. VN), not the network or a set of connections making the virtual network. On the other hand, VN represents the network or a set of connections making the virtual network, but not the users on the network.
Mehmet From: [email protected] [mailto:[email protected]] On Behalf Of Kireeti Kompella Sent: Friday, September 28, 2012 9:36 AM To: Thomas Narten Cc: [email protected] Subject: Re: [nvo3] What is CUG model was RE: Push or pull? Hi Thomas, On Sep 28, 2012, at 6:09, Thomas Narten <[email protected]<mailto:[email protected]>> wrote: This discussion is interesting, but I still have not seen an answer to the question: what is (or is there) a difference between a VN and an CUG? No difference. If there is no difference, that would be great, because then we can use the terms interchangably. If there are differences, we need to understand what those differences are, or there will be confusion in our discussions. For clarity, we should define VN in some draft (framework?), state that VN and CUG are the same, but stick to using one term, preferably VN. Note that Wikipedia defines CUG as follows: Closed User Groups are groups of GSM<http://en.wikipedia.org/wiki/GSM> mobile telephone<http://en.wikipedia.org/wiki/Mobile_telephone> subscribers who can only make calls and receive calls from members within the group. Any other calls would be rejected. The definition is pretty close, but it goes to show that CUG comes with overtones that may confuse people. One refinement might be to define L2 and L3 VNs off the base definition of VN. Yakov Rekhter <[email protected]<mailto:[email protected]>> writes: There is a definition of L2-based CUG in draft-rekhter-nvo3-vm-mobility-issues Thomas, the reference I gave below about where L2-CUG is defined is wrong -- not the EVPN draft, but the one above. <rest snipped> Kireeti
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