Kireeti, > Hi Thomas, > > On Sep 28, 2012, at 6:09, Thomas Narten <[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.=20
At least in the context of L2-based CUG, as defined in draft-rekhter-nvo3-vm-mobility-issues, it is defined in terms of the service that it provides: Consider a set of VMs that (as a matter of policy) are allowed to communicate with each other, and a collection of devices that interconnect these VMs. If communication among any VMs in that set could be accomplished in such a way as to preserve MAC source and destination addresses in the Ethernet header of the packets exchanged among these VMs (as these packets traverse from their sources to their destinations), we will refer to such set of VMs as an Layer 2 based Closed User Group (L2-based CUG). Given that, would you say that there is no difference between an L2-based CUG and a VN ? Yakov. > > > 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 a= > nd CUG are the same, but stick to using one term, preferably VN.=20 > > Note that Wikipedia defines CUG as follows: > > Closed User Groups are groups of GSM mobile telephone subscribers who can on= > ly make calls and receive calls from members within the group. Any other cal= > ls would be rejected. > > The definition is pretty close, but it goes to show that CUG comes with over= > tones that may confuse people.=20 > > One refinement might be to define L2 and L3 VNs off the base definition of V= > N.=20 > > > Yakov Rekhter <[email protected]> writes: > >=20 > >> 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.=20 > > <rest snipped> > > Kireeti > > > --Apple-Mail-F4CA13A0-392E-49A4-8B68-13EF56C87F2F > Content-Transfer-Encoding: quoted-printable > Content-Type: text/html; > charset=utf-8 > > <html><head></head><body bgcolor=3D"#FFFFFF"><div>Hi Thomas,<br><br>On Sep 2= > 8, 2012, at 6:09, Thomas Narten <<a href=3D"mailto:[email protected]";>nar= > [email protected]</a>> wrote:<br><br></div><div></div><blockquote type=3D"ci= > te"><div><span>This discussion is interesting, but I still have not seen an a = > nswer to</span><br><span>the question: what is (or is there) a difference be= > tween a VN and an</span><br><span>CUG?</span><br></div></blockquote><div><br= > ></div>No difference. <div><br><blockquote type=3D"cite"><div><span>If t = > here is no difference, that would be great, because then we can</span><br><s= > pan>use the terms interchangably. If there are differences, we need to</span= > ><br><span>understand what those differences are, or there will be confusion= > in</span><br><span>our discussions.</span><br></div></blockquote><div><br><= > /div>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. <= > /div><div><br></div><div>Note that Wikipedia defines CUG as follows:</div><d= > iv><br></div><p style=3D"margin-top: 0.4em; margin-right: 0px; margin-bottom= > : 0.5em; margin-left: 0px; "><b>Closed User Groups</b> are groups of&nb= > sp;<a href=3D"http://en.wikipedia.org/wiki/GSM"; title=3D"GSM" style=3D"text-= > decoration: none; background-image: none; background-attachment: initial; ba= > ckground-origin: initial; background-clip: initial; background-color: initia= > l; ">GSM</a> <a href=3D"http://en.wikipedia.org/wiki/Mobile_telephone"; t = > itle=3D"Mobile telephone" class=3D"mw-redirect" style=3D"text-decoration: no= > ne; background-image: none; background-attachment: initial; background-origi= > n: initial; background-clip: initial; background-color: initial; ">mobile te= > lephone</a> subscribers who can only make calls and receive calls from m = > embers within the group. Any other calls would be rejected.</p><div><br></di= > v><div>The definition is pretty close, but it goes to show that CUG comes wi= > th overtones that may confuse people. </div><div><br></div><div>One ref= > inement might be to define L2 and L3 VNs off the base definition of VN. = > ;</div><div><br><blockquote type=3D"cite"><div><span>Yakov Rekhter <<a hr= > ef=3D"mailto:[email protected]";>[email protected]</a>> writes:</span><br>= > <span></span><br><blockquote type=3D"cite"><span>There is a definition of L2= > -based CUG in</span><br></blockquote><blockquote type=3D"cite"><span> draft-= > rekhter-nvo3-vm-mobility-issues</span></blockquote></div></blockquote><div><= > br></div><div>Thomas, the reference I gave below about where L2-CUG is defin= > ed is wrong -- not the EVPN draft, but the one above. </div><br></div><= > div><rest snipped></div><div><br></div><div>Kireeti</div><div><br></di= > v></body></html>= > > --Apple-Mail-F4CA13A0-392E-49A4-8B68-13EF56C87F2F-- > > --===============6522178728508190782== > Content-Type: text/plain; charset="us-ascii" > MIME-Version: 1.0 > Content-Transfer-Encoding: 7bit > Content-Disposition: inline > > _______________________________________________ > nvo3 mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/nvo3 > > --===============6522178728508190782==-- _______________________________________________ nvo3 mailing list [email protected] https://www.ietf.org/mailman/listinfo/nvo3
