Hi Joel, > From what I can tell reading this, the value requires significantly more > precision than "region". As far as I can see, this document proposed a new aggregation parameter for IPFIX. So that the operators can get the traffic statistic from a new dimension. Because "Flow information based on IP address or IP prefix may provide much too fine granularity for a large network. On the contrary, flow information based on AS number may be too coarse." It sounds reasonable. Tianran > -----Original Message----- > From: Joel M. Halpern [mailto:joel@xxxxxxxxxxxxxxxx] > Sent: Monday, April 16, 2018 12:33 AM > To: heasley <heas@xxxxxxxxxxxxx>; li zhenqiang <li_zhenqiang@xxxxxxxxxxx> > Cc: rtg-dir@xxxxxxxx; gen-art@xxxxxxxx; > draft-ietf-opsawg-ipfix-bgp-community.all@xxxxxxxx; ietf@xxxxxxxx; opsawg > <opsawg@xxxxxxxx> > Subject: Re: Rtgdir early review of > draft-ietf-opsawg-ipfix-bgp-community-06 > > Thank you for that pointer. It is informative. > I looked at a number of the entries (trying to pick larger ISPs as more likely > to need more information.) What i see is some ISPs doing what Randy Bush > mentioned, marking regions. I see a few ISPs that explicitly mark country > (or in one case city). I see some that mix several pieces of information > including country in the same community, making it hard to perform what this > I-D calls for (not impossible, just harder). I do not see any indication > of wide-spread consistency. > > It appears that this is of use to a few ISPs. I have never argued that no > one wants this (the authors would not have written it if no one wanted it.) > > From what I can tell reading this, the value requires significantly more > precision than "region". > > Also, one of the arguments for doing this in the router is that you can get > more timely and precise correlation. Except that for geolocation of address > blocks, upstream correlation seems to be quite sufficiently stable and > precise. NLRI may come and go. I fone has geo-information, it is unlikely > to change. > > Yours, > Joel > > > On 4/15/18 12:09 PM, heasley wrote: > > Sun, Apr 15, 2018 at 02:52:43PM +0000, li zhenqiang: > >> Why do you think this is unusual and not common? > > > > Possibly, with due respect, because he is not an operator? While ASes > > often do so internally, not all reveal it externally or not > > ubiquitously. Browse https://onestep.net/communities/ to find the geo > tag values of various ASes. > >
