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.


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 to find the geo tag values of various ASes.

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