Why do ROV-ASes announce some invalid route?

Thu Nov 10 02:59:51 UTC 2022

Hello Job,
  Thank you very much for your reply! I got that no AS can actually filter all the invalids. Yet I was trying to figure out why we couldn't see reasonable amount of withdrawals from AS6939 about invalid prefixes, as they explained how they implement ROV (https://mailman.nanog.org/pipermail/nanog/2020-June/108309.html). Perhaps we need to learn their detailed implementations.
  Thank you very much!

Best wishes,
Sun Letong

在2022-11-08 00:11:24,Job Snijders<job at fastly.com>写道：
> Dear 孙乐童,
> 
> On Mon, Nov 07, 2022 at 08:40:57PM +0800, 孙乐童 wrote:
> > We learned from Cloudflare's https://isbgpsafeyet.com/ that some ASes
> > have deployed RPKI Origin Validation (ROV). However, we downloaded BGP
> > collection data from RouteViews and RipeRis platforms and found that
> > some ROV-ASes can announce some invalid routes. For example, from RIB
> > data at 2022-10-31 00:00:00, 13 out of 17 ASes which declared to
> > deploy ROV announced invalid routes, and we list the number of related
> > prefixes for each AS below.
> >
> > [snip]
> > 
> > As a comparison, we count the invalid routes the non-ROV ASes (also
> > declared in https://isbgpsafeyet.com/) announces, as below:
> > 
> > We can see that ROV ASes announced apparently fewer invalid routes
> > compared to the non-ROV ASes, though they did not filter all the
> > invalids. 
> >
> > [snip]
> > 
> > Can anyone help us to correctly interpret this case? Thank you very much.
> 
> You ask great questions! I hope an answer to your questions can be found
> in a message I sent a year ago:
> 
> 	https://mailman.nanog.org/pipermail/nanog/2021-April/213346.html
> 
> The summary: in any sufficiently large network, chances are not 100% of
> all equipment supports RPKI-based BGP Route Origin Validation; in such
> cases a handful of invalid routes may still percolate through the
> system. Another contributing factor might be certain types of software
> upgrades; where ROV temporarily is disabled on one or more devices. Or
> perhaps an ISP made a handful of exceptions for test/beacon invalid
> routes to propagate.
> 
> Kind regards,
> 
> Job 