Re: Flow Tools AS-Path

["Dobbins, Roland via NANOG" <nanog () nanog org>]

On 4 Apr 2023, at 20:04, Mike Hammett <nanog () ics-il net<mailto:nanog () ics-il net>> wrote:

2) I have seen flow tools that show the entire AS path. Are they just cherry picking which platforms they showcase for 
the best marketing, or are they enriching the data they receive from "lesser" platforms from an outside source?

Full AS-path information isn’t typically included in flow telemetry records.  One typically receives origin-AS and 
destination-AS from exporting devices, along with BGP next-hop information.

Tools which provide the detailed type of information you’re describing typically provide combinatorial analysis of both 
flow telemetry received from edge routers and either live or offline BGP routing information.

[Full disclosure: I work for a vendor of such tools.]

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Roland Dobbins <roland.dobbins () netscout com<mailto:roland.dobbins () netscout com>>