On 03/03/2026 11:59, James Bensley wrote: Excellent and useful feedback! Thanks, Hank
Hi Hank,
It is possible for routes to get stuck in the global routing table, although it is pretty rare.
The is a project called the BGP Clock, they announce prefixes, then withdraw them, and then check if they are still visible anywhere, to see if the prefixes are "stuck". It's called the BGP Clock because they encode the time in the IPv6 prefix, so each prefix is unique and you can see when it was announced (and thus how long it's been lingering in the DFZ).
F5s ASN in one that shows as potentially having this problem according to this tool: https://www.thousandeyes.com/bgp-stuck-route-observatory/?asn=35280
Note that this can't be taken as any sort of guarantee and this is just a "hint" because there are many variables at play.
I actually don't know what the "OBSERVED PATHS" is showing here, 35280 doesn't appear in any of them, so are they the paths "up to" 35280 ?
With kind regards, James.