A Well-known BGP community will be better.

You'll need to rewrite next hop or do something similar if AnyCast prefixes are learnt from a multi hop BGP feed, and it made the configuration more complicated and difficult to debug.

On Wed, Mar 20, 2019, 01:48 Fredy Kuenzler <kuenzler@init7.net> wrote:
Am 19.03.19 um 18:39 schrieb Bill Woodcock:
>> On Mar 19, 2019, at 10:12 AM, Fredy Kuenzler <kuenzler@init7.net>
>> wrote: I wonder whether anyone has ever compiled a list of
>> well-known Anycast prefixes.
>
> I don’t know of one.
>
> It seems like a good idea.
>
> BGP-multi-hop might be a reasonable way to collect them.
>
> If others agree that it’s a good idea, and it’s not stepping on
> anyone’s toes, PCH would be happy to host/coordinate.

Thanks for the effort, much appreciated.

Am 19.03.19 um 18:40 schrieb Joe Provo:
> I think one would want that internal and no rely upon someone else
> maintaining it.  You might check if Oracle followed up on the
> Renesys/Dyn work documented:
> https://dyn.com/wp-content/uploads/2014/07/NANOG59_Anycast.pdf
>
> ...where there were ~600 anycast v4 prefixes at the time.

That's a lot %-]

Maybe a well-known community (similar to RFC7999) could be defined and
every Anycast operator could tag his prefixes? That's likely a better
idea than manually maintain some list somewhere.

--
Fredy Kuenzler

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