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Re: Generic anycast addresses...

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 30 May 2019 23:48 UTC

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Subject: Re: Generic anycast addresses...
To: Ted Lemon <mellon@fugue.com>
Cc: Sander Steffann <sander@steffann.nl>, Michael Richardson <mcr+ietf@sandelman.ca>, "6man@ietf.org" <6man@ietf.org>, Dave Thaler <dthaler@microsoft.com>
References: <D22E680C-3EE3-4AD7-90C0-9339DA2E5A29@fugue.com> <BN6PR21MB04978DB375C05CB3CE4C914EA31F0@BN6PR21MB0497.namprd21.prod.outlook.com> <4EF97F31-1F39-4150-B044-955C46E96FB4@fugue.com> <20190530002833.wfvjfbj2lv2ig664@faui48f.informatik.uni-erlangen.de> <7A9560FC-0393-45DF-8389-B868455AC6DD@fugue.com> <20190530005734.7d2alod2zoaemmhc@faui48f.informatik.uni-erlangen.de> <D6E27B45-437F-45BE-A305-47DD460BCE02@fugue.com> <26144.1559226966@localhost> <1DD451A7-D898-4105-974C-53776A3DA9F2@fugue.com> <20190530152902.l2nmyhadr4e4kt7x@faui48f.informatik.uni-erlangen.de> <0FF19D6D-1A45-41EF-BE34-CC35B5E51E1E@steffann.nl> <D91629F6-73AC-4A80-80EF-16644F73DA36@fugue.com> <701687d4-842c-6a16-3c97-349125324e3f@gmail.com> <D648647D-60E1-4DCE-B0BE-11002E0AE5A4@fugue.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Fri, 31 May 2019 11:48:52 +1200
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On 31-May-19 09:59, Ted Lemon wrote:
> On May 30, 2019, at 2:19 PM, Brian E Carpenter <brian.e.carpenter@gmail.com <mailto:brian.e.carpenter@gmail.com>> wrote:
>> Ted, please do think about the main point: "the fuzzy nature of the site concept". (And, shameless plug, see https://tools.ietf.org/html/draft-carpenter-limited-domains). Limited scope anycast needs a non-fuzzy scope boundary.
> 
> Do ULAs have a non-fuzzy scope boundary?   Serious question—I actually do not know how this is handled in the network.

All we have is a strong recommendation to filter at site boundaries.

That site boundaries are ill-defined is of course part of my "limited domains" hobby horse.

   Brian

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