[In the context of the anycast community at-mic discussion during IETF-114]

Grow WG,

As part of the RFC process for Large BGP Communities, there was strong
objection to having any large communities set aside for special purposes.  

As a result of this, there are no designated ASes that are part of the
rather large deployment of BGP code that understands these communities for
"magic numbers" that is typical of various implementations for well known
communities.

While there has been a few attempts to start discussion about designating
well known large communities, the above point means there is a fair amount
of resistance to the idea and inertia to overcome in IDR.

Extended Communities, if they can hold the data in question, are effectively
free.  Feel free to grab them at whim!

-- Jeff (speaking partially as IDR chair and minimally as an IDR historian)

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