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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 net-next 0/9] net: Generic network resolver backend
 and ILA resolver
Date: Mon, 11 Dec 2017 21:16:35 -0500 (EST)
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From: Tom Herbert <tom@quantonium.net>
Date: Mon, 11 Dec 2017 14:16:17 -0800

> How can we build a system that allows an unlimited number of
> resolutions without drop?

IPV4 routing solves this with a prefixed trie, for example.

The fundamental backing datastructure for the switching
or whatever operation must be in-memory, in the kernel,
scalable, and without a fronting "cache".