[Snac] On advertising Prefixes
"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 25 July 2022 17:41 UTC
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Ted Lemon <mellon@fugue.com>
CC: "snac@ietf.org" <snac@ietf.org>, Stuart Cheshire <cheshire=40apple.com@dmarc.ietf.org>
Thread-Topic: On advertising Prefixes
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Subject: [Snac] On advertising Prefixes
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Hello Ted ; Following up on the great discussion at SNAC, several things: The way the 6LO/ROLL solution typically works is route when you can and proxy ND for legacy. Nodes typically register their addresses using RFC 8505. The router that gets the registration does what's necessary, that is inject in routing or proxy ND, but the client does not need to know. At IETF 113 we discussed extending the registration to prefixes, so a node that has a prefix "inside == could be a stub" can register it to other routers, again agnostic of the routing protocol that the other routers use with the rest of the internet, see slides at https://datatracker.ietf.org/doc/slides-113-6lo-announcing-prefixes/. Should I suggest that at SNAC in London? Note that the way 6lo scales the backbone is through an abstract 6LBR and an agnostic ND unicast exchange with that 6LBR. That 6LBR can be distributed in all routers using BGP in the case of EVPN https://datatracker.ietf.org/doc/slides-113-6lo-draft-thubert-bess-secure-evpn-mac-signaling-pdf/; it can be a classical broadcast domain where some legacy nodes can still connect (RFC 8929 or is can be a central registrar (https://datatracker.ietf.org/doc/slides-113-6lo-draft-thubert-6lo-unicast-lookup-pdf/). So the situation has evolved though a lot of it is WIP. All the best, Pascal
- [Snac] On advertising Prefixes Pascal Thubert (pthubert)