RE: [v6ops] draft-ietf-6man-grand : saving lookups
"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Mon, 17 August 2020 14:09 UTC
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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
CC: IPv6 List <ipv6@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>
Subject: RE: [v6ops] draft-ietf-6man-grand : saving lookups
Thread-Topic: [v6ops] draft-ietf-6man-grand : saving lookups
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Date: Mon, 17 Aug 2020 14:08:58 +0000
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Hi Pascal, See below for inlines: From: Pascal Thubert (pthubert) [mailto:pthubert@cisco.com] Sent: Monday, August 17, 2020 2:39 AM To: Templin (US), Fred L <Fred.L.Templin@boeing.com> Cc: IPv6 List <ipv6@ietf.org>; v6ops@ietf.org Subject: [EXTERNAL] RE: [v6ops] draft-ietf-6man-grand : saving lookups Hello Fred: 100% agree. If the size of the multicast table is roughly that of the routing table, it looks particularly inefficient to maintain a multicast table for the sole purpose of DAD and lookup. We take great care in hiding that simple truth under the carpet by saying that’s a L2 problem. But it does not seem that L2 has taken the bait, has it. It depends on the L2. If the L2 is a physical media like a fabric of Ethernet switches then penetration down to L2 may not be happening. But, if the L2 is a virtual topology that is manifested by encapsulation (e.g., and overlay) then the point may be moot. As another case of what you’re describing, fabrics are optimized to use a routing protocol (e.g., BGP with eVPN) and broadcast is the last resort, but there is no multicast in between. Sadly it is still there, because the fabric is lacking a clear view of what’s there. Note also that the routing protocol is better suited to announce reachability than to perform DAD. This is where some help from the host would be needed in place of the useless IGMP games. The host can help the fabric by providing accurate information on the addresses it is effectively using, a sense of duration, a sense of order in movements, and a proof of ownership. This information should be enough to differentiate a case of multihoming / anycast with a movement. You seem to be assuming that the end system is a host that does SLAAC. I am assuming an end system model that does link-local-only with unique LLAs where no SLAAC nor DAD are necessary. Thanks – Fred All the best Pascal On Aug 11, 2020, at 12:48 PM, Templin (US), Fred L <Fred.L.Templin@boeing.com<mailto:Fred.L.Templin@boeing.com>> wrote: That is more or less the principle for NBMA, yes. But take a conservatively-sized NBMA link with 1M nodes on the link but only 2-3 of them need to receive the multicast then serially unicasting seems pretty efficient and does not disturb the vast majority of nodes that don’t care.
- I-D Action: draft-ietf-6man-grand-01 - additional… Vasilenko Eduard
- Re: I-D Action: draft-ietf-6man-grand-01 - additi… Jen Linkova
- RE: I-D Action: draft-ietf-6man-grand-01 - additi… Vasilenko Eduard
- Re: I-D Action: draft-ietf-6man-grand-01 - additi… Jen Linkova
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Nick Hilliard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Lorenzo Colitti
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Nick Hilliard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … joel jaeggli
- RE: I-D Action: draft-ietf-6man-grand-01 - additi… Vasilenko Eduard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Pascal Thubert (pthubert)
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Owen DeLong
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- RE: [EXTERNAL] Re: [v6ops] I-D Action: draft-ietf… Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Bob Hinden
- Improving ND security Ted Lemon
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [EXTERNAL] Improving ND security Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Tony Finch
- draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: Improving ND security Ted Lemon
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [EXTERNAL] Improving ND security Ted Lemon
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Ted Lemon
- RE: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Improving ND security Fernando Gont
- Re: [v6ops] [EXTERNAL] Improving ND security Bjoern A. Zeeb
- RE: [v6ops] [EXTERNAL] Improving ND security Templin (US), Fred L
- RE: [v6ops] Improving ND security Templin (US), Fred L
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [v6ops] [EXTERNAL] Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Owen DeLong
- Re: [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Philip Homburg
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Christian Huitema
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Templin (US), Fred L
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Michael Richardson
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Michael Richardson
- Re: [EXTERNAL] Re: [v6ops] I-D Action: draft-ietf… Michael Richardson
- Re: [EXTERNAL] Improving ND security Michael Richardson
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Pascal Thubert (pthubert)
- RE: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Vasilenko Eduard
- Re: [v6ops] I-D Action: draft-ietf-6man-grand-01 … Mark Smith
- RE: [EXTERNAL] Improving ND security Templin (US), Fred L
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Fernando Gont
- Re: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Pascal Thubert (pthubert)
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- RE: [v6ops] [EXTERNAL] Re: Improving ND security Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Mark Smith
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- distributed vs centralized approaches to ND secur… Michael Richardson
- Re: distributed vs centralized approaches to ND s… Nick Hilliard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Mark Smith
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Vasilenko Eduard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Nick Hilliard
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Bob Hinden
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Michael Richardson
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- RE: [EXTERNAL] Re: [v6ops] draft-ietf-6man-grand … Templin (US), Fred L
- Re: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Ted Lemon
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- RE: [EXTERNAL] Re: [v6ops] draft-ietf-6man-grand … Templin (US), Fred L
- Re: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Warren Kumari
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Templin (US), Fred L
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Manfredi (US), Albert E
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Fred Baker
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- RE: [EXTERNAL] [v6ops] draft-ietf-6man-grand : sa… Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Ted Lemon
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Jen Linkova
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Philip Homburg
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Lorenzo Colitti
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Gyan Mishra
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- RE: [v6ops] draft-ietf-6man-grand : saving lookups Templin (US), Fred L
- Re: [v6ops] draft-ietf-6man-grand : saving lookups Pascal Thubert (pthubert)