groups are connected by 2 planes in full mesh
", "time": "2023-11-07T14:58:32Z"}, {"author": "Eduard V", "text": "it is not DragonFly. It is Megafly
", "time": "2023-11-07T15:00:07Z"}, {"author": "Dmitry Afanasiev", "text": "There are 2 papers describing more or less the same topo - Dragonfly+ and Megafly. Dragonfly+ was first.
", "time": "2023-11-07T15:01:21Z"}, {"author": "Eduard V", "text": "Megafly is a very right approach. Fat Tree is better if possible (scale of centralized boxes).
", "time": "2023-11-07T15:02:31Z"}, {"author": "Dmitry Afanasiev", "text": "Dragonfly+ uses leaf-spine intra-group, original Dragonfly without + uses full mesh intra-group.
", "time": "2023-11-07T15:03:26Z"}, {"author": "Eduard V", "text": "Global links (between groups) must be always full mesh or performance would be very bad
", "time": "2023-11-07T15:04:14Z"}, {"author": "Eduard V", "text": "Many full meshed is even better - like on the picture.
", "time": "2023-11-07T15:04:37Z"}, {"author": "Eduard V", "text": "Actually, Megafly is not needed now. The best topology (Fat Tree in 3 hops) is scalable to 50k of servers/processors on the latest generation of switches/chipsets. No any full mesh in the middle with associated requirement for tactical traffic engineering, no any compromize to scale.
", "time": "2023-11-07T15:10:06Z"}, {"author": "Eduard V", "text": "Megafly scales 8x more but it is probably not needed yet.
", "time": "2023-11-07T15:11:03Z"}, {"author": "Eduard V", "text": "Sorry, my mistake: Megafy in 3 hops, Fat Tree in 4 hops.
", "time": "2023-11-07T15:13:10Z"}, {"author": "Eduard V", "text": "2 planes is too small. Modern switches permits to have up to 16.
", "time": "2023-11-07T15:14:01Z"}, {"author": "Pascal Thubert", "text": "RAW (now within DetNet) looks at using NECM based on OAM
", "time": "2023-11-07T15:16:23Z"}, {"author": "Eduard V", "text": "Replace full mesh by a big switch - then you do not need any traffic engineering (adapative routing).
", "time": "2023-11-07T15:16:44Z"}, {"author": "Dmitry Afanasiev", "text": "BGP essentially allows to implement missing logic via policies.
", "time": "2023-11-07T15:23:36Z"}, {"author": "Dmitry Afanasiev", "text": "Requires thinking carefully how updates are going to propagate.
", "time": "2023-11-07T15:25:22Z"}]