Full-Mesh BGP (5 Nodes)

Full-Mesh BGP (5 Nodes) A sequence diagram generated by Archify. iBGP session 1/10 iBGP session 2/10 iBGP session 3/10 iBGP session 4/10 iBGP session 5/10 iBGP session 6/10 iBGP session 7/10 iBGP session 8/10 iBGP session 9/10 iBGP session 10/10 Node 1 → the other 4 nodes (4 sessions) Node 2 → 3 remaining nodes (3 sessions) Node 3 → 2 remaining nodes (2 sessions) Node 4 → Node 5 (1 session) · total 4+3+2+1 = 10 Node 1 · AS 64512 · Sequence participant Node 1 AS 64512 Node 2 · AS 64512 · Sequence participant Node 2 AS 64512 Node 3 · AS 64512 · Sequence participant Node 3 AS 64512 Node 4 · AS 64512 · Sequence participant Node 4 AS 64512 Node 5 · AS 64512 · Sequence participant Node 5 AS 64512 Legend iBGP session (direct peering between a node pair)

Full-mesh BGP sessions = N × (N-1) / 2

  • • 5 nodes → 10 sessions, 10 nodes → 45 sessions (fine)
  • • 50 nodes → 1,225 sessions, 100 nodes → 4,950 sessions
  • • Route Reflectors are recommended at 50+ nodes
  • • Top-to-bottom order only enumerates the sessions; it does not imply establishment order