Direct Mode Topology

Direct Mode Topology An architecture diagram generated by Archify. Pod A · 192.168.1.5 · Node 1 (10.0.1.10) Pod A 192.168.1.5 Routing Table · BGP-learned routes · Node 1 (10.0.1.10) Routing Table BGP-learned routes eth0 · 10.0.1.10 · Node 1 (10.0.1.10) eth0 10.0.1.10 Router / ToR Switch · BGP peer · Network infrastructure Router / ToR Switch BGP peer eth0 · 10.0.1.11 · Node 2 (10.0.1.11) eth0 10.0.1.11 Routing Table · Local pod routes · Node 2 (10.0.1.11) Routing Table Local pod routes Pod B · 192.168.1.70 · Node 2 (10.0.1.11) Pod B 192.168.1.70 Native IP BGP Route BGP Route Node 1 (10.0.1.10) Network infrastructure Node 2 (10.0.1.11) Legend Frontend Pod / node routing table Database Node NIC (eth0) Security Message bus BGP peer (router / ToR switch)

Requirements for Direct mode

  • • BGP routing: external routers learn pod routes via BGP
  • • L2 adjacency or L3 routing between nodes
  • • Route propagation: the physical network routes pod CIDRs

Packet characteristics

  • • No encapsulation — pod IPs are routed natively
  • • 0 bytes overhead, MTU stays 1500
  • • ipipMode: Never / vxlanMode: Never