Virtual Extensible LAN (VXLAN)

vxlan

  • VXLAN is a L2 over L3 solution
  • The benefits include:
    • The easy extension of Layer 2 segments across physical locations
    • 16 million layer 2 segments supported thanks to a 24 bit VXLAN network identifier (VNID)
    • Instead of STP, layer 3 Equal Cost Multi Pathing (ECMP) can be used
  • VXLAN is a MAC-in-UDP solution
  • VXLAN Tunnel Endpoints (VTEP) are used for the encapsulation and deencapsulation
  • Stateless tunnels between VTEPs move traffic
  • Multicast is used to reduce flooding scope
  • VLAN to VXLAN translation can be provided by VTEPs acting as VXLAN Gateways

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