Virtual Extensible LAN

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Virtual Extensible LAN (VXLAN) is a network virtualization technology that attempts to ameliorate the scalability problems associated with large cloud computing deployments. It uses a VLAN-like encapsulation technique to encapsulate MAC-based OSI layer 2 Ethernet frames within layer 4 UDP packets.[1]

VXLAN is an evolution of efforts to standardize on an overlay encapsulation protocol. It increases scalability up to 16 million logical networks and allows for layer 2 adjacency across IP networks. Multicast or unicast with HER (Head-End Replication)[2] is used to flood BUM traffic (Broadcast, Unknown destination address, Multicast).

The VXLAN specification was originally created by VMware, Arista Networks and Cisco.[3][4] Other backers of the VXLAN technology include Broadcom, Citrix, Pica8, Cumulus Networks, Dell, Mellanox,[5] OpenBSD,[6] Red Hat[7] and Juniper Networks.

The VXLAN was officially documented by the IETF in RFC 7348.

Open vSwitch supports VXLAN overlay networks.

See also[edit]


  1. ^ Steve Herrod (August 30, 2011). "Towards Virtualized Networking for the Cloud". VMware. Retrieved 2013-02-25. 
  2. ^ "Arista Expands Leaf Switch Product Portfolio" (Press release). Arista Networks. 22 October 2014. Retrieved 8 November 2014. Arista’s updated VXLAN implementation eliminates the need for multicast in the underlay network by using Head End Replication for forwarding broadcast, multicast and unknown unicast traffic 
  3. ^ Timothy Prickett Morgan (30 August 2011). "VMware, Cisco stretch virtual LANs across the heavens". The Register. Retrieved 2013-02-25. 
  4. ^ "Arista and VMware have coauthored a new standard in cloud networking: the Virtual eXtensible LAN (VXLAN)". Retrieved 2013-12-01. 
  5. ^ Timothy Pricket Morgan (April 23, 2013). "Mellanox adds VM-flitting to ConnectX-3 adapters - Going Pro with VXLAN". The Register. 
  6. ^ Reyk Floeter (October 14, 2013). "OpenBSD vxlan implementation". Reyk Floeter. 
  7. ^ M. Mahalingam et al. (February 22, 2013). "VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks". Retrieved 2013-02-25. 

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