Virtual Extensible LAN

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Virtual Extensible LAN (VXLAN) is a network virtualization technology that attempts to address 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, using 4789 as the default IANA-assigned destination UDP port number.[1] VXLAN endpoints, which terminate VXLAN tunnels and may be both virtual or physical switch ports, are known as VXLAN tunnel endpoints (VTEPs).[2][3][4]

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)[5] is used to flood BUM (broadcast, unknown destination address, multicast) traffic.

The VXLAN specification was originally created by VMware, Arista Networks and Cisco.[6][7] Other backers of the VXLAN technology include Huawei,[8] Broadcom, Citrix, Pica8, Cumulus Networks, Dell EMC, Mellanox,[9] FreeBSD,[10] OpenBSD,[11] Red Hat,[12] Joyent, and Juniper Networks.

VXLAN was officially documented by the IETF in RFC 7348.

Open vSwitch is an example of a software-based virtual network switch that 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. ^ "Virtual Extensible LAN (VXLAN) Best Practices (White Paper)" (PDF). Cisco Systems. 2016-01-08. Retrieved 2016-07-04. 
  3. ^ Andre Pech (2013-11-08). "Running OpenStack over a VXLAN Fabric" (PDF). pp. 8, 12. Retrieved 2016-07-04. 
  4. ^ "Open vSwitch Manual: vtep – hardware_vtep database schema". Retrieved 2016-07-04. 
  5. ^ "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 
  6. ^ Timothy Prickett Morgan (30 August 2011). "VMware, Cisco stretch virtual LANs across the heavens". The Register. Retrieved 2013-02-25. 
  7. ^ "Arista and VMware have coauthored a new standard in cloud networking: the Virtual eXtensible LAN (VXLAN)" (PDF). Retrieved 2013-12-01. 
  8. ^ "Huawei CE12800 Series Data Center Switches - Huawei products". Huawei. December 2012. 
  9. ^ Timothy Pricket Morgan (April 23, 2013). "Mellanox adds VM-flitting to ConnectX-3 adapters - Going Pro with VXLAN". The Register. 
  10. ^ "FreeBSD 10.2-RELEASE Release Notes". The FreeBSD Project. The FreeBSD Project. Retrieved 30 June 2016. 
  11. ^ Reyk Floeter (October 14, 2013). "OpenBSD vxlan implementation". Reyk Floeter. 
  12. ^ 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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