Virtual Extensible LAN

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Short description: Network tunneling protocol

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 OSI layer 2 Ethernet frames within layer 4 UDP datagrams, using 4789 as the default IANA-assigned destination UDP port number.[1] VXLAN endpoints, which terminate VXLAN tunnels and may be either virtual or physical switch ports, are known as VXLAN tunnel endpoints (VTEPs).[2][3]

VXLAN is an evolution of efforts to standardize on an overlay encapsulation protocol. Compared to VLAN which provides limited number of layer-2 VLANs (typically using 12-bit VLAN ID), VXLAN increases scalability up to 16 million logical networks (with 24-bit VNID) and allows for layer-2 adjacency across IP networks. Multicast or unicast with head-end replication (HER) is used to flood Broadcast, unknown-unicast and multicast traffic.[4]

The VXLAN specification was originally created by VMware, Arista Networks and Cisco.[5][6] Other backers of the VXLAN technology include Huawei,[7] Broadcom, Citrix, Pica8, Big Switch Networks, Cumulus Networks, Dell EMC, Ericsson, Mellanox,[8] FreeBSD,[9] OpenBSD,[10] Red Hat,[11] Joyent, and Juniper Networks.

VXLAN is officially documented by the IETF in RFC 7348.[11] VXLAN encapsulates a MAC frame in a UDP datagram for transport across an IP network,[12] creating an overlay network or tunnel.

Open vSwitch is an example of a software-based virtual network switch that supports VXLAN overlay networks.

See also


References

  1. ↑ Steve Herrod (August 30, 2011). "Towards Virtualized Networking for the Cloud". VMware. http://blogs.vmware.com/console/2011/08/towards-virtualized-networking-for-the-cloud.html. 
  2. ↑ Andre Pech (2013-11-08). "Running OpenStack over a VXLAN Fabric". pp. 8, 12. https://www.openstack.org/assets/presentation-media/OpenStackOverVxlan.pdf. 
  3. ↑ "Open vSwitch Manual: vtep – hardware_vtep database schema". http://openvswitch.org/support/dist-docs/vtep.5.html. 
  4. ↑ "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
  5. ↑ Timothy Prickett Morgan (30 August 2011). "VMware, Cisco stretch virtual LANs across the heavens". The Register. https://www.theregister.co.uk/2011/08/30/vmware_cisco_vxlan_spec/. 
  6. ↑ "VXLAN Bridges Virtual and Physical Networks to the Cloud". http://www.arista.com/media/system/pdf/TechBulletins/VXLAN_Overview.pdf. 
  7. ↑ "Huawei CE12800 Series Data Center Switches - Huawei products". Huawei. December 2012. http://e.huawei.com/en/products/enterprise-networking/switches/data-center-switches/ce12800/. 
  8. ↑ Timothy Pricket Morgan (April 23, 2013). "Mellanox adds VM-flitting to ConnectX-3 adapters - Going Pro with VXLAN". The Register. https://www.theregister.co.uk/Print/2013/04/23/mellanox_connectx_3_server_adapters/. 
  9. ↑ "FreeBSD 10.2-RELEASE Release Notes". https://www.freebsd.org/releases/10.2R/relnotes.html. 
  10. ↑ Reyk Floeter (October 14, 2013). "OpenBSD vxlan implementation". Reyk Floeter. http://permalink.gmane.org/gmane.os.openbsd.cvs/123361. 
  11. ↑ 11.0 11.1 Mahalingam, Mallik; Dutt, Dinesh G. et al. (August 2014), VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks, IETF, doi:10.17487/RFC7348, RFC 7348, https://tools.ietf.org/html/rfc7348 
  12. ↑ M. Mahalingam (February 22, 2013). "What Is VXLAN". Huawei. https://support.huawei.com/enterprise/en/doc/EDOC1100086966. 

External links




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