Virtual Extensible LAN
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
- Distributed Overlay Virtual Ethernet (DOVE)
- Generic Routing Encapsulation (GRE)
- IEEE 802.1ad, an Ethernet networking standard, also known as provider bridging, Stacked VLANs, or simply QinQ.
- NVGRE, a similar competing specification
- Overlay Transport Virtualization (OTV)
- Virtual LAN (VLAN)
References
- ↑ Steve Herrod (August 30, 2011). "Towards Virtualized Networking for the Cloud". VMware. Retrieved 2013-02-25.
- ↑ "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
- ↑ Timothy Prickett Morgan (30 August 2011). "VMware, Cisco stretch virtual LANs across the heavens". The Register. Retrieved 2013-02-25.
- ↑ "Arista and VMware have coauthored a new standard in cloud networking: the Virtual eXtensible LAN (VXLAN)". Retrieved 2013-12-01.
- ↑ Timothy Pricket Morgan (April 23, 2013). "Mellanox adds VM-flitting to ConnectX-3 adapters - Going Pro with VXLAN". The Register.
- ↑ Reyk Floeter (October 14, 2013). "OpenBSD vxlan implementation". Reyk Floeter.
- ↑ M. Mahalingam et al. (February 22, 2013). "VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks". Retrieved 2013-02-25.
External links
- Mahalingam, Mallik; Dutt, Dinesh G.; et al. (2013-05-08). VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks. IETF. I-D draft-mahalingam-dutt-dcops-vxlan. https://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan.
- RFC7348 – Virtual eXtensible Local Area Network (VXLAN): A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
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