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This lets us keep all our docs in code where we can see them. Change-Id: I78ae5afbf9d17ddfde57208402ed3813492c28bc
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Glossary
Calico
A virtual networking solution that uses IP routing (layer 3) to provide connectivity in the form of a flat IP network instead of bridging and tunneling.
Refer to the Calico documentation__ for more information.
Fast Path
When used, 6Wind's proprietary fast path technology behaves as a transparent acceleration layer for traditional switches (
Open vSwitch,Linux Bridge) and for alternative networking mechanisms (Calico, Midonet).
Linux Bridge
The native networking "backend" found in Linux.
Refer to the Linux Foundation wiki__ for more information.
Open vSwitch
A software implementation of a
virtual multilayer network switch <vSwitch>Refer to the OVS documentation__ for more information.
VEB Virtual Ethernet Bridge
A virtual Ethernet switch that implmented in a virtualized server environment. It is anything that mimics a traditional external layer 2 (L2) switch or bridge for connecting VMs. Generally implemented as a
vSwitch, though hardware-based VEBs using SR-IOV are possible.Refer to this Virtual networking technologies brief__ for more information.
__ http://cs.nyu.edu/courses/fall14/CSCI-GA.3033-010/Network/SDN.pdf
vSwitch Virtual Switch
A software-based virtual switch that connects virtual NICs to other virtual NICs and the broader physical network.
Refer to this presentation__ for more information.
__ http://cs.nyu.edu/courses/fall14/CSCI-GA.3033-010/Network/SDN.pdf
VEPA Virtual Ethernet Port Aggregator
An approach to virtual networking where VM traffic is handled on the physical network rather than by a virtual switch. Unlike
VNTag, frames are not tagged and the switch will use a single port to handle allVIFs <VIF>for a host.The basis of the
802.1Qbgspec.Refer to this presentation__ for more information.
__ http://www.ieee802.org/1/files/public/docs2009/new-hudson-vepa_summary-0509.pdf
VN-Tag VNTag
An approach to virtual networking where an interface virtualizer (IV) is used in place of a
VEBto connect multipleVIFs <VIF>to a single, external, IV-capable hardware bridge. Each VIF is tagged with a unique ID (vif_id) which is used to route traffic through IVs, and VIFs are then treated like any other interface.The basis of the
802.1Qbhand802.1Qbrspecs.Refer to this Cisco presentation__ for more information.
vhost
An alternative to
virtiothat allows userspace guest processes to share virtqueues directly with the kernel (or, more specifically, a kernel module) preventing the QEMU process from becoming a bottleneck.
vhost-user
A variation of
vhostthat operates entirely in userspace. This allows userspace guest processes to share virtqueues with other processes operating in userspace, such as virtual switches, avoiding the kernel entirely and maximize performance.When used, a guest exposes a UNIX socket for its control plane, allowing the external userspace service to provide the backend data plane via a mapped memory region. This process must implement the corresponding virtio vhost protocol, such as
virtio-netfor networking, on this socket.Refer to the QEMU documentation__ for more information.
__ https://github.com/qemu/qemu/blob/master/docs/specs/vhost-user.txt
virtio
A class of virtual device emulated by QEMU. Virtio devices have virtqueues which can be used to share data from host to guest.
Refer to the libvirt Wiki__ for more information.
virtio-net
A network driver implementation based on virtio. Guests share virtqueues with the QEMU process, which in turn receives this traffic and forwards it to the host.
Refer to the KVM documentation__ for more information.
VIF
A virtual network interface.
IEEE 802.1Q 802.1Q
A networking standard that supports virtual LANs (VLANs) on an Ethernet network.
Refer to the IEEE spec__ for more information.
IEEE 802.1Qbg 802.1Qbg
An amendment to the
802.1Qspec known as "Edge Virtual Bridging", 802.1Qbg is an approach to networking where VM traffic is handled on the physical network rather than by a virtual switch. Originally based onVEPA.Refer to the IEEE spec__ for more information.
IEEE 802.1Qbh 802.1Qbh
A withdrawn amendment to the
802.1Qspec known as "Bridge Port Extensions", replaced by802.1Qbrspec.Refer to the IEEE spec__ for more information.
IEEE 802.1Qbr 802.1Qbr
An amendment to the
802.1Qspec known as "Bridge Port Extensions",Refer to the IEEE spec__ for more information.
tc
A framework for interacting with traffic control settings (QoS, essentially) in the Linux kernel.
Refer to the tc(8) man page__ for more information.
SR-IOV Single Root I/O Virtualization
An extension to the PCI Express (PCIe) specification that allows a device, typically a network adapter, to split access to its resources among various PCIe hardware functions,
physical <PF>orvirtual <VF>.Refer to this article by Scott Lowe__ or the original PCI-SIG spec__ (paywall) for more information.
__ http://blog.scottlowe.org/2009/12/02/what-is-sr-iov/ __ https://members.pcisig.com/wg/PCI-SIG/document/download/8272
PF Physical Function
In SR-IOV, a PCIe function that has full configuration resources. An SR-IOV device can have up to 8 PFs, though this varies between devices. A PF would typically correspond to a single interface on a NIC.
Refer to this article by Scott Lowe__ for more information.
VF Virtual Function
In SR-IOV, a PCIe function that lacks configuration resources. An SR-IOV device can have up to 256 VFs, though this varies between devices. A VF must be of the same type as the parent device's
PF.Refer to this article by Scott Lowe__ for more information.