211 lines
6.2 KiB
ReStructuredText
211 lines
6.2 KiB
ReStructuredText
========
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Glossary
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========
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.. glossary::
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Calico
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A virtual networking solution that uses IP routing (layer 3) to provide
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connectivity in the form of a flat IP network instead of bridging and
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tunneling.
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Refer to the `Calico documentation`__ for more information.
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__ http://docs.projectcalico.org
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Linux Bridge
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The native networking "backend" found in Linux.
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Refer to the `Linux Foundation wiki`__ for more information.
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__ https://wiki.linuxfoundation.org/networking/bridge
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Open vSwitch
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A software implementation of a :term:`virtual multilayer network switch
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<vSwitch>`
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Refer to the `OVS documentation`__ for more information.
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__ http://docs.openvswitch.org
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VEB
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Virtual Ethernet Bridge
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A virtual Ethernet switch that implmented in a virtualized server
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environment. It is anything that mimics a traditional external layer 2
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(L2) switch or bridge for connecting VMs. Generally implemented as a
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:term:`vSwitch`, though hardware-based VEBs using SR-IOV are possible.
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Refer to this `Virtual networking technologies brief`__ for more
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information.
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__ http://cs.nyu.edu/courses/fall14/CSCI-GA.3033-010/Network/SDN.pdf
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vSwitch
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Virtual Switch
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A software-based virtual switch that connects virtual NICs to other
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virtual NICs and the broader physical network.
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Refer to this `presentation`__ for more information.
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__ http://cs.nyu.edu/courses/fall14/CSCI-GA.3033-010/Network/SDN.pdf
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VEPA
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Virtual Ethernet Port Aggregator
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An approach to virtual networking where VM traffic is handled on the
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physical network rather than by a virtual switch. Unlike :term:`VNTag`,
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frames are not tagged and the switch will use a single port to handle all
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:term:`VIFs <VIF>` for a host.
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The basis of the :term:`802.1Qbg` spec.
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Refer to this `presentation`__ for more information.
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__ http://www.ieee802.org/1/files/public/docs2009/new-hudson-vepa_summary-0509.pdf
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VN-Tag
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VNTag
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An approach to virtual networking where an interface virtualizer (IV) is
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used in place of a :term:`VEB` to connect multiple :term:`VIFs <VIF>` to a
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single, external, IV-capable hardware bridge. Each VIF is tagged with a
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unique ID (`vif_id`) which is used to route traffic through IVs, and VIFs
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are then treated like any other interface.
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The basis of the :term:`802.1Qbh` and :term:`802.1Qbr` specs.
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Refer to this `Cisco presentation`__ for more information.
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__ https://learningnetwork.cisco.com/docs/DOC-27114
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vhost
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An alternative to :term:`virtio` that allows a userspace process to share
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*virtqueues* directly with the kernel, preventing the QEMU process from
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becoming a bottleneck.
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vhost-user
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A variation of :term:`vhost` that operates entirely in userspace. This
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allows processes operating in userspace, such as virtual switches, to
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avoid the kernel entirely and maximize performance.
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Refer to the `QEMU documentation`__ for more information.
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__ https://github.com/qemu/qemu/blob/master/docs/specs/vhost-user.txt
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virtio
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A class of virtual device emulated by QEMU. Virtio devices have
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*virtqueues* which can be used to share data from host to guest.
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Refer to the `libvirt Wiki`__ for more information.
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__ https://wiki.libvirt.org/page/Virtio
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virtio-net
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A network driver implementation based on virtio. Guests share *virtqueues*
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with the QEMU process, which in turn receives this traffic and forwards it
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to the host.
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Refer to the `KVM documentation`__ for more information.
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__ http://www.linux-kvm.org/page/Virtio
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VIF
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A virtual network interface.
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IEEE 802.1Q
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802.1Q
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A networking standard that supports virtual LANs (VLANs) on an Ethernet
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network.
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Refer to the `IEEE spec`__ for more information.
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__ http://www.ieee802.org/1/pages/802.1Q.html
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IEEE 802.1Qbg
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802.1Qbg
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An amendment to the :term:`802.1Q` spec known as "Edge Virtual Bridging",
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802.1Qbg is an approach to networking where VM traffic is handled on the
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physical network rather than by a virtual switch. Originally based on
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:term:`VEPA`.
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Refer to the `IEEE spec`__ for more information.
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__ http://www.ieee802.org/1/pages/802.1bg.html
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IEEE 802.1Qbh
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802.1Qbh
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A withdrawn amendment to the :term:`802.1Q` spec known as "Bridge Port
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Extensions", replaced by :term:`802.1Qbr` spec.
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Refer to the `IEEE spec`__ for more information.
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__ http://www.ieee802.org/1/pages/802.1bh.html
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IEEE 802.1Qbr
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802.1Qbr
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An amendment to the :term:`802.1Q` spec known as "Bridge Port Extensions",
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Refer to the `IEEE spec`__ for more information.
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__ http://www.ieee802.org/1/pages/802.1br.html
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tc
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A framework for interacting with traffic control settings (QoS,
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essentially) in the Linux kernel.
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Refer to the `tc(8) man page`__ for more information.
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__ https://linux.die.net/man/8/tc
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SR-IOV
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Single Root I/O Virtualization
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An extension to the PCI Express (PCIe) specification that allows a device,
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typically a network adapter, to split access to its resources among
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various PCIe hardware functions, :term:`physical <PF>` or :term:`virtual
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<VF>`.
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Refer to this `article by Scott Lowe`__ or the original `PCI-SIG spec`__
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(paywall) for more information.
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__ http://blog.scottlowe.org/2009/12/02/what-is-sr-iov/
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__ https://members.pcisig.com/wg/PCI-SIG/document/download/8272
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PF
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Physical Function
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In SR-IOV, a PCIe function that has full configuration resources. An
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SR-IOV device can have *up to* 8 PFs, though this varies between devices.
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A PF would typically correspond to a single interface on a NIC.
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Refer to this `article by Scott Lowe`__ for more information.
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__ http://blog.scottlowe.org/2009/12/02/what-is-sr-iov/
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VF
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Virtual Function
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In SR-IOV, a PCIe function that lacks configuration resources. An SR-IOV
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device can have *up to* 256 VFs, though this varies between devices. A VF
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must be of the same type as the parent device's :term:`PF`.
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Refer to this `article by Scott Lowe`__ for more information.
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__ http://blog.scottlowe.org/2009/12/02/what-is-sr-iov/
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