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64 lines
2.4 KiB
ReStructuredText
64 lines
2.4 KiB
ReStructuredText
:lastproofread: 2022-08-26
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.. _geneve-interface:
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######
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GENEVE
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######
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:abbr:`GENEVE (Generic Network Virtualization Encapsulation)` supports all of
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the capabilities of :abbr:`VXLAN (Virtual Extensible LAN)`, :abbr:`NVGRE
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(Network Virtualization using Generic Routing Encapsulation)`, and :abbr:`STT
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(Stateless Transport Tunneling)` and was designed to overcome their perceived
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limitations. Many believe GENEVE could eventually replace these earlier formats
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entirely.
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GENEVE is designed to support network virtualization use cases, where tunnels
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are typically established to act as a backplane between the virtual switches
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residing in hypervisors, physical switches, or middleboxes or other appliances.
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An arbitrary IP network can be used as an underlay although Clos networks - A
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technique for composing network fabrics larger than a single switch while
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maintaining non-blocking bandwidth across connection points. ECMP is used to
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divide traffic across the multiple links and switches that constitute the
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fabric. Sometimes termed "leaf and spine" or "fat tree" topologies.
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Geneve Header:
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.. code-block:: none
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Ver| Opt Len |O|C| Rsvd. | Protocol Type |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Virtual Network Identifier (VNI) | Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Variable Length Options |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*************
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Configuration
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*************
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Common interface configuration
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==============================
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.. cmdinclude:: /_include/interface-common-without-dhcp.txt
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:var0: geneve
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:var1: gnv0
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GENEVE options
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==============
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.. cfgcmd:: set interfaces geneve gnv0 remote <address>
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Configure GENEVE tunnel far end/remote tunnel endpoint.
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.. cfgcmd:: set interfaces geneve gnv0 vni <vni>
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:abbr:`VNI (Virtual Network Identifier)` is an identifier for a unique
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element of a virtual network. In many situations this may represent an L2
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segment, however, the control plane defines the forwarding semantics of
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decapsulated packets. The VNI MAY be used as part of ECMP forwarding
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decisions or MAY be used as a mechanism to distinguish between overlapping
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address spaces contained in the encapsulated packet when load balancing
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across CPUs.
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