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authorrebortg <github@ghlr.de>2020-12-08 14:57:44 +0100
committerrebortg <github@ghlr.de>2020-12-08 14:57:44 +0100
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+.. _geneve-interface:
+
+######
+GENEVE
+######
+
+:abbr:`GENEVE (Generic Network Virtualization Encapsulation)` supports all of
+the capabilities of :abbr:`VXLAN (Virtual Extensible LAN)`, :abbr:`NVGRE
+(Network Virtualization using Generic Routing Encapsulation)`, and :abbr:`STT
+(Stateless Transport Tunneling)` and was designed to overcome their perceived
+limitations. Many believe GENEVE could eventually replace these earlier formats
+entirely.
+
+GENEVE is designed to support network virtualization use cases, where tunnels
+are typically established to act as a backplane between the virtual switches
+residing in hypervisors, physical switches, or middleboxes or other appliances.
+An arbitrary IP network can be used as an underlay although Clos networks - A
+technique for composing network fabrics larger than a single switch while
+maintaining non-blocking bandwidth across connection points. ECMP is used to
+divide traffic across the multiple links and switches that constitute the
+fabric. Sometimes termed "leaf and spine" or "fat tree" topologies.
+
+Geneve Header:
+
+.. code-block:: none
+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |Ver| Opt Len |O|C| Rsvd. | Protocol Type |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Virtual Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Variable Length Options |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+*************
+Configuration
+*************
+
+Common interface configuration
+==============================
+
+.. cmdinclude:: /_include/interface-common-without-dhcp.txt
+ :var0: geneve
+ :var1: gnv0
+
+GENEVE options
+==============
+
+.. cfgcmd:: set interfaces geneve gnv0 remote <address>
+
+ Configure GENEVE tunnel far end/remote tunnel endpoint.
+
+.. cfgcmd:: set interfaces geneve gnv0 vni <vni>
+
+ :abbr:`VNI (Virtual Network Identifier)` is an identifier for a unique
+ element of a virtual network. In many situations this may represent an L2
+ segment, however, the control plane defines the forwarding semantics of
+ decapsulated packets. The VNI MAY be used as part of ECMP forwarding
+ decisions or MAY be used as a mechanism to distinguish between overlapping
+ address spaces contained in the encapsulated packet when load balancing
+ across CPUs.