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-.. _vxlan-interface:
-
-#####
-VXLAN
-#####
-
-:abbr:`VXLAN (Virtual Extensible LAN)` is a network virtualization technology
-that attempts to address the scalability problems associated with large cloud
-computing deployments. It uses a VLAN-like encapsulation technique to
-encapsulate OSI layer 2 Ethernet frames within layer 4 UDP datagrams, using
-4789 as the default IANA-assigned destination UDP port number. VXLAN
-endpoints, which terminate VXLAN tunnels and may be either virtual or physical
-switch ports, are known as :abbr:`VTEPs (VXLAN tunnel endpoints)`.
-
-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
-head-end replication (HER) is used to flood broadcast, unknown unicast,
-and multicast (BUM) traffic.
-
-The VXLAN specification was originally created by VMware, Arista Networks
-and Cisco. Other backers of the VXLAN technology include Huawei, Broadcom,
-Citrix, Pica8, Big Switch Networks, Cumulus Networks, Dell EMC, Ericsson,
-Mellanox, FreeBSD, OpenBSD, Red Hat, Joyent, and Juniper Networks.
-
-VXLAN was officially documented by the IETF in :rfc:`7348`.
-
-If configuring VXLAN in a VyOS virtual machine, ensure that MAC spoofing
-(Hyper-V) or Forged Transmits (ESX) are permitted, otherwise forwarded frames
-may be blocked by the hypervisor.
-
-.. note:: As VyOS is based on Linux and there was no official IANA port assigned
-   for VXLAN, VyOS uses a default port of 8472. You can change the port on a
-   per VXLAN interface basis to get it working across multiple vendors.
-
-Configuration
-=============
-
-Common interface configuration
-------------------------------
-
-.. cmdinclude:: ../_include/interface-common-without-dhcp.txt
-  :var0: vxlan
-  :var1: vxlan0
-
-VXLAN specific options
------------------------
-
-.. cfgcmd:: set interfaces vxlan <interface> vni <number>
-
-  Each VXLAN segment is identified through a 24-bit segment ID, termed the
-  :abbr:`VNI (VXLAN Network Identifier (or VXLAN Segment ID))`, This allows
-  up to 16M VXLAN segments to coexist within the same administrative domain.
-
-.. cfgcmd:: set interfaces vxlan <interface> port <port>
-
-  Configure port number of remote VXLAN endpoint.
-
-  .. note:: As VyOS is Linux based the default port used is not using 4789
-     as the default IANA-assigned destination UDP port number. Instead VyOS
-     uses the Linux default port of 8472.
-
-.. cfgcmd:: set interfaces vxlan <interface> source-address <interface>
-
-  Source IP address used for VXLAN underlay. This is mandatory when using VXLAN
-  via L2VPN/EVPN.
-
-Unicast
-^^^^^^^
-
-.. cfgcmd:: set interfaces vxlan <interface> remote <address>
-
-  IPv4/IPv6 remote address of the VXLAN tunnel. Alternative to multicast, the
-  remote IPv4/IPv6 address can set directly.
-
-Multicast
-^^^^^^^^^
-
-.. cfgcmd:: set interfaces vxlan <interface> source-interface <interface>
-
-  Interface used for VXLAN underlay. This is mandatory when using VXLAN via
-  a multicast network. VXLAN traffic will always enter and exit this interface.
-
-
-.. cfgcmd:: set interfaces vxlan <interface> group <address>
-
-  Multicast group address for VXLAN interface. VXLAN tunnels can be built
-  either via Multicast or via Unicast.
-
-  Both IPv4 and IPv6 multicast is possible.
-
-Multicast VXLAN
-===============
-
-Topology: PC4 - Leaf2 - Spine1 - Leaf3 - PC5
-
-PC4 has IP 10.0.0.4/24 and PC5 has IP 10.0.0.5/24, so they believe they are in
-the same broadcast domain.
-
-Let's assume PC4 on Leaf2 wants to ping PC5 on Leaf3. Instead of setting Leaf3
-as our remote end manually, Leaf2 encapsulates the packet into a UDP-packet and
-sends it to its designated multicast-address via Spine1. When Spine1 receives
-this packet it forwards it to all other Leafs who has joined the same
-multicast-group, in this case Leaf3. When Leaf3 receives the packet it forwards
-it, while at the same time learning that PC4 is reachable behind Leaf2, because
-the encapsulated packet had Leaf2's IP-address set as source IP.
-
-PC5 receives the ping echo, responds with an echo reply that Leaf3 receives and
-this time forwards to Leaf2's unicast address directly because it learned the
-location of PC4 above. When Leaf2 receives the echo reply from PC5 it sees that
-it came from Leaf3 and so remembers that PC5 is reachable via Leaf3.
-
-Thanks to this discovery, any subsequent traffic between PC4 and PC5 will not
-be using the multicast-address between the Leafs as they both know behind which
-Leaf the PCs are connected. This saves traffic as less multicast packets sent
-reduces the load on the network, which improves scalability when more Leafs are
-added.
-
-For optimal scalability Multicast shouldn't be used at all, but instead use BGP
-to signal all connected devices between leafs. Unfortunately, VyOS does not yet
-support this.
-
-Example
--------
-
-The setup is this: Leaf2 - Spine1 - Leaf3
-
-Spine1 is a Cisco IOS router running version 15.4, Leaf2 and Leaf3 is each a
-VyOS router running 1.2.
-
-This topology was built using GNS3.
-
-Topology:
-
-.. code-block:: none
-
-  Spine1:
-  fa0/2 towards Leaf2, IP-address: 10.1.2.1/24
-  fa0/3 towards Leaf3, IP-address: 10.1.3.1/24
-
-  Leaf2:
-  Eth0 towards Spine1, IP-address: 10.1.2.2/24
-  Eth1 towards a vlan-aware switch
-
-  Leaf3:
-  Eth0 towards Spine1, IP-address 10.1.3.3/24
-  Eth1 towards a vlan-aware switch
-
-**Spine1 Configuration:**
-
-.. code-block:: none
-
-  conf t
-  ip multicast-routing
-  !
-  interface fastethernet0/2
-   ip address 10.1.2.1 255.255.255.0
-   ip pim sparse-dense-mode
-  !
-  interface fastethernet0/3
-   ip address 10.1.3.1 255.255.255.0
-   ip pim sparse-dense-mode
-  !
-  router ospf 1
-   network 10.0.0.0 0.255.255.255 area 0
-
-Multicast-routing is required for the leafs to forward traffic between each
-other in a more scalable way. This also requires PIM to be enabled towards the
-Leafs so that the Spine can learn what multicast groups each Leaf expect
-traffic from.
-
-**Leaf2 configuration:**
-
-.. code-block:: none
-
-  set interfaces ethernet eth0 address '10.1.2.2/24'
-  set protocols ospf area 0 network '10.0.0.0/8'
-
-  ! Our first vxlan interface
-  set interfaces bridge br241 address '172.16.241.1/24'
-  set interfaces bridge br241 member interface 'eth1.241'
-  set interfaces bridge br241 member interface 'vxlan241'
-
-  set interfaces vxlan vxlan241 group '239.0.0.241'
-  set interfaces vxlan vxlan241 source-interface 'eth0'
-  set interfaces vxlan vxlan241 vni '241'
-
-  ! Our seconds vxlan interface
-  set interfaces bridge br242 address '172.16.242.1/24'
-  set interfaces bridge br242 member interface 'eth1.242'
-  set interfaces bridge br242 member interface 'vxlan242'
-
-  set interfaces vxlan vxlan242 group '239.0.0.242'
-  set interfaces vxlan vxlan242 source-interface 'eth0'
-  set interfaces vxlan vxlan242 vni '242'
-
-**Leaf3 configuration:**
-
-.. code-block:: none
-
-  set interfaces ethernet eth0 address '10.1.3.3/24'
-  set protocols ospf area 0 network '10.0.0.0/8'
-
-  ! Our first vxlan interface
-  set interfaces bridge br241 address '172.16.241.1/24'
-  set interfaces bridge br241 member interface 'eth1.241'
-  set interfaces bridge br241 member interface 'vxlan241'
-
-  set interfaces vxlan vxlan241 group '239.0.0.241'
-  set interfaces vxlan vxlan241 source-interface 'eth0'
-  set interfaces vxlan vxlan241 vni '241'
-
-  ! Our seconds vxlan interface
-  set interfaces bridge br242 address '172.16.242.1/24'
-  set interfaces bridge br242 member interface 'eth1.242'
-  set interfaces bridge br242 member interface 'vxlan242'
-
-  set interfaces vxlan vxlan242 group '239.0.0.242'
-  set interfaces vxlan vxlan242 source-interface 'eth0'
-  set interfaces vxlan vxlan242 vni '242'
-
-As you can see, Leaf2 and Leaf3 configuration is almost identical. There are
-lots of commands above, I'll try to into more detail below, command
-descriptions are placed under the command boxes:
-
-.. code-block:: none
-
-  set interfaces bridge br241 address '172.16.241.1/24'
-
-This commands creates a bridge that is used to bind traffic on eth1 vlan 241
-with the vxlan241-interface. The IP-address is not required. It may however be
-used as a default gateway for each Leaf which allows devices on the vlan to
-reach other subnets. This requires that the subnets are redistributed by OSPF
-so that the Spine will learn how to reach it. To do this you need to change the
-OSPF network from '10.0.0.0/8' to '0.0.0.0/0' to allow 172.16/12-networks to be
-advertised.
-
-.. code-block:: none
-
-  set interfaces bridge br241 member interface 'eth1.241'
-  set interfaces bridge br241 member interface 'vxlan241'
-
-Binds eth1.241 and vxlan241 to each other by making them both member interfaces of
-the same bridge.
-
-.. code-block:: none
-
-  set interfaces vxlan vxlan241 group '239.0.0.241'
-
-The multicast-group used by all Leafs for this vlan extension. Has to be the
-same on all Leafs that has this interface.
-
-.. code-block:: none
-
-  set interfaces vxlan vxlan241 source-interface 'eth0'
-
-Sets the interface to listen for multicast packets on. Could be a loopback, not
-yet tested.
-
-.. code-block:: none
-
-  set interfaces vxlan vxlan241 vni '241'
-
-Sets the unique id for this vxlan-interface. Not sure how it correlates with
-multicast-address.
-
-.. code-block:: none
-
-  set interfaces vxlan vxlan241 port 12345
-
-The destination port used for creating a VXLAN interface in Linux defaults to
-its pre-standard value of 8472 to preserve backwards compatibility. A
-configuration directive to support a user-specified destination port to override
-that behavior is available using the above command.
-
-Unicast VXLAN
-=============
-
-Alternative to multicast, the remote IPv4 address of the VXLAN tunnel can be
-set directly. Let's change the Multicast example from above:
-
-.. code-block:: none
-
-  # leaf2 and leaf3
-  delete interfaces vxlan vxlan241 group '239.0.0.241'
-  delete interfaces vxlan vxlan241 source-interface 'eth0'
-
-  # leaf2
-  set interface vxlan vxlan241 remote 10.1.3.3
-
-  # leaf3
-  set interface vxlan vxlan241 remote 10.1.2.2
-
-The default port udp is set to 8472.
-It can be changed with ``set interface vxlan <vxlanN> port <port>``