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Virtual eXtensible Local Area Network (VXLAN) is a tunneling protocol designed to solve the problem of limited VLAN IDs (4096) in IEEE 802.1Q, and it is described by IETF RFC 7348. With VXLAN the size of the identifier is expanded to 24 bits (16777216). It creates a Layer 2 overlay scheme on a Layer 3 network and the protocol runs over UDP. RouterOS VXLAN interface supports IPv4 or IPv6 (since version 7.6), but dual-stack is not supported.

Only devices within the same VXLAN segment can communicate with each other.  Each VXLAN segment is identified through a 24-bit segment ID, termed the VXLAN Network Identifier (VNI). Unlike most tunnels, a VXLAN is a 1 to N network, not just point to point. A VXLAN device can learn the IP address of the other endpoint dynamically in a manner similar to a learning bridge. Multicast or unicast is used to flood broadcast, unknown unicast, and multicast traffic. VXLAN endpoints, which terminate VXLAN tunnels are known as VXLAN tunnel endpoints (VTEPs). 

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Property

Description

arp (disabled | enabled | local-proxy-arp | proxy-arp | reply-only; Default: enabled)Address Resolution Protocol setting
  • disabled - the interface will not use ARP
  • enabled - the interface will use ARP
  • local-proxy-arp -  the router performs proxy ARP on the interface and sends replies to the same interface
  • proxy-arp - the router performs proxy ARP on the interface and sends replies to other interfaces
  • reply-only - the interface will only reply to requests originating from matching IP address/MAC address combinations which are entered as static entries in the IP/ARP table. No dynamic entries will be automatically stored in the IP/ARP table. Therefore for communications to be successful, a valid static entry must already exist.
arp-timeout (auto | integer; Default: auto)How long the ARP record is kept in the ARP table after no packets are received from IP. Value auto equals to the value of arp-timeout in IP/Settings, default is the 30s.
comment (string; Default: )Short description of the interface.
disabled (yes | no; Default: no)Changes whether the interface is disabled.
group (IPv4 | IPv6; Default: )When specified, a multicast group address can be used to forward broadcast, unknown unicast, and multicast traffic between VTEPs. This property requires specifying the interface setting. The interface will use IGMP or MLD to join the specified multicast group, make sure to add the necessary PIM and IGMP/MDL configuration. When this property is set, the vteps-ip-version automatically gets updated to the used multicast IP version.
interface (name; Default:)Interface name used for multicast forwarding. This property requires specifying the group setting.
mac-address (read-only, Default: )

Automatically assigned interface MAC address. This setting cannot be changed.

mtu (integer; Default: 1500)

For the maximum transmission unit, the VXLAN interface will set MTU to 1500 by default. The l2mtu will be set automatically according to the associated interface (subtracting 50 bytes corresponding to the VXLAN header). If no interface is specified, the l2mtu value of 65535 is used. The l2mtu cannot be changed.

name (text; Default: vxlan1)Name of the interface.
port (integer: 1..65535; Default: 8472)

Used UDP port number.

vni (integer: 1..16777216; Default: )

VXLAN Network Identifier (VNI).

vteps-ip-version (ipv4 | ipv6; Default: ipv4)

Used IP protocol version for statically configured VTEPs. RouterOS VXLAN interface does not support dual-stack, any configured remote VTEPs with the opposite IP version will be ignored. When the multicast group property is set, the vteps-ip-version automatically gets updated to the used multicast IP version. The setting is available since RouterOS version 7.6.


Sub-menu:

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languageros

 /interface

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vxlan vteps

Property

Description

interface (name; Default:)Name of the VXLAN interface.
port (integer: 1..65535; Default: 8472)

Used UDP port number.

remote-ip (IPv4 | IPv6; Default: )

The IPv4 destination or IPv6 destination address of remote VTEP.

Configuration example

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