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Diffstat (limited to 'docs/interfaces/vxlan.rst')
| -rw-r--r-- | docs/interfaces/vxlan.rst | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/docs/interfaces/vxlan.rst b/docs/interfaces/vxlan.rst index d432bdc6..ac818fcc 100644 --- a/docs/interfaces/vxlan.rst +++ b/docs/interfaces/vxlan.rst @@ -1,12 +1,37 @@ +.. _vxlan-interface: + VXLAN ----- -VXLAN is an overlaying Ethernet over IP protocol, it's described in :rfc:`7348`. +: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 accross multiple vendors. + Multicast VXLAN ^^^^^^^^^^^^^^^^ @@ -297,5 +322,5 @@ Let's change the Multicast example from above: # leaf3 set interface vxlan vxlan241 remote 10.1.2.2 -The default port udp is set to 8472. +The default port udp is set to 8472. It can be changed with ``set interface vxlan <vxlanN> remote-port <port>`` |