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Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
Convention for heading levels in Open vSwitch documentation:
======= Heading 0 (reserved for the title in a document)
------- Heading 1
~~~~~~~ Heading 2
+++++++ Heading 3
''''''' Heading 4
Avoid deeper levels because they do not render well.
======
VXLANs
======
Q: What's a VXLAN?
A: VXLAN stands for Virtual eXtensible Local Area Network, and is a means
to solve the scaling challenges of VLAN networks in a multi-tenant
environment. VXLAN is an overlay network which transports an L2 network
over an existing L3 network. For more information on VXLAN, please see `RFC
7348 <https://tools.ietf.org/html/rfc7348>`__.
Q: How much of the VXLAN protocol does Open vSwitch currently support?
A: Open vSwitch currently supports the framing format for packets on the
wire. There is currently no support for the multicast aspects of VXLAN. To
get around the lack of multicast support, it is possible to pre-provision
MAC to IP address mappings either manually or from a controller.
Q: What destination UDP port does the VXLAN implementation in Open vSwitch
use?
A: By default, Open vSwitch will use the assigned IANA port for VXLAN,
which is 4789. However, it is possible to configure the destination UDP
port manually on a per-VXLAN tunnel basis. An example of this configuration
is provided below.::
$ ovs-vsctl add-br br0
$ ovs-vsctl add-port br0 vxlan1 -- set interface vxlan1 type=vxlan \
options:remote_ip=192.168.1.2 options:key=flow options:dst_port=8472
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