Network - vxlan

What is? VXLAN

VXLAN It's a network virtualization technology , It will be the original Ethernet packet , Packaged in UDP header And VXLAN header Inside .

port

VXLAN Tunnel used UDP port ,IANA The assigned is 4789,Linux Kernel assigned is 8472.

Use scenarios

VXLAN Application in virtual machine migration between cloud data centers , For example, an enterprise has virtual machines with different business applications in different data centers , Virtual machine migration between data centers is often encountered , In order to ensure that the business will not be interrupted in the process of virtual machine migration , You need to ensure the migration of virtual machines IP Address 、MAC Address and other parameters remain unchanged , This requires that virtual machines belong to a unified layer-2 network before and after migration . If traditional methods are used to solve this problem , You may need to purchase new physical devices to separate traffic , And may cause problems such as VLAN Scattered 、 Network looping and system and management overhead .

Reference material

VLAN and VXLAN, What is the difference between the two ？VXLAN What are the application scenarios ？-51CTO.COM

https://learning.oreilly.com/library/view/learning-openstack-networking/9781788392495/576986af-ab3d-460e-bc58-75b13ac9a664.xhtml#:~:text=The%20default%20port%20for%20UDP,port%20used%20by%20Open%20vSwitch.

VXLAN Packet Format - NetEngine 8000 F V800R012C00SPC300 Feature Description - LAN Access and MAN Access 04 - Huawei

VXLAN Application in virtual machine migration scenario - CloudEngine 16800 V200R020C10 Configuration Guide -VXLAN - Huawei

Smooth VM Migration Using VXLAN - S5720 and S6720 V200R011C10 Configuration Guide - VXLAN - Huawei

EVPN/SDN Assisted Live VM Migration between Geo-Distributed Data Centers | IEEE Conference Publication | IEEE Xplore