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VLAN is a traditional network isolation technology. What Are the Differences Between VXLAN and VLAN?
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Theoretically, a maximum of 16M VXLAN segments are supported, meeting the requirements for identification and isolation of vast quantities of tenants. How does VXLAN meet these requirements? VXLAN adds a 24-bit VXLAN network identifier (VNI) that is equivalent to a VLAN ID to a VXLAN header. In this case, VLAN cannot meet these requirements.
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For example, public clouds or other large virtualized cloud data centers need to accommodate tens of thousands of tenants or even more. This is equivalent to the number of servers being multiplied.
#MAC ADDRESS FLOODING DEFINITION MAC#
After server virtualization, a physical server hosts multiple VMs, and each of which has an independent IP address and MAC address. Sharp Increase in Tenants Raises Demand for Network IsolationĪccording to standards, a traditional VLAN network supports a maximum of about 4000 VLANs. Servers do not need to be aware of how data is forwarded within this "large switch". For servers, VXLAN virtualizes the entire infrastructure network into a large "Layer 2 virtual switch", with all servers connecting to this switch. Any two nodes can communicate through a VXLAN tunnel, regardless of the underlying network structure and other details. VXLAN provides a methodology for creating a virtual tunnel on the IP network to transparently forward user data when communication is required between a source and destination node on the IP network. It is this concept that inspired the design of VXLAN. This meets the requirements for dynamic VM migration. When a server is migrated from one port of the Layer 2 switch to another port, the IP address of the server can remain unchanged. To enable smooth VM migration over a large scope or even between regions, all involved servers must be deployed in a large Layer 2 domain.Ī Layer 2 switch can support Layer 2 communication between servers connected to the switch. Traditional three-layer network architecture limiting the dynamic VM migration scope