Why vxlan

VXLAN can meet the two requirements. What Is Server Virtualization? To address this issue, the server virtualization technology emerges.

As shown in Figure , the server virtualization technology virtualizes a physical server into multiple logical servers that are called VMs. VMs connect to external networks through the virtual switches vSwitches on physical servers. Dynamic VM migration is the process of moving VMs from one physical server to another, while ensuring continuity of services deployed on the VMs. End users are unaware of the process, so administrators can flexibly allocate server resources or maintain and upgrade the physical servers without affecting normal server use by end users.

After server virtualization, dynamic VM migration becomes a common practice. Therefore, VMs can be dynamically migrated only in the same Layer 2 domain. As shown in Figure , the traditional three-layer network architecture limits the dynamic VM migration scope.

The migration can occur only in a limited scope and is greatly restricted. To enable smooth VM migration in a large scope or even across regions, all involved servers must be deployed on a large Layer 2 domain. It is well known that a Layer 2 switch can implement Layer 2 communication between servers connected to the switch.

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.

This meets the requirements for dynamic VM migration. VXLAN was designed to meet these requirements. As VXLAN is essentially a tunneling technology, when the source and destination ends need to communicate with each other, a virtual tunnel is created on the IP network of the data center to transparently forward user data between the two ends.

In such tunnel establishment mode, almost a full mesh topology can meet the growing communication needs in the data center. This ensures that any two points can communicate with each other through a VXLAN tunnel without focusing on the structure and details of the underlying network.

All servers are connected to this Layer 2 virtual switch. Servers are unaware of how forwarding is performed within the Layer 2 virtual switch. When a VM is migrated from one port of the Layer 2 virtual switch to another port, the IP address of the VM does not need to be changed. After server virtualization, a physical server hosts multiple VMs.

Public clouds or other large virtualized cloud data centers need to accommodate tens of thousands of tenants or even more. In this case, VLAN cannot meet these requirements. Theoretically, a maximum of 16M VXLAN segments are supported, meeting the requirements for identification and isolation between large networks.

The following describes the functions of VNIs. VLAN is as a traditional network isolation technology. In accordance with standards, a maximum of about 4k VLANs are available, which cannot meet the tenant isolation requirements of large data centers. VXLAN establishes a virtual tunnel between two switches across the basic IP network of the data center and virtualizes the data center network into a large Layer 2 virtual switch to meet the requirements of large-scale dynamic VM migration.

In addition, it also contains the VXLAN Flags field 8 bits, set to and two reserved fields 24 bits and 8 bits, respectively. Port is calculated using the hash algorithm based on the original Ethernet frame. It is the encapsulated outer IP header. It is the encapsulated outer Ethernet header. Using this header will allow you to have up to 16 M layer 2 domains, and if two devices hosted on the same physical infrastructure have the same address, it will not be a problem as long as it is configured in a different VXLAN.

Also, your traffic will be effectively load balanced over the over-relay network as the UDP source port will be different for each VM starting a new connection. My GK. Checkout Cart Loading Create an Account Forgot Your Password? Access MyGK. Discover how we can translate your business needs into the right technology solutions. Request a consultation. We would love to continue to share the latest VectorUSA news and industry updates directly to your inbox. Our Approach Who we are, what we do, and why.

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Leveraging technology with an autonomous solution like VXLAN will: Simplify and reduce administrative overhead while increasing efficiency overall; Help to eliminate network outages to ensure your servers keep running; Allow you to maintain focus on your vital security concerns. Are your network security solutions leveraging the latest technologies to meet the needs of your workforce?

Contact VectorUSA for an evaluation and custom recommendations for improving the security of your network and data. Share this article.