How does VXLAN routing work?

When a host sends traffic that belongs to a VNI, a VxLAN enabled switch encapsulates the traffic in UDP and IP headers. This is then sent across the underlay network, just like normal IP traffic. As the underlay is a routed network, it is managed by an IGP, like OSPF or EIGRP.

What is VXLAN packet?

VXLAN is an encapsulation protocol that provides data center connectivity using tunneling to stretch Layer 2 connections over an underlying Layer 3 network. In data centers, VXLAN is the most commonly used protocol to create overlay networks that sit on top of the physical network, enabling the use of virtual networks.

How many networks are possible in a VXLAN?

Each VXLAN network segment is associated with a unique 24bit VXLAN Network Identifier, or VNI. The 24 bit address space allows scaling virtual networks beyond the 4096 available with 802.1Q to 16.7 million possible virtual networks.

What is difference between VLAN and VXLAN?

VxLAN vs. VLAN. The main difference is that VLAN uses the tag on the layer 2 frame for encapsulation and can scale up to 4000 VLANs. VXLAN, on the other hand, encapsulates the MAC in UDP and is capable of scaling up to 16 million VxLAN segments.

Why do we use VXLAN?

VXLAN technology allows you to segment your networks (as VLANs do), but it provides benefits that VLANs cannot. Here are the most important benefits of using VXLANs: You can theoretically create as many as 16 million VXLANs in an administrative domain (as opposed to 4094 VLANs on a Juniper Networks device).

What is the primary function of VXLAN?

The primary goal of VXLAN is to extend the virtual LAN (VLAN) address space by adding a 24-bit segment ID and increasing the number of available IDs to 16 million.

How do I find the VXLAN packet?

VXLAN packet format

8-byte VXLAN header—VXLAN information for the frame. Flags—If the I bit is 1, the VXLAN ID is valid.
8-byte outer UDP header for VXLAN—The default VXLAN destination UDP port number is 4789.
20-byte outer IP header—Valid addresses of VTEPs or VXLAN multicast groups on the transport network.

What does VXLAN stand for?

Virtual Extensible LAN
VXLAN stands for Virtual Extensible LAN. VXLAN is a network virtualization technology. When devices communicate within a Software Defined Datacenter, a VXLAN tunnel is set up between those devices. Those tunnels can be set up on both physical and virtual switches.

What is VXLAN Gateway?

A VXLAN gateway is a solution that allows a virtual extensible LAN (VXLAN) to communicate with another network, particularly a virtual LAN (VLAN). In order for the traffic from a VXLAN to use services on physical devices in a distant network, the traffic must pass through a VXLAN gateway.

What is VXLAN interface?

Virtual Extensible LAN, or VXLAN, interfaces can be used to encapsulate Layer 2 frames inside UDP, carrying traffic for multiple L2 networks across Layer 3 connections such as between routed areas of a datacenter, leased lines, or VPNs.