A virtual extensible LAN (VXLAN) extends Layer 2
(L2) server connectivity over an underlying Layer 3 (L3) transport network
in a virtualized data center. A virtualized data center consists of
virtual machines (VMs) in a multi-tenant environment. OS10 supports
VXLAN as described in RFC 7348.
VXLAN provides a L2 overlay mechanism on an existing
L3 network by encapsulating the L2 frames in L3 packets.
The VXLAN-shared forwarding domain allows hosts such as virtual and physical
machines, in tenant L2 segments to communicate over the shared
IP network. Each tenant L2 segment is identified by a 24-bit
ID called a VXLAN network identifier (VNI).
Deployed as a VXLAN gateway, an OS10 switch performs
encapsulation/de-encapsulation of L2 frames in L3 packets while tunneling
server traffic. In this role, an OS10 switch operates as a VXLAN tunnel
endpoint (VTEP). Using VXLAN tunnels, server VLAN segments communicate
through the extended L2 forwarding domain. Figure 1. VXLAN topology. VXLAN topology
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