Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 679
VXLAN, VXLAN concepts
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8 VXLAN 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 8. VXLAN topology VXLAN concepts Network An overlay network extends L2 connectivity between server virtual machines (VMs) in a tenant segment over an virtualization overlay underlay L3 IP network. A tenant segment can be a group of hosts or servers that are spread across an underlay (NVO) network. • The NVO overlay network uses a separate L2 bridge domain (virtual network), which is independent of legacy VLAN forwarding. • The NVO underlay network operates in the default VRF using the existing L3 infrastructure and routing protocols. VXLAN 679
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