Users Guide

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 9. VXLAN topology
NOTE:
This feature is not supported on the Z9332F-ON platform.
VXLAN concepts
Network
virtualization
overlay (NVO)
An overlay network extends L2 connectivity between server virtual machines (VMs) in a tenant segment over an
underlay L3 IP network. A tenant segment can be a group of hosts or servers that are spread across an underlay
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.
Virtual extensible
LAN (VXLAN)
A type of network virtualization overlay that encapsulates a tenant payload into IP UDP packets for transport
across the IP underlay network.
VXLAN network
identifier (VNI)
A 24-bit ID number that identifies a tenant segment and transmits in a VXLAN-encapsulated packet.
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794 VXLAN