• Binds the Port and VLAN to logical networks based on messages from the NVP.
• Binds MACs to the VTEP and logical network based on messages from the NVP.
• Advertises MACs learnt on south-facing VXLAN capable-ports to the NVP client.
VXLAN Hypervisor It is the VTEP that connects the Virtual Machines (VM) to the underlay legacy network
to the physical infrastructure.
Service Node(SN) It is also another VTEP, but it is fully managed by NSX. The purpose of SN is to be the
central replication engine for flooded packets
Legacy TOR It is a TOR switch, which performs routing or switching decisions.
Functional Overview of VXLAN Gateway
The following section is the functional overview of VXLAN Gateway:
1 Provides connectivity between a Virtual server infrastructure and a Physical server infrastructure.
2 Provides the functions performed by a VTEP in a virtual server infrastructure. The functions of a VTEP are:
• VTEP is responsible for creating one or more logical networks.
• VTEP is responsible for identifying and binding a Port and VLAN to a logical network
• VTEP maintains MAC bindings to a VTEP.
• VTEP is typically managed by a network orchestrator. When the device functions as VTEP, VXLAN
from VMWare is the network orchestrator.
• VXLAN communicates with the VTEP using a standard protocol called OvsDb Protocol. The
protocol uses the JSON RPC-based message format.
• The VTEP acts according to the TOR schema defined by VMWare. The solution is very specific to
VMWare-based orchestration platforms and does not work with other orchestration platforms.
VXLAN Frame Format
VXLAN provides a mechanism to extend an L2 network over an L3 network. In short, VXLAN is an L2 overlay
scheme over an L3 network and this overlay is termed as a VXLAN segment. VMs within the same VXLAN
segment communicate with each other through a 24–bit ID called VXLAN Network Identifier (VNI). This 24–
bit ID allows up to 16 million VXLAN segments to coexist within the same administrative domain. The VNI
scopes the inner MAC frame originated by the VM. This model has over-lapping MAC addresses without
traffic cross-over
Virtual Extensible LAN (VXLAN) 1176
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