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Virtual Extensible LAN (VXLAN) is an overlay network virtualization technology. An overlay network is a virtual network that is built on top of existing network Layer 2 and Layer 3 technologies to support elastic compute architectures. VXLAN makes it easier for network engineers to scale out a cloud computing environment while logically isolating cloud apps and tenants.
VXLAN Technology
VXLAN uses UDP-based encapsulation to tunnel Ethernet frames and transfers original data packets as tunnel payloads. With the outer UDP tunnel, inner payload data can be quickly transferred on the layer 2 and layer 3 networks. To provide the capability of broadcast domain addressing, the VXLAN technology uses layer 3 IP multicast to replace the Ethernet broadcast. Therefore, the broadcast, unknown unicast, and multicast (BUM) packets can be transferred on virtual networks through broadcasting. For more VXLAN details, please read RFC7348.
VXLAN Packets
As shown in Figure 1-1, a VXLAN packet consists of the outer encapsulation and the inner payloads.
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- The VXLAN ECMP does not need special configuration. It entirely depends on the routing ECMP. The route ECMP configure link: ECMP (Equal-Cost Multipath Routing) Configuration
- PicOS uses info from VXLAN header for hash calculation to ensure better performance.
VXLAN Mac Learning
The VTEP performs source MAC learning on the VNI as a Layer 2 switch.
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- The all remote VTEP decapsulates the packet and forwards the frame to access port.
Configure to map VLAN to VXLAN VNI Step
VxLAN supported on PicOS L2/L3 switch. To configure Step, pleae see below.
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