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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 Standards

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.

• Configure VXLAN soure interface

  Code Block
  set vxlans source-interface loopback address 10.10.10.25 commit

  
  

• Create VXLAN VNI

  Code Block
  set vxlans vni 10010 commit

  
  

• Configure vtep address for VXLAN VNI

  Code Block
  set vxlans vni 10010 flood vtep 10.10.10.12 commit

  Enable VXLAN VNI map with vlan

  Code Block
  set vxlans vni-map-vlan true commit

  
  

• Add vlan into VXLAN VNI

  Code Block
  set vxlans vni 10010 vlan 100 commit

  
  

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