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NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access
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VXLAN Packet Format

VXLAN Packet Format

VXLAN is a network virtualization technique that uses MAC-in-UDP encapsulation by adding a UDP header and a VXLAN header before an original Ethernet packet.

Figure 15-4 shows the specific VXLAN packet format.

Figure 15-4 VXLAN packet detailed format
Table 15-2 Fields in the VXLAN packet format

Field

Description

VXLAN header

  • VXLAN Flags (8 bits): The value is 00001000.
  • VNI (24 bits): VXLAN Segment ID or VXLAN Network Identifier used to identify a VXLAN segment.
  • Reserved fields (24 bits and 8 bits): must be set to 0.

Outer UDP header

  • DestPort: destination port number, which is 4789 for UDP.
  • Source Port: source port number, which is calculated by performing the hash operation on the inner packets.

Outer IP header

  • IP SA: source IP address, which is the IP address of the local VTEP of a VXLAN tunnel.
  • IP DA: destination IP address, which is the IP address of the remote VTEP of a VXLAN tunnel.

Outer Ethernet header

  • MAC DA: destination MAC address, which is the MAC address mapped to the next-hop IP address based on the destination VTEP address in the routing table of the VTEP on which the VM that sends packets resides.
  • MAC SA: source MAC address, which is the MAC address of the VTEP on which the VM that sends packet resides.
  • 802.1Q Tag: VLAN tag carried in packets. This field is optional.
  • Ethernet Type: Ethernet packet type.
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Updated: 2019-01-02

Document ID: EDOC1100058405

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