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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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VXLAN Packet Format

VXLAN Packet Format

VXLAN is a network virtualization technology that performs MAC-in-UDP encapsulation by adding a UDP header and a VXLAN header before an original Ethernet packet. Figure 3-2 shows the VXLAN packet format.

Figure 3-2 VXLAN packet format
Table 3-3 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 packet.

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.

If the underlay network is an IPv4 network, the IP address of a VTEP is an IPv4 address. If the underlay network is an IPv6 network, the IP address of a VTEP is an IPv6 address.

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: 2019-05-05

Document ID: EDOC1100004207

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