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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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VXLAN Packet Format

VXLAN Packet Format

VXLAN is a network virtualization technology that uses the MAC-in-UDP mode to encapsulate packets. That is, VXLAN adds a UDP header and a VXLAN header to an Ethernet frame. Figure 6-2 shows the VXLAN packet format.

Figure 6-2  VXLAN packet format

  • VXLAN header

    • Flags (8 bits): The value is 00001000.
    • VNI (24 bits): used to identify a VXLAN segment.
    • Reserved fields (24 bits and 8 bits): must be set to 0.
  • Outer UDP header

    The destination UDP port number is 4789. The source port number is the hash value calculated using parameters in the inner Ethernet frame header.

  • Outer IP header

    In the outer IP header, the source IP address is the IP address of the VTEP where the sender VM resides; the destination IP address is the IP address of the VTEP where the destination VM resides.

  • Outer Ethernet header

    • SA: specifies the MAC address of the VTEP where the sender VM resides.
    • DA: specifies the next-hop MAC address in the routing table of the VTEP where the destination VM resides.
    • 802.1Q Tag (optional): specifies the VLAN tag of packets.
    • Ethernet Type: specifies the type of the Ethernet frame. The value of this field is 0x0800 when the packet type is IP.
Updated: 2019-05-25

Document ID: EDOC1000097279

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