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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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(Optional) Configuring the Layer 3 VXLAN Gateway to Work in Non-loopback Mode

(Optional) Configuring the Layer 3 VXLAN Gateway to Work in Non-loopback Mode

Context

By default, a Layer 3 VXLAN gateway works in loopback mode. That is, the Layer 3 VXLAN gateway first loops back VXLAN-encapsulated packets, and then forwards the packets. In this situation, traffic transmitted over the VXLAN tunnel cannot be forwarded at line speed when the traffic volume is heavy.

To solve the preceding problem, configure the Layer 3 VXLAN gateway to work in non-loopback mode.
  • Layer 2 non-loopback mode: The device determines whether to loop back the received packets according to the destination MAC address in the inner Ethernet header of VXLAN packets where the received packets are encapsulated. If the destination MAC address is not the MAC address of the Layer 3 VXLAN gateway, the device directly forwards the packets at line speed.
  • Layer 3 non-loopback mode: The device determines whether to loop back the received packets according to the destination MAC address in the inner Ethernet header of VXLAN packets where the received packets are encapsulated. If the destination MAC address is the MAC address of the Layer 3 VXLAN gateway, the device directly forwards the packets at line speed.
NOTE:
  • CE12800E does not support the command, and the device uses the non-loopback mode by default.

  • GE interface cards do not support the Layer 2 and Layer3 non-loopback modes. Among non-GE interface cards, EA series cards support only the Layer 2 non-loopback mode, and other series cards support Layer 2 and Layer 3 non-loopback modes.

  • Traffic will be interrupted when you change the enhanced mode of a Layer 3 VXLAN gateway. Therefore, you are advised to change the enhanced mode of a Layer 3 VXLAN gateway when there is little or no traffic on the network.

  • In loopback mode, a VXLAN tunnel, VLANs, and BDs share broadcast domain forwarding resources on the chip. (The VXLAN tunnel occupies two forwarding resources. Each VLAN or BD occupies one forwarding resource.)

    If the hwBoardResThresholdExceed alarm is generated when a VXLAN tunnel is deployed and the VXLAN tunnel cannot forward traffic, delete two VLANs or BDs. The hwBoardResThresholdExceed alarm indicates that broadcast domain forwarding resources are insufficient and the alarm description is "Fail to apply layer2 forwarding resources because of limitation of broadcast domain." The VXLAN tunnel can properly forward traffic only after the alarm is cleared.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run assign forward nvo3-gateway enhanced { l2 | l3 }

    The Layer 3 VXLAN gateway is configured to work in non-loopback mode.

    By default, the enhanced mode of the Layer 3 VXLAN gateway is not set and the switch works in loopback mode.

    NOTE:

    When you set the enhanced mode of the VXLAN gateway to Layer 3 non-loopback, you also need to run the assign forward nvo3 service extend enable command to enable the VXLAN service extension function. In this case, ensure that the switch does not have CE-L48GT-EA, CE-L48GT-EC, CE-L48GS-EA, CE-L48GS-EC, CE-L24XS-BA, CE-L24XS-EA, CE-L48XS-BA, CE-L48XS-EA and CE-L24LQ-EA cards installed, or the CE-L48GT-EA, CE-L48GT-EC, CE-L48GS-EA, CE-L48GS-EC, CE-L24XS-BA, CE-L24XS-EA, CE-L48XS-BA, CE-L48XS-EA and CE-L24LQ-EA cards do not transmit the VXLAN service, or these cards do not forward traffic transmitted over a VXLAN tunnel.

  3. Run commit

    The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004207

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