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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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A Host Fails to Ping a VXLAN Layer 3 Gateway

A Host Fails to Ping a VXLAN Layer 3 Gateway

Problem Description

In Figure 19-1, Leaf1 and Leaf2 function as VXLAN Layer 3 gateways and a VXLAN tunnel is established between them.

The VBDIF interfaces on Leaf1 and Leaf2 are Up, but Host1 or Host2 fails to ping the corresponding gateway.

Figure 19-1 Distributed VXLAN gateway networking

Root Cause

When a CE6850HI, CE6850U-HI, CE6851HI, CE6860EI, CE7850EI, CE8850EI, or CE8860EI switch functions as a VXLAN Layer 3 gateway, configure a service loopback interface on the switch to loop back service packets of the VXLAN Layer 3 gateway.

Leaf1 and Leaf2 are CE6850HI switches. Therefore, service loopback interfaces need to be configured on them.

Solution

Configure a service loopback interface on a switch functioning as a VXLAN Layer 3 gateway.
<HUAWEI> system-view
[~HUAWEI] interface eth-trunk 2
[*HUAWEI-Eth-Trunk2] service type tunnel   //Enable the service loopback function on the Eth-Trunk.
[*HUAWEI-Eth-Trunk2] trunkport 10ge 1/0/1   //Add a member interface to the Eth-Trunk.
[*HUAWEI-Eth-Trunk2] commit
  • After service loopback is enabled on an Eth-Trunk, other services cannot be configured on the Eth-Trunk and its member interfaces.
  • Ensure that the Eth-Trunk bandwidth is at least twice the bandwidth required for transmitting VXLAN Layer 3 gateway traffic. For example, if traffic is sent from users to the gateway across the VXLAN network at a rate of 10 Gbit/s, add two 10GE interface to the Eth-Trunk that you want to use as the service loopback interface.
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Updated: 2020-01-07

Document ID: EDOC1000060766

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