No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade
Troubleshooting Guide
CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Packet Loss Occurs Because Service Traffic Is Forwarded to an Unexpected Device

Packet Loss Occurs Because Service Traffic Is Forwarded to an Unexpected Device

Problem Description

On the VXLAN network shown in Figure 19-2, server leaf nodes are CE6860EI switches. Some service traffic on the network is forwarded to an unexpected device, causing abnormal service communication.
Figure 19-3 VXLAN networking

Root Cause

MAC addresses of NVE interfaces conflict.

When a standalone switch or an M-LAG consisting of switches of the following models functions as a distributed VXLAN gateway and a MAC address is configured on the NVE interface of the gateway, the MAC address of the NVE interface must be different from the MAC addresses of NVE interfaces on other VXLAN gateways on the network. The models include the CE6850HI, CE6850U-HI, CE6851HI, CE6860EI, CE7850EI, CE8850EI, and CE8860EI.

Solution

Perform the following steps to locate and rectify the fault:

  1. Log in to the device where services are affected and run the display ip routing-table command to check whether information such as the destination address and next hop in the routing table is as expected and whether the overlay routing information is correct.
  2. Check whether the MAC addresses of NVE interfaces on VTEPs conflict.
    Run the display current-configuration interface Nve 1 command to check the MAC address of the NVE interface on each VTEP. If the MAC addresses of NVE interfaces on different nodes are the same, the problem occurs.
    <HUAWEI> display current-configuration interface Nve 1
    #                                                                               
    interface Nve1                                                                                                                  
     source 1.1.1.1                                                             
     vni 5010 head-end peer-list protocol bgp  
     mac-address 0000-5e00-0106
    #                                                                               
    return
  3. Change the conflicting MAC address of an NVE interface.
    Run the mac-address mac-address command in the NVE interface view to change the MAC address of the NVE interface. Ensure that the configured MAC address is not used on the live network.
    <HUAWEI> system-view
    [~HUAWEI] interface nve 1
    [*HUAWEI-Nve1] mac-address 0000-5e00-0101
    [*HUAWEI-Nve1] commit
  4. After the MAC address is changed, servers can communicate with each other and no packet is lost, indicating that the fault is rectified.
Translation
Download
Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 662538

Downloads: 3050

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Share
Previous Next