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Troubleshooting Guide

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

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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).
A Server Fails to Ping the Directly Connected New Gateway CE12800

A Server Fails to Ping the Directly Connected New Gateway CE12800

Fault Symptom and Networking

As shown in the following figure, the new and old gateway IP addresses are both 10.3.2.1/24, and the server IP address is 10.3.2.16/24.



During migration, the shutdown command is executed on the VLANIF interface of the to-be-migrated gateway R1, and the undo shutdown command is executed on the corresponding VLANIF interface of the new gateway CE12800. As a result, the server fails to ping the CE12800.

Root Cause

The MAC address of the to-be-migrated gateway R1 is bound on the server. The server sends ICMP packets with R1's MAC address as the destination MAC address. As a result, the ping fails.

Fault Identification

  1. Ping the server address 10.3.2.16 from the CE12800. The ping operation fails.
  2. Run the display arp command on the CE12800 to check ARP entries. The device learns ARP entries and MAC addresses are correct.

    Since correct ARP entries are configured on the CE12800, ICMP packets can be correctly sent to the server. The server may not reply with ICMP packets.

  3. Run the capture-packet interface interface-type interface-number destination terminal command to obtain packets on the CE12800. The destination MAC address of ICMP packets from the server is the MAC address of the gateway where services will be migrated.
  4. Log in to the server. The server is bound to the MAC address of R1 but not the address of the gateway at 10.3.2.1.

Solution

Log in to the server and delete the binding of R1's MAC address.

Summary

Network migration involves not only replacement of the device and IP address but also cooperation among NEs. For example, the binding to MAC addresses of old devices is not allowed.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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