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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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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).
Why Traffic Forwarding Fails When Interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F Interface Cards Are Added to an MP-Group and the Maximum MTU of the Interfaces Is Set to 1596 Bytes?

Why Traffic Forwarding Fails When Interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F Interface Cards Are Added to an MP-Group and the Maximum MTU of the Interfaces Is Set to 1596 Bytes?

After interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards are added to an MP-Group, the interfaces add a 4-byte MP packet header to a 1596-byte IP packet before sending it. As a result, the total packet length exceeds the maximum MTU of the interfaces, 1596 bytes. Consequently, traffic forwarding fails.

In this scenario, you are advised to set the MTU of the interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards to 1592 bytes.

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Updated: 2019-05-10

Document ID: EDOC1000079719

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