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Configuration Guide - Interface Management
CloudEngine 12800 and 12800E V200R003C00

This document describes the interface management configuration, including basic interface configuration, Ethernet interface configuration, and logical interface configuration.

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Configuring the IFG

Configuring the IFG


Inter-frame gap (IFG) is used to differentiate two data packets, as shown in Figure 2-3. You can configure the IFG to improve data packet forwarding efficiency.

The packet forwarding rate, also called throughput, refers to the data forwarding capability on an interface, in pps. The packet forwarding rate is calculated based on the number of 64-byte data packets in a certain period. The payload of the preamble and IFG affects the packet forwarding rate.

The default IFG is 12 bytes and is recommended. If you set the IFG to a small value, the device may not have enough time to receive the next frame after receiving one data frame. The packets then cannot be processed in real time, which results in packet loss. Similarly, if the length of a sent data frame exceeds 8000 bytes, it is recommended that you change the IFG to 16 bytes.

Figure 2-3 IFG


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ifg ifg-value

    The IFG is configured.


    When 25GE interfaces (including converted 25GE interfaces) on the CE-L48XS-FD1 and CE-L36CQ-FG work at the rate of 25 Gbit/s, the value of the ifg-value parameter cannot be less than 12.

    By default, the IFG is 12 bytes.

  4. Run commit

    The configuration is committed.

Updated: 2019-05-05

Document ID: EDOC1100004195

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