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Configuration Guide - Interface Management

S7700 and S9700 V200R010C00

This document describes the principles and configurations of interfaces and provides configuration examples.
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Configuring the IFG

Configuring the IFG

Context

An interframe gap (IFG) is used to separate two data packets, as shown in Figure 2-7. You can configure the IFG to change the packet forwarding rate on an interface, thereby adjusting the data forwarding capacity of the interface.

The packet forwarding rate, also called throughput, refers to the data forwarding capability on an interface and is measured in packet per second (pps). The packet forwarding rate is calculated based on the number of 64-byte data packets transmitted in a period. The lengths of preamble and IFG affect the packet forwarding rate.

The default IFG is the maximum value of 12 bytes and is recommended. If you set the IFG to a small value, the device will 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.

Figure 2-7  IFG

NOTE:

On the S7700, only the ES1D2L02QFC0 interface card supports the IFG configuration.

On the S9700, only the EH1D2L08QFC0 and EH1D2L02QFC0 interface cards support the IFG configuration.

Procedure

  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.

    The default IFG is 12 bytes.

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Updated: 2019-04-18

Document ID: EDOC1000141901

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