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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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Setting the Jumbo Frame Length Allowed on an Interface

Setting the Jumbo Frame Length Allowed on an Interface

Context

A jumbo frame is an Ethernet frame longer than 1518 bytes or a VLAN frame longer than 1522 bytes.

When transmitting a large amount of data (such as files and videos), an Ethernet interface may receive jumbo frames. If the jumbo frame length exceeds the default data frame length that can be processed, the device directly discards the jumbo frames. You can set the jumbo frame length allowed on an interface.

After you configure the device to allow jumbo frames, packet forwarding becomes more flexible. If multiple common Ethernet frames are used to transmit a data packet, many redundant contents such as interframe gaps (IFGs) and preambles are also transmitted. If jumbo frames are used to transmit the data packet, fewer frames, as well as fewer IFGs and preambles, are transmitted, improving bandwidth efficiency.

Setting the jumbo frame length to the maximum value may not be the optimal choice. When a jumbo frame is transmitted on a network, the jumbo frame length must be supported by all devices on the transmission path. Otherwise, the jumbo frame will be discarded during transmission.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The Ethernet interface view is displayed.

  3. Run:

    jumboframe enable [ value ]

    The maximum frame length allowed on the interface is set.

    By default, the maximum frame length allowed on an Ethernet interface is 9216 bytes.

    If you run the jumboframe enable command on an Ethernet interface without specifying the value parameter, the maximum jumbo frame length allowed on the interface is 9216 bytes.

    NOTE:

    IF the length of an outgoing packet exceeds the maximum frame length allowed on an interface, the interface can directly forward the packet.

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Updated: 2019-04-18

Document ID: EDOC1000141901

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