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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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Setting the Jumbo Frame Length Allowed on an Interface

Setting the Jumbo Frame Length Allowed on an Interface

Context

Ethernet frames longer than 1518 bytes and VLAN frames longer than 1522 bytes are called Jumbo frames.

When exchanging a large amount of data (for example, transmitting files), Ethernet interfaces may receive Jumbo frames whose length exceeds that of common packets. If the length of the received Jumbo frames 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 the Jumbo frame length allowed on an interface is adjusted, packet forwarding becomes flexible. If multiple common Ethernet frames are used to transmit a data packet, redundant information such as inter-packet gaps (IPGs) and headers is also transmitted. If Jumbo frames are used to transmit a data packet of the same length, there are fewer frames without unnecessary IPGs and headers to transmit, improving the bandwidth usage.

However, the Jumbo frame lengths allowed on interfaces cannot be all set to the maximum. During transmission of a packet, each device that the packet passes though needs to support forwarding of Jumbo frames; otherwise, the packet is discarded during forwarding. After an interface receives protocol packets such as VXLAN, TRILL, and VLAN packets, the chip encapsulates packet headers containing certain bytes to the packets. As a result, the length of the outgoing packets may exceed that of the incoming packets. Therefore, you need to consider the packet header length when configuring the maximum frame length allowed by an interface, preventing packets from being discarded because the packet length exceeds the maximum frame length.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run jumboframe enable value1 [ value2 ]

    The maximum length of a jumbo frame and the maximum length of a non-jumbo frame allowed by an interface is set.

    By default, the maximum frame length allowed by an interface is 9216 bytes and the maximum length of a non-jumbo frame allowed by an interface is 1518 bytes.

    CE-L48GS and CE-L48GT series cards do not support parameter value2.

    CE12800E does not support parameter value2.

    For jumbo frame configurations in the Eth-Trunk interface view:
    • The configurations take effect for all member interfaces. When an interface is added to the Eth-Trunk, the interface inherits jumbo frame configurations on the Eth-Trunk. When a member interface is removed from the Eth-Trunk, default jumbo frame configurations of the interface are restored.

    • If Eth-Trunk member interfaces do not support the value2 parameter, the value2 parameter cannot be configured in the Eth-Trunk interface view.

    • For the CEL48GTEGA-E card, the value of the value1 parameter must be a multiple of 8. When the Eth-Trunk has member interfaces, the value of the value1 parameter configured in the Eth-Trunk interface view must also be a multiple of 8.

    • For a switch running V200R003C00SPC100 or an earlier version, Eth-Trunk member interfaces support jumbo frame configurations. After the switch is upgraded to V200R003C00SPC200 or a later version, Eth-Trunk member interfaces do not support jumbo frame configurations.
      • If jumbo frame parameters are configured on an Eth-Trunk member interface of a switch running a version earlier than V200R003C00SPC200, the Eth-Trunk inherits jumbo frame configurations on the Eth-Trunk member interface after the switch is upgraded to V200R003C00SPC200 or a later version, for example, the maximum number of jumbo frames on the Eth-Trunk is changed to that on the Eth-Trunk member interface and the maximum number of non-jumbo frames is changed to that on the Eth-Trunk member interface.
      • If jumbo frame parameters are configured on the Eth-Trunk of a switch running V200R003C00SPC200 or a later version, jumbo frame configurations on the Eth-Trunk disappear after the switch is downgraded to a version earlier than V200R003C00SPC200. You need to independently reconfigure jumbo frame parameters on Eth-Trunk member interfaces.
    • For physical member interfaces of an Eth-Trunk, if the value range after the upgrade is smaller than that before the upgrade, set the jumbo frame length of the Eth-Trunk to a value within the normal range after the upgrade; otherwise, physical member interfaces cannot be added to the Eth-Trunk after the upgrade.

  4. Run commit

    The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004195

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