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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 Training Function

Configuring the Training Function

Context

With the increase of transmission rate or frequency, attenuation of signal's high-frequency components becomes increasingly severe. To guarantee transmission performance of signals, it is necessary to compensate for signals, and commonly used compensation technologies are pre-emphasis and balancing. The pre-emphasis technology increases high-frequency components of signals at the transmitter end of transmission lines to compensate attenuation during the transmission. However, the pre-emphasis technology increases crosstalk while amplifying high-frequency components. To solve this problem, the balancing technology is developed. The balancing technology is used at the receiver end of transmission lines to function like a filter for filtering high-frequency crosstalk.

After the training function is enabled on an interface, the transmitter end exchanges frames with the receiver end to automatically set the pre-emphasis and balancing parameters, improving process efficiency of the two technologies. Note that the negotiated parameters for the training function are obtained based on the site environment. If the site environment changes, for example, from high-temperature environment to low-temperature environment, the parameters may be inaccurate. Therefore, error codes may occur when the training function is enabled. The training function is optional in IEEE802.3 standards, and its implementation on different types of products from various vendors may differ. When connecting two devices, ensure that the training function must be enabled or disabled on both ends simultaneously.

The following interfaces support the training disable configuration:
  • A 40GE interface connecting to or pre-configured with a 40GE high-speed cable
  • A QSFP28 interface connecting to or pre-configured with a 40GE high-speed cable
  • A QSFP28 interface connecting to a 100GE high-speed cable and configured with the speed 40000 command to work at the rate of 40 Gbit/s

40GE or QSFP28 interfaces on the following cards do not support the training disable configuration: CEL36LQ-E series, CEL16CQEG-E, CE-L36LQ-FD, CE-L24LQ-FD, CE-L36CQ-FD, CE-L12CQ-FD, CE-L36CQ-FG, CE-L16CQ-FD, CE-L08CF-FG1 and CE-L48XS-FDA.

NOTE:
  • The training function must be enabled on interfaces at both ends of a link; otherwise, the interfaces cannot work properly.
  • The training function takes effect on an interface only when the interface works in auto-negotiation mode. If you run the negotiation disable command to configure the interface to work in non-auto-negotiation mode after the training function takes effect, the training function will become ineffective.

  • If a 40GE interface is configured as a physical member interface in a stack system, the training function cannot be disabled. In V100R003C10 and earlier versions, if the training function is disabled on a 40GE interface, the 40GE interface cannot be configured as a physical member interface in a stack system. In V100R005 and later versions, if a 40GE interface is configured as a physical member interface in a stack system, the training disable configuration will be automatically deleted from the interface.
In V100R001C00, V100R002C00, and V100R003C00SPC100, the training function is disabled on an interface by default. Pay attention to the following points:
  • If you upgrade a device from V100R001C00, V100R002C00, or V100R003C00SPC100 to a later version, the training function is enabled on an interface by default. To ensure that the interface configuration remains unchanged, the device automatically generates the training disable configuration on the interface to disable the training function. You can install or preconfigure a transmission medium that supports the training function on the interface, and run the undo training disable command to enable the training function.
  • If you roll back a device from V100R003C00SPC500 or a later version to V100R001C00, V100R002C00, or V100R003C00SPC100, and the training function is enabled on an interface and the interface is in Up state before the version rollback, the interface cannot go Up after the version rollback.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run training disable

    The training function is disabled on the interface.

    By default, the training function is enabled.

  4. Run commit

    The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004195

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