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S600-E V200R012C00 Configuration Guide - Interface Management

This document describes the interface management configuration, including basic interface configuration, Ethernet interface configuration, and logical interface configuration.
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Configuring Virtual Cable Test

Configuring Virtual Cable Test


Virtual cable test (VCT) technology uses time domain reflectometry (TDR) to detect the cable status. When pulse signals are transmitted in a cable, some energy of the signals is reflected at the end or a failure point on the cable. This phenomenon is called TDR. The VCT algorithm measures the time spent on transmitting pulse signals over a cable, reaching the failure point, and returning the pulse signals. The measured time is converted into the distance.

As shown in Figure 2-8, GE0/0/1 of SwitchA is connected to GE0/0/2 of SwitchB using a network cable. A failure point exists on the network cable. After VCT is configured on GE0/0/1, the system generates pulse signals. When the pulse signals reach the failure point, some energy is reflected to the GE0/0/1. In this example, the distance between SwitchA and the failure point is L, the period from sending pulse signals to receiving reflected pulse signals is T, and the transmission rate of pulse signals in the cable is V. The following formula is used to calculate the distance between the failure point and GE0/0/1:

L = (V x T)/2

Figure 2-8  VCT

VCT detects the network cable fault type and identifies the failure point, facilitating fault location on network cables.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run virtual-cable-test

    VCT is configured.

    • The test result is for reference only and may be inaccurate for network cables from some vendors.
    • Running the virtual-cable-test command may affect services on the interface in a short period of time, and the interface in Up state may alternate between Up and Down.
    • Before configuring VCT, shut down the remote interface or remove the network cable between the local and remote interfaces. Otherwise, signals from the remote interface may make the test result inaccurate.
    • VCT can be configured on an XGE optical interface that has a GE copper module installed.

    • VCT can be configured on a GE optical interface that has a GE copper module installed.

Verifying the Configuration

Run the display virtual-cable-test interface-type interface-number command in any view to check the latest VCT result on an Ethernet interface.

Updated: 2018-09-01

Document ID: EDOC1100037947

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