Configuring an Interface to Stay Down at Boot Time

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Issue

How can I disable an interface under /etc/network/interfaces running Cumulus Linux? I also want the interface stay down even after reboot.

Environment

  • Cumulus Linux 2.2.x, 2.5.x, 3.0.x - 3.2.0

Resolution

The following example applies to an interface named swp1.

  1. Shut down the interface:

    cumulus@switch$ sudo ifdown --admin-state swp1
    
  2. Disable the interface from starting at next boot by editing /etc/network/interfaces and commenting out the line auto swp1:

    cumulus@switch$ sudo nano /etc/network/interfaces
    

    Change this line:

    auto swp1
    

    to:

    # auto swp1
    

    Note: Commenting out the auto line for a logical interface such as a bridge or bond means that the interface does not get created at boot time. If using implicit built-in interfaces, those interfaces also aren't created or started at boot time.

 

Note: For Cumulus Linux 3.2.1 and later, you can use NCLU to put an interface into an admin down state. 

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