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Bringing a link down via CLI.

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  • 1.  Bringing a link down via CLI.

     
    Posted 02-02-2021 01:08
    Hi .

    Assuming my GE port has a healthy cable plugged into it, is there any way I can bring the 'Link' column to say down instead of up? 

    lab@vSRX-1> show interfaces ge-0/0/0 terse
    Interface      Admin Link      Proto     Local      Remote
    ge-0/0/0              up    up

    I configured the port for half duplex and the 'Link' remained up. 

    Thanks,
    Deepak


  • 2.  RE: Bringing a link down via CLI.

     
    Posted 02-02-2021 03:40
    Hello Deepak,

    you can bring down the port with "set interfaces ge-0/0/0 disable"

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  • 3.  RE: Bringing a link down via CLI.

     
    Posted 02-02-2021 04:08
    Thanks F1ght3r.

    Can auto-negotiation failure bring a link down in the same way? That's what I'm currently trying to do.

    Thanks,
    Deepak


  • 4.  RE: Bringing a link down via CLI.

     
    Posted 02-02-2021 04:21
    Hello Deepak,

    this depends on the device, some devices bring the link down if Autoneg fails, some not. So bringing the interface down by changing the Autoneg status is not a reliable method.

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  • 5.  RE: Bringing a link down via CLI.
    Best Answer

     
    Posted 02-02-2021 11:49
    Only the second column, with a healthy link? no.  

    You can administratively bring the interface down, with either the disable command in cli, or going to the shell and doing ifconfig down.  In either case, the interface will  show as down down

    If you configure half duplex on one end, either autonegotiation will fall back to half duplex on the other end, or you star seeing a bunch of errors on the interface statistics, as one side is half and the other is full.  But that would not bring the interface down. 

    Regards,   



  • 6.  RE: Bringing a link down via CLI.

     
    Posted 02-06-2021 00:25
    Thanks ylmva1!