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Configure a Local Loopback

Action

To configure a local loopback without physically connecting the transmit port to the receive port, follow these steps:

  1. In configuration mode, go to the following hierarchy level:
    [edit]user@host# edit interfaces interface-name (fastether-options | gigether-options)
  2. Configure the local loopback:
    [edit interfaces interface-name (fastether-options | gigether-options)] user@host# set loopback
  3. Verify the configuration:
    user@host# show

    For example:

    [edit interfaces fe-1/0/0 fastether-options]user@host# show loopback;
  4. Commit the change:
    user@host# commit

    For example:

    [edit interfaces fe-1/0/0 fastether-options]user@host# commit commit complete

When you create a local loopback, you create an internal loop on the interface being tested. A local loopback loops the traffic internally on that PIC. A local loopback tests the interconnection of the PIC but does not test the transmit and receive ports. On an Ethernet interface, you cannot create a remote loopback, therefore there is no option to use a local or remote statement. Simply including the loopback statement at the [edit interfaces interface-name (fastether-options | gigether-options] hierarchy level, places the interface into local loopback mode.

Note: Remember to delete the loopback statement after completing the test.


Published: 2010-01-29

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