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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 sonet-options
2. Configure the local loopback:
   [edit interfaces interface-name sonet-options]user@host# set loopback local
3. Verify the configuration:
   user@host# show

   For example:

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

   For example:

   [edit interfaces so-1/0/0 sonet-options]user@host# commit commit complete

Meaning

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.

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