Technical Documentation

Create a Loop from the Router to the Network


Creating a loop from a particular T1 interface to the network allows the transport-layer engineer to test the T1 interface from various points in the network and isolate the problem.


To create a loop from a particular T1 interface to the network, follow these steps:

  1. In configuration mode, go to the following hierarchy level:
    [edit]user@host# edit interfaces t1-fpc/pic/port:channel t1-options
  2. Configure the loopback:
    [edit interfaces interface-name t1-options]user@host# set loopback remote
  3. Verify the configuration:
    user@host# show

    For example:

    [edit interfaces t1-2/1/1:0:0 t1-options]user@host# show loopback remote;
  4. Commit the configuration:
    user@host# commit


This command loops any traffic from the network back into the network.

Published: 2010-01-29