Technical Documentation

Loop the Entire T3 Interface Towards the Network


Creating a loop from the entire T3 interface to the network allows the transport-layer engineer to test the router from various points in the network and isolate the problem..

Note: For a list of interface types associated with the Channelized OC12 IQ interface, see the JUNOS Network Interfaces Configuration Guide.


To create a loop from the entire T3 interface to the network, follow these steps:

  1. In configuration mode, go to the following hierarchy level:
    [edit]user@host# edit interfaces t3-fpc/pic/port:channel t3-options
  2. Configure the loopback:
    [edit interfaces t3-fpc/pic/port:channel t3-options]user@host# set loopback remote
  3. Verify the configuration:
    user@host# show

    For example:

    [edit interfaces t3-2/1/1:0 t3-options]user@host# show loopback remote;
  4. Commit the configuration:
    user@host# commit


The loopback remote command loops any traffic from the network back into the network.

Published: 2010-01-29