Loop the Entire T3 Interface towards the Network

Purpose

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.

Action

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 interface-name t3-options

2. Configure the loopback:

[edit interfaces interface-name 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

What It Means

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

The interface name is one of the following:

• T1 channel 0, channel group 0, on the Multichannel DS-3 port for a channelized DS-3 to DS-0 interface (for example, ds-2/1/1:0:0)
• T1 channel 0 on the Multichannel DS-3 port for a channelized DS-3 to DS-1 interface (for example, t1-2/1/1:0)