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Create a Loop from the Router to the Network

To create a loop from the router to the network, follow these steps:

  1. Loop the Entire T3 Interface towards the Network
  2. Loop a Particular T1 Channel towards the Network

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

Meaning

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 DS3 port for a channelized DS3 to DS0 interface (for example, ds-2/1/1:0:0)
  • T1 channel 0 on the Multichannel DS3 port for a channelized DS3 to DS1 interface (for example, t1-2/1/1:0)

Loop a Particular T1 Channel towards the Network

Purpose

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.

Action

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

Meaning

This command loops any traffic from the network back into the network. The interface name is one of the following:

  • Channel group 0 for the particular T1 channel on the Multichannel DS3 port for a channelized DS3 to DS3 interface (for example, ds-2/1/1:2:0)
  • Particular T1 channel on the Multichannel DS3 port for a channelized DS3 to DS1 interface (for example, t1-2/1/1:3)

Published: 2010-01-29

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