Technical Documentation

Configuring Loopback Interfaces for the PPPoE Layer 3 Wholesale Solution

You must configure loopback interfaces for use in the subscriber management access network. The loopback interfaces are automatically used for unnumbered interfaces.

Note: If you do not configure the loopback interface, the routing platform chooses the first interface to come online as the default. If you configure more than one address on the loopback interface, we recommend that you configure one to be the primary address to ensure that it is selected for use with unnumbered interfaces. By default, the primary address is used as the source address when packets originate from the interface.

To configure loopback interfaces:

  1. Edit the loopback interface.
    [edit]user@host# edit interfaces lo0
  2. Edit the unit for the wholesale loopback interface.
    [edit interfaces lo0]user@host# edit unit 4
  3. Edit the wholesale loopback interface family.
    [edit interfaces lo0 unit 4]user@host# edit family inet
  4. Specify the wholesale loopback interface address.
    [edit interfaces lo0 unit 4]user@host# set address 33.30.0.1/32
  5. (Optional) Specify the loopback interface address as the primary loopback interface.
    [edit interfaces lo0 unit 4]user@host# set address 33.30.0.2/32 primary
  6. Edit the unit for a retail loopback interface.
    [edit interfaces lo0]user@host# edit unit 5
  7. Edit the retail loopback interface family.
    [edit interfaces lo0 unit 5]user@host# edit family inet
  8. Specify the retail loopback interface address.
    [edit interfaces lo0 unit 5]user@host# set address 33.33.0.1/32
  9. (Optional) Specify the loopback interface address as the primary loopback interface.
    [edit interfaces lo0 unit 5]user@host# set address 33.33.0.2/32 primary
  10. Repeat steps 7 through 10 for additional retailers, making sure to use unique unit and address values for each retailer loopback interface.

Published: 2010-04-14