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Clearing Access-Line-Identifier Interface Sets


Clear a specified dynamic access-line-identifier (ALI) interface set configured on the router.


  • To clear a specified ALI interface set that has no active members:

    For example, the following command clears the ALI interface set named ari-1003-ge-1/0/0.4001:


When configured to do so, the router dynamically creates an ALI interface set when the first DHCP or PPPoE subscriber from a particular household logs in. However, the router does not automatically delete the ALI interface set when the last subscriber from that household logs out. As a result, you must use the clear auto-configuration interfaces interface-set command to explicitly clear the ALI interface set when it no longer has any active subscriber interface members. If you attempt to clear an ALI interface that still has active member interfaces, the router displays an error message and rejects the command.

When you specify the name of the ALI interface set to be cleared, you must use the ALI interface set name internally generated by the router, and not the actual ALI string carried in DHCP and PPPoE control packets. The router uses the following format to name ALI interface sets:



  • trusted-option is a prefix identifying the access-line identifier that was configured to be accepted and which triggered creation of the interface set:

    • aci—The trusted option is the ACI.

    • ari—The trusted option is the ARI.

    • aci+ari—Both the ACI and the ARI are trusted options and both were received.

    • noids—Neither the ACI nor the ARI is configured as the trusted option and neither ACI nor ARI is received.

  • nnnn is a randomly generated 4-digit identifier; for example, 1003.

  • interface-name is the name of the dynamic subscriber interface; for example, ge-1/0/0 or demux0.

  • logical-unit-number is the logical unit number of the dynamic subscriber interface; for example, 4001.

The following are all examples of generated interface set names:

To view the names of the ALI interface sets configured on the router, use the show subscribers command.