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Configuring Dynamic Underlying VLAN Interfaces to Use Access-Line Identifiers

After you define the access-line-identifier (ALI) interface set, you must configure the underlying VLAN interface to enable creation of dynamic VLAN subscriber interfaces based on the ALI. You can configure the underlying VLAN interface statically or dynamically.

This topic describes how to configure the underlying VLAN interface dynamically.

Before you begin:

To configure a dynamic underlying VLAN interface to use the ALI:

  1. In the dynamic profile for the underlying VLAN interface, associate the underlying VLAN interface with the line identity dynamic profile that defines the ALI interface set.

    For example, the following statement in a dynamic profile named ali-vlan-underlying-profile-demux associates the dynamic underlying VLAN interface with the dynamic profile ali-vlan-set-profile2 that defines the ALI interface set. You must use the predefined dynamic variable $junos-interface-ifd-name to represent the interface name, and $junos-interface-unit to represent the logical unit number.

  2. Configure one or more trusted options—the access-line-identifier information—that are accepted to trigger the creation of the dynamic VLAN.

    For example, the following statement specifies that only the ARI is accepted to trigger creation of the VLAN. When the ARI is not received, no VLAN is created.

The following example shows the dynamic configuration that uses these statements. This configuration enables the underlying dynamic IP demultiplexing (IP demux) VLAN interface to create dynamic subscriber interfaces based on the ARI by applying a single default ALI interface set dynamic profile (ali-vlan-set-profile2) to all households on the VLAN interface.

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