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Configuring Dynamic VLANs Based on Access-Line Identifiers

You can configure dynamic VLAN subscriber interfaces for DHCP and PPPoE subscribers based on the access-line identifier (ALI). These subscriber interfaces are also known as access-line identifier VLANs, ALI-based dynamic VLANs, or ALI dynamic VLANs. To configure these VLANs, you create an ALI interface set, which is a logical collection of subscriber interfaces that originate at the same household or on the same access-loop port, and then you reference the ALI interface set in the dynamic profile for a PPPoE or IP demultiplexing (IP demux) logical subscriber interface.

Before you begin:

  1. Configure the underlying physical interface for single-tag VLANs or stacked (dual-tag) VLANs.

    See the following topics:

  2. Create a dynamic profile that defines the logical subscriber interface.

    See the following topics:

To configure a dynamic VLAN subscriber interface based on the ALI:

  1. Configure a dynamic profile that defines the dynamic ALI interface set.

    See Defining Access-Line-Identifier Interface Sets.

  2. (Optional) In the dynamic profile for the ALI interface set, configure the router to use the Actual-Data-Rate-Downstream VSA [26-130] or Access-Loop-Encapsulation VSA [26-144] value in PPPoE control packets to adjust CoS shaping-rate and overhead-accounting attributes at a per-household level.

    See Adjusting the CoS Shaping Rate and Overhead Accounting Parameters for Dynamic VLANs Based on Access-Line Identifiers.

  3. Dynamically or statically configure the underlying VLAN logical interface to enable dynamic subscriber interface creation based on the ALI.
  4. Associate the dynamic ALI interface set with the dynamic PPPoE or dynamic IP demux logical subscriber interface.

    See Configuring Dynamic VLAN Subscriber Interfaces Based on Access-Line Identifiers.

  5. (Optional) In the dynamic profile for the PPPoE (pp0) subscriber interface, configure the router to use the Actual-Data-Rate-Downstream VSA [26-130] or Access-Loop-Encapsulation VSA [26-144] value in PPPoE control packets to adjust CoS shaping-rate and overhead-accounting attributes at a per-subscriber level.

    See Adjusting the CoS Shaping Rate and Overhead Accounting Parameters for Dynamic VLANs Based on Access-Line Identifiers.

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