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Configuring Dynamic Subscriber Interfaces Using IP Demux Interfaces in Dynamic Profiles

You can configure dynamic subscriber interfaces using IP demux interfaces.

To enable the dynamic demux interface to be created by DHCP, you configure the demux options in a dynamic profile. Dynamic profiles enable you to dynamically apply configured values (including CoS, IGMP, or filter configuration) to the dynamic interfaces, making them easier to manage.

Note:

Only demux0 is supported. If you configure another demux interface, such as demux1, the configuration commit fails.

Before you begin:

To configure dynamic subscriber interfaces:

  1. Specify that you want to configure the demux0 interface in the dynamic profile.
  2. Configure the unit for the demux0 interface.
    1. Configure the variable for the unit number of the demux0 interface.

      The variable is dynamically replaced with the unit number that DHCP supplies when the subscriber logs in.

    2. Configure the variable for the underlying interface of the demux interfaces and specify the $junos-underlying-interface variable.

      The variable is dynamically replaced with the underlying interface that DHCP supplies when the subscriber logs in.

    3. (Optional) To improve data path performance for DHCPv4 subscribers, specify that only subscribers with 32-bit prefixes are allowed to come up on the interface.
      Note:

      This step requires that you specify the demux-source as inet.

  3. Configure the family for the demux interfaces.
    1. Specify that you want to configure the family.

      For IPv4:

      For IPv6:

    2. Configure the unnumbered address for the family.
    3. Configure the variable for the IP address of the demux interface.

      The variable is dynamically replaced with the IP address that DHCP supplies when the subscriber logs in. For IPv4, use $junos-subscriber-ip-address, For IPv6, use $junos-subscriber-ipv6-address. For IPv6 multiple address support, use $junos-subscriber-ipv6-multi-address.

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