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Configuring a PPPoE Dynamic Profile for Use with NDRA in a Dual-Stack Network

1. Create and name the dynamic profile.
   [edit]user@host# edit dynamic profiles PPPOE-dyn-ipv4v6-ndra
2. If you are using routing instances, add a routing instance to the profile and add an interface to the routing instance.
   • Specify the $junos-routing-instance variable for the routing instance. The routing instance variable is dynamically replaced with the routing instance the accessing subscriber uses when connecting to the BNG.
   • Specify the $junos-interface-name variable for the interface. The interface variable is dynamically replaced with the interface that the accessing subscriber uses when connecting to the BNG.
   [edit dynamic profiles PPPOE-dyn-ipv4v6-ndra]user@host# set routing-instances $junos-routing-instance interface $junos-interface-name
3. Add a PPPoE logical interface (pp0) to the profile, and specify $junos-interface-unit as the predefined variable to represent the logical unit number for the interface. The variable is dynamically replaced with the actual unit number supplied by the network when the subscriber logs in.
   [edit dynamic profiles PPPOE-dyn-ipv4v6-ndra]user@host# edit interfaces pp0 unit $junos-interface-unit

4. Configure the IPv4 family for the pp0 interface as follows:

   • If you are not using routing instances, assign an unnumbered address. The unnumbered address enables the local address to be derived from the specified interface and allows IP processing on the interface without assigning an explicit IP address to the interface.

     For example:

     [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set family inet unnumbered-address lo0.0
   • If you are using routing instances, assign the predefined variable $junos-loopback-interface.

     For example:

     [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set family inet unnumbered-address $junos-loopback-interface
5. Configure the IPv6 family for the pp0 interface, and assign $junos-ipv6-address as the predefined variable. Use this variable when you are using router advertisement with or without routing instances. This variable is replaced with the IPv6 address of the interface used for router advertisements.
   [edit dynamic profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set family inet6 address $junos-ipv6-address
6. Specify $junos-underlying-interface as the predefined variable to represent the name of the underlying Ethernet interface on which the router creates the dynamic PPPoE logical interface. The variable is dynamically replaced with the actual name of the underlying interface.
   [edit dynamic profiles PPPOE-dyn-ipv4v6-ndra pp0 interfaces pp0 unit "$junos-interface-unit"]user@host# set pppoe-options underlying-interface $junos-underlying-interface
7. Define the router to act as a PPPoE server when a PPPoE logical interface is dynamically created.
   [edit dynamic profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set pppoe-options server
8. (Optional) Configure the PPP authentication protocol that is used to identify and authenticate the CPE. Specify either chap or pap (or both).
   [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set ppp-options chap user@host# set ppp-options pap
9. (Optional) Enable keepalives and set an interval for keepalives. We recommend an interval of 30 seconds. For example:
   [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra interfaces pp0 unit "$junos-interface-unit"]user@host# set keepalives interval 30

10. Configure the router advertisement protocol.

    1. Access the router advertisement configuration.
       [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra]user@host# edit protocols router-advertisement
    2. Specify the interface on which the NDRA configuration is applied. Assign $junos-interface-name as the predefined variable. The variable is replaced with the actual name of the interface.
       [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra protocols router-advertisement]user@host# edit interface $junos-interface-name
    3. Specify a prefix value contained in router advertisement messages sent to the CPE on interfaces created with this dynamic profile.

       If you specify the $junos-ipv6-ndra-prefix predefined variable, the actual value is obtained from a local pool or through AAA.

       [edit dynamic-profiles PPPOE-dyn-ipv4v6-ndra protocols router-advertisement]user@host# set prefix $junos-ipv6-ndra-prefix