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Configuring an Underlying Interface for Dynamic PPPoE Subscriber Interfaces

1. Configure the static underlying Ethernet interface on which you want the router to dynamically create the PPPoE logical interface.

   For information about configuring static Ethernet interfaces, see the Junos® OS Network Interfaces.

2. Configure a PPPoE dynamic profile in either of the following ways:
   • To configure a basic PPPoE dynamic profile, see Configuring a Basic PPPoE Dynamic Profile.
   • To configure a PPPoE dynamic profile with additional options for subscriber access, see Configuring a PPPoE Dynamic Profile with Additional Options.

1. Specify the name and logical unit number of the static underlying Ethernet interface to which you want to attach the PPPoE dynamic profile.
   [edit]user@host# edit interfaces ge-1/0/1 unit 0
2. Configure PPPoE encapsulation on the underlying interface.
   [edit interfaces ge-1/0/1 unit 0]user@host# set encapsulation ppp-over-ether
3. Specify that you want to configure PPPoE-specific options on the underlying interface.
   [edit interfaces ge-1/0/1 unit 0] user@host# edit pppoe-underlying-options
4. Attach a previously configured PPPoE dynamic profile to the underlying interface.

   The specified PPPoE dynamic profile must already be configured on the router. In addition, you cannot attach a PPPoE dynamic profile to an underlying Ethernet interface that is already associated with static PPPoE logical interfaces. Conversely, you cannot associate static PPPoE logical interfaces with an underlying Ethernet interface that already has a PPPoE dynamic profile attached.

   [edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set dynamic-profile basic-pppoe-profile
5. (Optional) Enable duplicate protection to prevent activation of another dynamic PPPoE logical interface for the same client on the underlying interface.
   [edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set duplicate-protection
6. (Optional) Configure the maximum number of concurrent PPPoE sessions that the router can activate on the underlying interface in either of the following ways:
   • To configure the maximum number of concurrent PPPoE sessions on a per-interface basis, from 1 to the platform-specific default for your router, use the max-sessions statement:
     [edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set max-sessions 20
   • To configure the maximum number of concurrent PPPoE sessions on a per-subscriber basis, use the value returned by RADIUS in the Max-Clients-Per-Interface Juniper Networks vendor-specific attribute (VSA) [26-143]. By default, the PPPoE maximum session value returned by RADIUS in the Max-Clients-Per-Interface VSA takes precedence over the PPPoE maximum session value configured with the max-sessions statement.
7. (Optional) Configure the router to ignore the value returned by RADIUS in the Max-Clients-Per-Interface VSA and restore the PPPoE maximum session value on the underlying interface to the value configured in the CLI with the max-sessions statement.
   [edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set max-sessions-vsa-ignore

8. (Optional) Enable PPPoE subscriber session lockout on the PPPoE underlying interface in either of the following ways:

   • To configure PPPoE subscriber session lockout with the default lockout period:
     [edit interfaces interface-name unit logical-unit-number pppoe-underlying-options] user@host# set short-cycle-protection
   • To configure PPPoE subscriber session lockout with a nondefault lockout period:
     [edit interfaces interface-name unit logical-unit-number pppoe-underlying-options] user@host# set short-cycle-protection lockout-time-min minimum-seconds lockout-time-max maximum-seconds

   Best Practice: When you configure PPPoE subscriber session lockout, we recommend that you also enable duplicate protection to ensure that the MAC source address for each PPPoE session is unique on the underlying interface.

9. (Optional) Specify the alternative name for the access concentrator, also known as the PPPoE server.
   [edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set access-concentrator server-east