Configuring an Underlying Interface for Dynamic PPPoE Subscriber Interfaces

After you configure a dynamic profile to define the attributes of a dynamic PPPoE subscriber interface, you must attach the dynamic profile to a statically created underlying Ethernet interface configured with PPPoE (ppp-over-ether) encapsulation. You configure the underlying interface at the [edit interfaces interface-name unit logical-unit-number pppoe-underlying-options] hierarchy level.

In addition to attaching the dynamic profile to the interface by using the required dynamic-profile statement, you can also configure the underlying interface with one or more of the following optional PPPoE-specific attributes:

Prevention of another dynamic PPPoE logical interface from being activated on the underlying interface when a PPPoE logical interface for a client with the same MAC address is already active on that interface (duplicate-protection)
Maximum number of dynamic PPPoE logical interfaces (sessions) that the router can activate on the underlying interface (max-sessions)
An alternative access concentrator name in the AC-NAME tag in a PPPoE control packet (access-concentrator)

Before you begin:

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 Network Interfaces Configuration Guide.
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.

To configure an underlying Ethernet interface for a dynamic PPPoE subscriber interface:

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
Configure PPPoE encapsulation on the underlying interface.
[edit interfaces ge-1/0/1 unit 0]user@host# set encapsulation ppp-over-ether
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
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
(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
(Optional) Specify the maximum number of dynamic PPPoE sessions that the router can activate on the underlying interface, from 1 to the maximum number of PPPoE sessions supported on your routing platform.
[edit interfaces ge-1/0/1 unit 0 pppoe-underlying-options] user@host# set max-sessions 20
(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

Configuring an Underlying Interface for Dynamic PPPoE Subscriber Interfaces

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