Understanding PPPoE Interfaces


The device’s Point-to-Point Protocol over Ethernet (PPPoE) interface to the access concentrator can be a Fast Ethernet interface, a Gigabit Ethernet interface, a redundant Ethernet interface, an ATM-over-ADSL interface, or an ATM-over-SHDSL interface. The PPPoE configuration is the same for all interfaces. The only difference is the encapsulation for the underlying interface to the access concentrator:

  • If the interface is Ethernet, use a PPPoE encapsulation.

  • If the interface is ATM-over-ADSL or ATM-over-SHDSL, use a PPPoE over ATM encapsulation.

To configure a PPPoE interface, you create an interface with a logical interface unit 0, then specify a logical Ethernet or ATM interface as the underlying interface for the PPPoE session. You then specify other PPPoE options, including the access concentrator and PPPoE session parameters.


PPPoE over redundant Ethernet (reth) interface is supported on SRX100, SRX210, SRX220, SRX240, SRX300, SRX320, SRX340 and SRX650 devices. (Platform support depends on the Junos OS release in your installation.) This feature allows an existing PPPoE session to continue without starting a new PPP0E session in the event of a failover.