ZyXEL Communications MES3500-24F User Manual

 Chapter 31 PPPoE

MES3500-24/24F User’s Guide

Trusted ports are connected to PPPoE servers. 

• If a PADO (PPPoE Active Discovery Offer), PADS (PPPoE Active Discovery Session-confirmation), 

or PADT (PPPoE Active Discovery Terminate) packet is sent from a PPPoE server and received on 
a trusted port, the Switch forwards it to all other ports.

• If a PADI or PADR packet is sent from a PPPoE client but received on a trusted port, the Switch 

forwards it to other trusted port(s).

Note: The Switch will drop all PPPoE discovery packets if you enable the PPPoE 

intermediate agent and there are no trusted ports.

Untrusted ports are connected to subscribers. 

• If a PADI, PADR, or PADT packet is sent from a PPPoE client and received on an untrusted port, 

the Switch adds a vendor-specific tag to the packet and then forwards it to the trusted port(s).

• The Switch discards PADO and PADS packets which are sent from a PPPoE server but received on 

an untrusted port.

Use this screen to configure the PPPoE Intermediate Agent on the Switch.

Click Advanced Application > PPPoE in the navigation panel to display the screen as shown. 
Click Click Here to go to the Intermediate Agent screen.

Advanced Application > PPPoE Intermediate Agent 

Use this screen to configure the Switch to give a PPPoE termination server additional subscriber 
information that the server can use to identify and authenticate a PPPoE client.