ZyXEL Communications XS3800-28, User Manual, Page: 344 / 789

Chapter 47 PPPoE
XS3800-28 User’s Guide
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47
PPPoE
47.1 PPPoE Intermediate Agent Overview
This chapter describes how the Switch gives a PPPoE termination server additional information that the
server can use to identify and authenticate a PPPoE client.
A PPPoE Intermediate Agent (PPPoE IA) is deployed between a PPPoE server and PPPoE clients. It helps
the PPPoE server identify and authenticate clients by adding subscriber line specific information to
PPPoE discovery packets from clients on a per-port or per-port-per-VLAN basis before forwarding them
to the PPPoE server.
47.1.1 What You Can Do
• Use the PPPoE Intermediate Agent screen ( Section 47.2 on page 346 ) to enable the PPPoE
Intermediate Agent on the Switch.
• Use the PPPoE IA Port screen ( Section 47.3 on page 348 ) to set the port state and configure PPPoE
intermediate agent sub-options on a per-port basis.
• Use the PPPoE IA Port VLAN screen ( Section 47.4 on page 350 ) to configure PPPoE IA settings that
apply to a specific VLAN on a port.
• Use the PPPoE IA VLAN ( Section 47.5 on page 352 ) to enable the PPPoE Intermediate Agent on a
VLAN.
47.1.2 What You Need to Know
Read on for concepts on ARP that can help you configure the screen in this chapter.
47.1.2.1 PPPoE Intermediate Agent Tag Format
If the PPPoE Intermediate Agent is enabled, the Switch adds a vendor-specific tag to PADI (PPPoE
Active Discovery Initialization) and PADR (PPPoE Active Discovery Request) packets from PPPoE clients.