Chapter 34 PPPoE
XGS4600 Series User’s Guide
347
CHAPTER 34
PPPoE
34.1 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.
34.1.1 What You Can Do
• Use the PPPoE screen (Section 34.2 on page 349) to display the main PPPoE screen.
• Use the Intermediate Agent screen (Section 34.3 on page 350) to enable the PPPoE Intermediate
Agent on the Switch.
• Use the PPPoE IA Per-Port screen (Section 34.3.1 on page 351) to set the port state and configure
PPPoE intermediate agent sub-options on a per-port basis.
• Use the PPPoE IA Per-Port Per-VLAN screen (Section 34.3.2 on page 353) to configure PPPoE IA settings
that apply to a specific VLAN on a port.
• Use the PPPoE IA for VLAN (Section 34.3.3 on page 354) to enable the PPPoE Intermediate Agent on a
VLAN.
34.1.2 What You Need to Know
Read on for concepts on ARP that can help you configure the screen in this chapter.
34.1.2.1 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.
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