ZyXEL Communications XS1930-10, User Manual

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XS1930 Series User’s Guide
218
C
HAPTER
28
PPPoE
28.1 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.
28.1.1 What You Can Do
• Use the PPPoE screen ( Section 28.2 on page 220 ) to display the main PPPoE screen.
• Use the Intermediate Agent screen ( Section 28.3 on page 221 ) to enable the PPPoE Intermediate
Agent on the Switch.
• Use the PPPoE IA Per-Port screen ( Section 28.3.1 on page 222 ) 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 28.3.2 on page 223 ) to configure PPPoE IA settings
that apply to a specific VLAN on a port.
• Use the PPPoE IA for VLAN ( Section 28.3.3 on page 224 ) to enable the PPPoE Intermediate Agent on a
VLAN.
28.1.2 What You Need to Know
Read on for concepts on ARP that can help you configure the screen in this chapter.
28.1.2.1 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.
This tag is defined in RFC 2516 and has the following format for this feature.
Table 102 PPPoE Intermediate Agent Vendor-specific Tag Format
Tag_Type
(0x0105)
Tag_Len Value i1 i2