ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 29 PPPoE
GS1920v2 Series User’s Guide
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PPPo E
29.1 PPPo E Inte rm e dia te Ag e nt O ve rvie w
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.
29.1.1 Wha t Yo u C a n Do
• Use the
PPPo E
screen ( Section 29.2 on page 268 ) to display the main PPPoE screen.
• Use the
Inte rm e dia te Ag e nt
screen ( Section 29.3 on page 269 ) to enable the PPPoE Intermediate
Agent on the Switch.
• Use the
PPPo E IA Pe r- Po rt
screen ( Section 29.3.1 on page 270 ) to set the port state and configure
PPPoE intermediate agent sub-options on a per-port basis.
• Use the
PPPo E IA Pe r- Po rt Pe r- VLAN
screen ( Section 29.3.2 on page 271 ) to configure PPPoE IA settings
that apply to a specific VLAN on a port.
• Use the
PPPo E IA fo r VLAN
( Section 29.3.3 on page 272 ) to enable the PPPoE Intermediate Agent on a
VLAN.
29.1.2 Wha t Yo u Ne e d to Kno w
Read on for concepts on ARP that can help you configure the screen in this chapter.
29.1.2.1 PPPo E Inte rm e dia te Ag e nt Ta g Fo rm a t
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 115 PPPoE Intermediate Agent Vendor-specific Tag Format
Tag_Type
(0x0105)
Tag_Len Value i1 i2