GS2210 Series User’s Guide
265
C
H A P T E R
2 9
PPPoE
29.1 PPPoE Intermediate Agent Overview
This chapt er descr ibes how t he Sw it ch gives a PPPoE t er m inat ion ser ver addit ional infor m at ion t hat
t he ser ver can use t o ident ify and aut hent icat e a PPPoE client .
A PPPoE I nt er m ediat e Agent ( PPPoE I A) is deployed bet ween a PPPoE ser ver and PPPoE client s. I t
helps t he PPPoE ser ver ident ify and aut hent icat e client s by adding subscr iber line specific
infor m at ion t o PPPoE discover y packet s fr om client s on a per- por t or per- por t - per- VLAN basis
befor e for war ding t hem t o t he PPPoE ser ver.
29.1.1 What You Can Do
•
Use t he PPPoE scr een (
) t o display t he m ain PPPoE scr een.
•
Use t he I n t e r m e dia t e Age n t scr een (
) t o enable t he PPPoE
I nt er m ediat e Agent on t he Sw it ch.
•
Use t he PPPoE I A Pe r - Por t scr een (
) t o set t he por t st at e and
configur e PPPoE int er m ediat e agent sub- opt ions on a per- por t basis.
•
Use t he PPPoE I A Pe r - Por t Pe r - V LAN scr een (
) t o configur e PPPoE
I A set t ings t hat apply t o a specific VLAN on a por t .
•
Use t he PPPoE I A for V LAN (
) t o enable t he PPPoE I nt er m ediat e
Agent on a VLAN.
29.1.2 What You Need to Know
Read on for concept s on ARP t hat can help you configur e t he scr een in t his chapt er.
29.1.2.1 PPPoE Intermediate Agent Tag Format
I f t he PPPoE I nt er m ediat e Agent is enabled, t he Sw it ch adds a vendor - specific t ag t o PADI ( PPPoE
Act ive Discover y I nit ializat ion) and PADR ( PPPoE Act ive Discover y Request ) packet s fr om PPPoE
client s. This t ag is defined in RFC 2516 and has t he following for m at for t his feat ur e.
PPPoE IA
PPPoE Server
PPPoE Client
Table 120
PPPoE I nt er m ediat e Agent Vendor - specific Tag For m at
Tag_Ty pe
( 0x 0105)
Tag_Len
Value
i1
i2
