User manual

Chapter 30 PPPoE
GS2210 Series User’s Guide
270
Working Text (WT)-101. The default access node identifier is the host name of the PPPoE intermediate
agent and the eth indicates “Ethernet”.
30.1.2.3 Port State
Every port is either a trusted port or an untrusted port for the PPPoE intermediate agent. This setting is
independent of the trusted/untrusted setting for DHCP snooping or ARP inspection. You can also specify
the agent sub-options (circuit ID and remote ID) that the Switch adds to PADI and PADR packets from
PPPoE clients.
Trusted ports are connected to PPPoE servers.
• If a PADO (PPPoE Active Discovery Offer), PADS (PPPoE Active Discovery Session-confirmation), or
PADT (PPPoE Active Discovery Terminate) packet is sent from a PPPoE server and received on a
trusted port, the Switch forwards it to all other ports.
• If a PADI or PADR packet is sent from a PPPoE client but received on a trusted port, the Switch
forwards it to other trusted port(s).
Note: The Switch will drop all PPPoE discovery packets if you enable the PPPoE intermediate
agent and there are no trusted ports.
Untrusted ports are connected to subscribers.
• If a PADI, PADR, or PADT packet is sent from a PPPoE client and received on an untrusted port, the
Switch adds a vendor-specific tag to the packet and then forwards it to the trusted port(s).
• The Switch discards PADO and PADS packets which are sent from a PPPoE server but received on an
untrusted port.
30.2 PPPoE Screen
Use this screen to configure the PPPoE Intermediate Agent on the Switch.
Click Advanced Application > PPPoE in the navigation panel to display the screen as shown. Click Click
Here to go to the Intermediate Agent screen.
Figure 197 Advanced Application > PPPoE Intermediate Agent
Table 125 PPPoE IA Circuit ID Sub-option Format: Defined in WT-101
SubOpt Length Value
0x01
(1 byte)
N
(1 byte)
Access
Node
Identifier
(20 byte)
Space
(1
byte)
eth
(3
byte)
Space
(1
byte)
Slot ID
(1
byte)
/
(1
byte)
Port No
(2 byte)
:
(1
byte)
VLAN ID
(4
bytes)