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Working Text (WT)-101. The default access node identifier is the host name of the PPPoE intermediate
agent and the eth indicates "Ethernet".
Table 106 PPPoE IA Circuit ID Sub-option Format: Defined in WT-101
SubOpt
0x01
N
(1 byte)
(1 byte)
28.1.2.3 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.
28.2 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 155 Advanced Application > PPPoE Intermediate Agent
Length
Access
Space
Node
(1
Identifier
byte)
(20 byte)
XS1930 Series User's Guide
Chapter 28 PPPoE
Value
eth
Space
Slot ID
(3
(1
(1
byte)
byte)
byte)
220
/
Port No
:
VLAN ID
(1
(2 byte)
(1
(4
byte)
byte)
bytes)
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