Ethernet Switch CLI Reference Guide
227
CHAPTER 56
PPPoE IA Commands
Use these commands if you want the Switch to add a vendor-specific tag to PADI (PPPoE
Active Discovery Initiation) and PADR (PPPoE Active Discovery Request) packets from
PPPoE clients. This tag gives a PPPoE termination server additional information (such as the
port number, VLAN ID, and MAC address) that the server can use to identify and authenticate
a PPPoE client.
56.1 PPPoE Intermediate Agent Overview
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.
56.1.1 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).
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).
To Next Page
Loading...
Need help?
General
