Web Management Guide-R04

Table Of Contents
Chapter 18
| IP Services
Configuring the PPPoE Intermediate Agent
– 718 –
Vendor Tag Strip – Enables the stripping of vendor tags from PPPoE Discovery
packets sent from a PPPoE server. (Default: Disabled)
This parameter only applies to trusted interfaces. It is used to strip off vendor-
specific tags (which carry subscriber and line identification information) in
PPPoE Discovery packets received from an upstream PPPoE server before
forwarding them to a user.
Circuit ID – String identifying the circuit identifier (or interface) on this switch
to which the user is connected. (Range: 1-10 ASCII characters; Default: Unit/
Port:VLAN-ID, or 0/Trunk-ID:VLAN-ID)
The PPPoE server extracts the Line-ID tag from PPPoE discovery stage
messages, and uses the Circuit-ID field of that tag as a NAS-Port-ID attribute
in AAA access and accounting requests.
The switch intercepts PPPoE discovery frames from the client and inserts a
unique line identifier using the PPPoE Vendor-Specific tag (0x0105) to
PPPoE Active Discovery Initiation (PADI) and Request (PADR) packets. The
switch then forwards these packets to the PPPoE server. The tag contains
the Line-ID of the customer line over which the discovery packet was
received, entering the switch (or access node) where the intermediate
agent resides.
Outgoing PAD Offer (PADO) and Session-confirmation (PADS) packets sent
from the PPPoE Server include the Circuit-ID tag inserted by the switch, and
should be stripped out of PADO and PADS packets which are to be passed
directly to end-node clients.
Operational Circuit ID – The configured circuit identifier.
Remote ID – String identifying the remote identifier (or interface) on this
switch to which the user is connected. (Range: 1-63 ASCII characters; Default:
Port MAC address)
Operational Remote ID – The configured circuit identifier.
Web Interface
To configure interface settings for PPPoE IA:
1. Click IP Service, PPPoE Intermediate Agent.
2. Select Configure Interface from the Step list.
3. Select Port or Trunk interface type.
4. Enable PPPoE IA on an interface, set trust status, enable vendor tag stripping if
required, and set the circuit ID and remote ID.
5. Click Apply.