Web Management Guide-R05

Chapter 15 | IP Services
Configuring the PPPoE Intermediate Agent
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◆ PPPoE IA Status – Enables the PPPoE IA on an interface. (Default: Disabled)
Note that PPPoE IA must also be enabled globally on the switch for this
command to take effect.
◆ Trust Status – Sets an interface to trusted mode to indicate that it is connected
to a PPPoE server. (Default: Disabled)
■
Set any interfaces connecting the switch to a PPPoE Server as trusted.
Interfaces that connect the switch to users (PPPoE clients) should be set as
untrusted.
■
At least one trusted interface must be configured on the switch for the
PPPoE IA to function.
◆ 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)
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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.
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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.