Tripp Lite NGI-M08C4-L2, Owner'S Manual

Page: 179 / 313

179
SubOpt Length Value
N
(1 byte)
0x01
(1 byte)
Access node
identifier
Space
(1 byte)
eth
(3 bytes)
Space
(1 byte)
Slot ID
(1 byte)
Port ID
(2 bytes)
:
(1 byte)
CVLAN ID
(4 bytes)
/
(1 byte)
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. Youcan also specify
the agent sub-options (circuit ID and remote ID) that the Switch adds to PADI andPADR 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.

The trusted ports can keep/replace/strip vendor-tag of PADO and PADS packet.

Keep: means that the PPPoE agent will keep original vendor-tag in the PADO/PADS
packet.

Replace: means that the PPPoE agent will replace the vendor-tag in the PADO/PADS
packet with its own vendor-tag.

Strip: means that the PPPoE agent will strip the vendor-tag in the PADO/PADS packet
(Default).
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.
6.12.1 Global Configuration
6.12.1.1 CLI Configuration
Node Command Description
enable show pppoe intermediate-agent
configuration
This command displays the current
configurations for the PPPoE IA.
enable configure terminal This command changes the node to
configure node.
configure pppoe intermediate-agent This command disables / enables the PPPoE