ELTEX LTP-4X, Operation Manual

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Chapter 23.
PPPoE Intermediate Agent Configuration
Introduction
This chapter describes configuration of PPPoE Intermediate Agent of the terminal.
PPPoE Intermediate Agent is used to provide BRAS with additional information about a
received PADI request. This may include information about the terminal running PPPoE
Intermediate Agent as well as information about the ONT, which sent the PADI request. PADI
packets are modified by interception and further processing in the terminal CPU.
BRAS analyses the vendor specific tag and identifies the ONT. PPPoE Intermediate Agent
forms or rewrites the vendor specific tag using a specified format. Vendor specific tags are
especially useful for networks, which have no private VLANs dedicated for each user.
PPPoE Intermediate Agent supports configurable formats for Circuit ID and Remote ID. The
format of the suboptions is configured with the help of the tokens listed in Table 19.1. The
placeholders will be replaced with corresponding values, while the rest of the words will be
passed as is.
Table 19.1. Vendor Specific Tag Tokens
Token
Description
%HOSTNAME% Terminal network name
%MNGIP% Terminal IP address
%GPON-PORT% Number of the OLT channel the PADI request arrived
from
%ONTID% ID of the ONT, which sent the PADI request
%PONSERIAL% Serial number of the ONT, which sent the PADI
request
%GEMID% ID of the GEM port the PADI request arrived to
%VLAN0% External VID
%VLAN1% Internal VID
%MAC% MAC address of the ONT, which sent the request
%OLTMAC% MAC address of OLT
%DESCR% First 20 symbols of ONT description
In addition to vendor specific tag support, PPPoE Intermediate Agent has some more
functions related to network security. It provides protection from DoS attacks by setting a
threshold for intensity of PADI messages, which are received from ONT. Exceeding the
threshold blocks PADI requests. The blocking time can be configured.