Cisco Cisco IOS Software Release 12.4(15)T

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L2TP Forwarding of PPPoE Tag Information
The L2TP Forwarding of PPPoE Tag Information feature allows you to identify and uniquely map 
subscribers to Point-to-Point Protocol over Ethernet (PPoE) sessions through the subscriber’s remote ID. 
This feature passes subscriber information collected on the Digital Subscriber Line Access Multiplexer 
(DSLAM) through to the Line Network Server (LNS) using a Layer 2 Tunneling protocol (L2TP) 
attribute-value (AV) pair. 
Configuration Information
Configuration information is included in the “Configuring AAA for VPDNs” chapter of the Cisco IOS 
VPDN Configuration Guide,
 Release 12.4T,
 
at the following URL:
Command Reference Information
Command reference information is included in the Cisco IOS VPDN Command Reference, 
Release 12.4T, at the following URL:
New or Modified Commands
The following commands are modified for this feature:
dsl-line-info-forwarding
radius-server attributes 87 circuit-id
List of All Release 12.4T Commands
An alphabetical list of all Cisco IOS Release 12.4T commands is in the Cisco IOS Master Commands 
List
, Release 12.4T, at the following URL:
List of All New, Modified, Removed, and Replaced Release 12.4T Commands
Alphabetized lists of all new, modified, removed, and replaced commands for each Cisco IOS 
Release 12.4T release are in the Cisco IOS New, Modified, Removed, and Replaced Commands
Release 12.4T, document at the following URL: