для Cisco Cisco IOS Software Release 12.2(27)SBC

It is recommended that you be familiar with the following documents before configuring this feature: 

RFC 2516: 

DSL Forum 2004-71

See the 

 for more information.

To configure the PPPoE Agent Remote-ID and DSL Line Characteristics feature, you should understand 
the following concepts:

Broadband DSLAM and Broadband Remote Access Server (BRAS) vendors need to provide 
Ethernet-based networks as an alternative to an ATM access network, with a DSLAM bridging the 
ATM-DSL local loop to the Ethernet-based broadband access network and allowing Ethernet-based 
connectivity to the BRAS. But in an Ethernet broadband access network, there is no unique mapping 
between the subscriber Line-ID tag and the interface, as in an ATM-based broadband network. In an 
ATM-based broadband network, the ATM VC is associated to a subscriber line. During the 
authentication phase that initiates the PPP access and AAA accounting requests, the BRAS includes a 
NAS-Port-ID attribute in RADIUS authentication packets that identifies the DSL line for the subscriber. 

DSL Forum 2004-71 defines a method whereby the DSLAM sends the DSL Remote-ID tag in the PPPoE 
discovery phase to apply the same subscriber mapping capability to Ethernet interfaces that is possible 
on ATM interfaces. This method adds support for the PPPoE server acting as a BRAS to report the 
Remote-ID tag as a new vendor-specific attribute (VSA) (AAA_AT_REMOTE_ID) in AAA