Cisco Cisco IOS Software Release 12.2(27)SBC

Outgoing PADO and PADS packets will have the DSLAM-inserted Remote-ID and DSL-Sync-Rate tags, 
and the DSLAM must strip these tags from the packets. If the DSLAM cannot strip the tag, the BRAS 
must remove it before sending out the packets. This task is accomplished through configuration of the 
vendor-tag strip command in BBA group configuration mode. Note that the vendor-tag strip command 
also removes the Circuit-ID tag.

configure terminal

bba-group pppoe group-name

Router(config-bba-group)# vendor-tag 

dsl-sync-rate service

Enables the BRAS to process the incoming PADR frames 
and send the DSL-Sync-Rate tags to the RADIUS server as 
VSAs.

Router(config-bba-group)# nas-port-id format c

Specifies a format for broadband subscriber access line 
identification coding.

The designation of format c is specifically designed for a 
particular coding format. A sample of this format is as 
follows:

NAS_PORT_ID=atm 31/31/7:255.65535 
guangzhou001/0/31/63/31/127

This means the subscriber interface type of the BRAS 
equipment is an ATM interface. The BRAS slot number is 
31, and the BRAS subslot number is 31. The BRAS port 
number is 7. The virtual path identifier (VPI) is 255, and the 
virtual circuit identifier (VCI) is 65535. 

The Circuit-ID/Remote-ID tag is 
guangzhou001/0/31/63/31/127.