This feature would make the pppoe server much more viable as a cisco/junpier/redback replacement with minimal programming effort.
Simply take the vendor specific pppoe tag "circuit id" and pass it through as the radius NAS-Port-ID attribute the in the radius request packet.
Here are docs on how this works on other platforms:
http://www.cisco.com/c/en/us/td/docs/io ... cidtg.html
https://www.juniper.net/techpubs/en_US/ ... 54378.html
People have begged for this feature in the past:
Without this we will be abandoning routeros for pppoe servers in the future as we really need to see the information givin to us by the dslam.