[c-nsp] Cisco router DHCP accounting / option82

[Victor Lyapunov]

Hello all

I am experimenting with a 7200 router playing the role of DHCP server
for xDSL subscribers.
In this simple setup the 7200 is the first L3 node for the xDSL
subscribers. Apart from playing
the role of the default gateway, the 7200 using its local DHCP server
also handles the address
allocation  for the users.
One requirement is for the  DHCP server be able to store accounting
data about the bindings,
especially the option82 information inserted by the DSLAM in  the DHCP
requiests.

The DHCP accounting works (the router is able to inform a radius
server when it has performed
an IP allocation or release) but I have not been able to make the 7200
to also send the option82
information to the radius.
(I have verified that the option82 information indeed reaches the 7200).

I have experimented with various radius options (overiding nas-port-id
attribute with circuit-id)
but with no luck so far.

Has anyone succeded in making the DHCP server of a cisco router to
include the Option82
information in the accouting records it sends to a radius?