DHCP services for accounting

[20vek]

Hello,

I wonder if anybody have RADIUS accounting being used for DHCP services.

DHCP server is configured on Cisco switch ( I actually tried two different platforms 3750 and 4500 series running IOS version 15.x)

It seems like none of the DHCP servers are sending RADIUS attribute #31 (calling station id) to the RADIUS server.

It's sending framed ip address but not calling station id ( the mac address of the dhcp client)

Did anybody experienced a similar problem?

[Austin Sabio]

I would suspect that you are hitting this bug CSCtr03624. I hope this helps. 

CSCtr03624

calling-station-id not send in accounting-start for DHCP accounting

Description Symptom:

Incorrect "calling-station-id" seen during DHCP accounting.

Conditions:

The issue is seen when accounting is triggered by DHCP relay, not seen when accounting is triggered using DHCP server.

Workaround:

Use a DHCP server to start accounting.

Known Affected Releases: (2)
15.1(1)T1
15.1(3)T

Please rate/mark answer as correct if it is helpful to benefit others. Thank you.

[20vek]

Thank you, engineer_aus.

It doesn't look like though...

I was getting the same result for both dhcp server and dhcp relay.

the attribute is completely missing in radius accounting message. 

One switch is running 15.0 and another 15.2 version.

[Austin Sabio]

FYI, sometimes cisco bug' documentation doesn't reflect all affected releases. 

I suggest to validate your config is good and verify dhcp accounting with 'debug radius accounting' and 'debug ip dhcp server events'

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4t/dhcp-12-4t-book/config-dhcp-accounting-security.html#GUID-CCE254B6-08CE-4CFF-A15C-E1867ED7E7C2

[20vek]

Oh. Well... it's a true statement but... it's not the case...

after pocking around and a glass of scotch the solution materialized in one simple command:

radius-server attributes 31 send nas-port-detail mac-only

[Austin Sabio]

Thanks for sharing your solution. I am glad you got it working.