RADIUS Attributes Configuration Guide Cisco IOS Release 15 M and T

Connect-Info RADIUS Attribute 77

The Connect-Info RADIUS Attribute 77 feature enables the Network Access Server (NAS) to report Connect-Info (attribute 77) in RADIUS accounting "start" and "stop" records that are sent to the RADIUS client (dial-in modem). These records allow the transmit and receive connection speeds, modulation, and compression to be compared in order to analyze a user session over a dial-in modem where speeds are often different at the end of the connection (after negotiation).

When the network access server (NAS) sends attribute 77 in accounting "start" and "stop" records, the connect rates can be measured across the platform. The "transmit" speed (the speed at which the NAS modem sends information) and "receive" speed (the speed at which the NAS receives information) can be recorded to determine whether user modem connections renegotiate to lower speeds shortly into a session. If the transmit and receive speeds are different from each other, attribute 77 reports both speeds, which allows the modem connection speeds that each customer gets from their session.

Attribute 77 is also used to send the Class string for broadband connections such as PPPoX, physical connection speeds for dial access, and the VRF string for any sessions on router interfaces defined with ip vrf forwarding command.

Note This feature requires no configuration.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Connect-Info RADIUS Attribute 77" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.

Contents

•Prerequisites for Connect-Info RADIUS Attribute 77

•How to Verify the Connect-Info RADIUS Attribute 77

•Configuration Example for Connect-Info RADIUS Attribute 77

•Additional References

•Feature Information for Connect-Info RADIUS Attribute 77

Prerequisites for Connect-Info RADIUS Attribute 77

Before the NAS can send attribute 77 in accounting "start" and "stop" records, you must perform the following tasks:

•Configure your NAS for authentication, authorization, and accounting (AAA) and to accept incoming modem calls.

•Enable AAA accounting by using the aaa accounting network default start-stop group radius command in global configuration mode.

•Change the modem poll timer by using the modem link-info poll time command in global configuration mode. (Changing the modem poll timer is required on all supported platforms except the Cisco AS5400).

How to Verify the Connect-Info RADIUS Attribute 77

To verify attribute 77 in your accounting "start" and "stop" records, use the debug radius privileged EXEC command. The following example shows that Connect-Info appears in the first and last accounting attributes:

Router# debug radius

RADIUS: code=Acct-Request id=04 len=0134

                authenticator=BE A2 F3 BD EE CE 89 C7 - 48 19 32 F5 79 84 94 D5

                T=Connect-Info[77]                 L=17 V="31200/33600 V34+/LAPM"

                T=Acct-Status-Type[40]             L=06 V=Start                [1]

                ...

RADIUS: code=Acct-Request id=07 len=0226

                authenticator=06 AC 03 10 4A 84 44 A4 - 6F D9 68 AA B3 90 44 CB

                ...

                T=Connect-Info[77]                 L=1F V="33600 V34+/LAPM (31200/336"

                T=Acct-Status-Type[40]             L=06 V=Stop                 [2]

                ...

Note If the modem negotiation speeds are different, the speeds are shown in a bracket format at the end of the call.

Configuration Example for Connect-Info RADIUS Attribute 77

This section provides the following configuration example:

•Configure NAS for AAA and Incoming Modem Calls Example

Configure NAS for AAA and Incoming Modem Calls Example

The following example is a sample NAS configuration for AAA and incoming modem calls:

interface Serial0:15

  no ip address

  isdn switch-type primary-net5

  isdn incoming-voice modem

!

interface Async1

  ip address 10.0.0.10 255.0.0.0

  encapsulation ppp

  async default routing

  async mode interactive

  no peer default ip address

  ppp authentication chap

!

line 1

  modem InOu

  transport preferred none

  transport input all

  autoselect ppp

!

Additional References

The following sections provide references related to the Connect-Info RADIUS Attribute 77 feature.

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Connect-Info RADIUS Attribute 77

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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