Networking Software (IOS & NX-OS)

Table Of Contents

Configuring the Physical Subscriber Line for RADIUS Access and Accounting

Finding Feature Information

Contents

Prerequisites for Configuring the Physical Subscriber Line for RADIUS Access and Accounting

Information About Configuring the Physical Subscriber Line for RADIUS Access and Accounting

PPP over ATM and PPPoE over ATM NAS-Port Attribute Field Format

PPPoE over IEEE 802.1Q VLANs Format

How to Configure the Physical Subscriber Line for RADIUS Access and Accounting

Configuring the LAC for RADIUS Port Identification for PPP

Configuring the LNS for RADIUS Port Identification for PPP

Configuration Examples for Identifying the Physical Subscriber Line

RADIUS Port Identification for PPPoE over ATM: Example

RADIUS Port Identification for PPPoE over an 802.1Q VLAN: Example

LNS Configuration for RADIUS Port Identification for PPP: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Identifying the Physical Subscriber Line for RADIUS Access and Accounting

Configuring the Physical Subscriber Line for RADIUS Access and Accounting

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First Published: May 2, 2005

Last Updated: November 20, 2009

Configuring a physical subscriber line for RADIUS Access and Accounting enables an L2TP access concentrator (LAC) and an L2TP network server (LNS) to forward RADIUS NAS-Port and NAS-Port-Type attribute values for PPP over ATM, PPPoE over ATM, and PPPoE over IEEE 802.1Q VLANs.

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 Identifying the Physical Subscriber Line for RADIUS Access and Accounting" 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://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Configuring the Physical Subscriber Line for RADIUS Access and Accounting

•Information About Configuring the Physical Subscriber Line for RADIUS Access and Accounting

•How to Configure the Physical Subscriber Line for RADIUS Access and Accounting

•Configuration Examples for Identifying the Physical Subscriber Line

•Additional References

•Feature Information for Identifying the Physical Subscriber Line for RADIUS Access and Accounting

Prerequisites for Configuring the Physical Subscriber Line for RADIUS Access and Accounting

•RADIUS port identification for PPP requires the PPP extended NAS-Port format.

•You must perform the configuration procedures in the "Configuring RADIUS" chapter in the Cisco IOS Security Configuration Guide.

•You must perform the PPP over ATM configuration procedures in the "Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions" module.

•You must perform the PPPoE configuration procedures in the "Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions" module.

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Note The PPP extended NAS-Port format increases the size of the NAS-Port attribute field to 32 bits and changes the NAS-Port attribute format to provide the RADIUS server with details about the ATM port, the virtual path identifier (VPI), the virtual channel identifier (VCI), and, for IEEE 802.1Q VLANs, the VLAN ID.

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Information About Configuring the Physical Subscriber Line for RADIUS Access and Accounting

To configure the physical subscriber line for communication to the RADIUS server, you should understand the following concepts:

•PPP over ATM and PPPoE over ATM NAS-Port Attribute Field Format

•PPPoE over IEEE 802.1Q VLANs Format

PPP over ATM and PPPoE over ATM NAS-Port Attribute Field Format

For PPP over ATM and PPP over ATM, the PPP extended format enables the NAS-Port attribute field to provide details about the ATM interface, VPI, and VCI. Figure 1 shows the format of the NAS-Port attribute field when the PPP extended NAS-Port format is configured and PPPoA over ATM or PPPoE over ATM is being used.

Figure 1 Format of the NAS-Port Attribute Field for PPP over ATM and PPPoE over ATM

The interfaces, VPI, and VCI correspond to the interface and virtual circuit (VC) on which the ppp session entered the router.

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Note For Cisco 6400 series routers, the interface, VPI, and VCI correspond to the interface and VC on which the session entered the Cisco 6400 node switch processor (NSP).

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Figure 2 shows the format of the 8-bit interface field. For platforms that do not have slots or modules, the slot and module fields is 0.

Figure 2 Format of the Interface Field for PPP over ATM and PPPoE over ATM

The NAS-Port-Type value for PPP over ATM and PPPoE over ATM is 5, which is the value for virtual port types.

PPPoE over IEEE 802.1Q VLANs Format

For PPPoE over 802.1Q VLANs, the PPP extended format provides details about the interface and the VLAN ID. Figure 3 shows the format of the NAS-Port attribute field when the PPP extended NAS-Port format is configured and PPPoE over an IEEE 802.1Q VLAN is being used.

Figure 3 Format of the NAS-Port Attribute Field for PPPoE over 802.1Q VLANs

Figure 4 shows the format of the 8-bit interface field. For platforms that do not have slots or modules, the slot and module fields will be 0.

Figure 4 Format of the Interface Field for PPPoE over 802.1Q VLANs

The NAS-Port-Type value for PPPoE over 802.1Q VLANs is 15.

How to Configure the Physical Subscriber Line for RADIUS Access and Accounting

This section contains the following procedures:

•Configuring the LAC for RADIUS Port Identification for PPP (required)

•Configuring the LNS for RADIUS Port Identification for PPP (required)

Configuring the LAC for RADIUS Port Identification for PPP

Perform this task to configure the LAC for RADIUS port identification for PPP.

SUMMARY STEPS

1. enable

2. configure terminal

3. radius-server attribute nas-port format d

4. end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	radius-server attribute nas-port format d Example: Router(config)# radius-server attribute nas-port format d	Specifies that PPP extended NAS-Port format that is used for RADIUS accounting.
Step 4	end Example: Router(config-bba-group)# end	Ends the configuration session and returns to privileged EXEC mode.

Configuring the LNS for RADIUS Port Identification for PPP

Perform this task to configure the LNS for RADIUS port identification for PPP.

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Note In order for the LNS to forward PPP extended NAS-Port format values to the RADIUS server, both the LAC and the LNS must be Cisco routers running a Cisco IOS image that supports RADIUS port identification for PPP.

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SUMMARY STEPS

1. enable

2. configure terminal

3. radius-server attribute nas-port format d

4. vpdn aaa attribute nas-port vpdn-nas

5. end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	radius-server attribute nas-port format d Example: Router(config)# radius-server attribute nas-port format d	Specifies that PPP extended NAS-Port format that is used for RADIUS accounting.
Step 4	vpdn aaa attribute nas-port vpdn-nas Example: Router(config)# vpdn aaa attribute nas-port vpdn-nas	Enables the LNS to send PPP extended NAS-Port format values to the RADIUS server for accounting.
Step 5	end Example: Router(config-bba-group)# end	Ends the configuration session and returns to privileged EXEC mode.

Configuration Examples for Identifying the Physical Subscriber Line

This section provides the following configuration examples:

•RADIUS Port Identification for PPPoE over ATM: Example

•RADIUS Port Identification for PPPoE over an 802.1Q VLAN: Example

•LNS Configuration for RADIUS Port Identification for PPP: Example

RADIUS Port Identification for PPPoE over ATM: Example

The following example shows the configuration of the PPP extended NAS-Port format on an LAC using PPPoE over ATM:

vpdn enable 

! 

vpdn-group 1 

 request-dialin 

 protocol l2tp 

 domain vpn1

initiate-to ip 10.12.1.64  priority 1 

 local name NAS1-1 

! 

virtual-template 1 pre-clone 20 

virtual-template 2 pre-clone 20 

!

! 

bba-group pppoe vpn1 

 virtual-template 1 

 sessions per-vc limit 2 

 sessions per-mac limit 1 

! 

!

interface ATM4/0.1 multipoint

 pvc 1/33

 encapsulation aal5snap

 protocol pppoe group vpn1

!

!

aaa new-model

aaa authentication ppp default local group radius

aaa authorization network default local group radius

aaa accounting network default start-stop group radius

radius-server host 172.69.69.66 auth-port 1645 acct-port 1646

radius-server retransmit 3

radius-server attribute nas-port format d

radius-server key rad123

!

RADIUS Port Identification for PPPoE over an 802.1Q VLAN: Example

The following example shows the configuration of the PPP extended NAS-Port format on an LAC running PPPoE over an 802.1Q VLAN:

bba-group pppoe global 

 virtual-template 1 

 sessions max limit 8000 

 sessions per-vc limit 8 

sessions per-mac limit 2

! 

bba-group pppoe vpn1 

 virtual-template 1 

 sessions per-vc limit 2 

 sessions per-mac limit 1 

! 

bba-group pppoe vpn2 

 virtual-template 2 

 sessions per-vc limit 2 

 sessions per-mac limit 1 ! 

vc-class atm class-pppoe-global 

 protocol pppoe 

! !

interface FastEthernet2/0.2

 encapsulation dot1Q 2

 pppoe enable group vpn1

!

interface FastEthernet2/0.3

 encapsulation dot1Q 3

 pppoe enable group vpn2

!

aaa new-model

aaa authentication ppp default local group radius

aaa authorization network default local group radius

aaa accounting network default start-stop group radius

radius-server host 172.69.69.66 auth-port 1645 acct-port 1646

radius-server retransmit 3

radius-server attribute nas-port format d

radius-server key rad123

LNS Configuration for RADIUS Port Identification for PPP: Example

In the following example, the LNS is configured to recognize and forward PPP extended NAS-Port format values to the RADIUS server. The PPP extended NAS-Port format must also be configured on the LAC for this configuration to be effective.

vpdn enable

no vpdn logging

!

vpdn-group L2TP-tunnel

 accept-dialin

 protocol l2tp

 virtual-template 1

 terminate-from hostname lac1

 local name lns1

!         

!

aaa new-model

aaa authentication ppp default local group radius

aaa authorization network default local group radius

aaa accounting network default start-stop group radius

radius-server host 172.79.79.76 auth-port 1645 acct-port 1646

radius-server retransmit 3

radius-server attribute nas-port format d

radius-server key lns123

!

vpdn aaa attribute nas-port vpdn-nas

Additional References

The following sections provide references related to the Identifying the Physical Subscriber Line for RADIUS Access and Accounting feature.

Related Documents

Related Topic	Document Title
Configuring PPP over ATM sessions	"Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions" module
Configuring PPPoE sessions	"Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions" module
RADIUS configuration	"Configuring RADIUS" module of the Cisco IOS Security Configuration Guide
RADIUS attributes	"RADIUS Attributes" appendix to the Cisco IOS Security Configuration Guide
Tunneling configuration	"Configuring Virtual Private Networks" module of the Cisco IOS Dial Technologies Configuration Guide

Standards

Standard	Title
No new or modified standards are supported by this feature.	—

MIBs

MIB	MIBs Link
No new or modified MIBs are supported by this feature.	To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs

RFCs

RFC	Title
None	—

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

Feature Information for Identifying the Physical Subscriber Line for RADIUS Access and Accounting

Table 1 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Release 12.2(1) or later releases appear in the table.

Not all commands may be available in your Cisco IOS software release. For details on when support for specific commands was introduced, see the command reference documents.

For information on a feature in this technology that is not documented here, see the "Configuring Broadband Access Aggregation Features Roadmap."

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.

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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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Table 1 Feature Information for Identifying the Physical Subscriber Line for RADIUS Access and Accounting

Feature Name	Releases	Feature Information
RADIUS Port Identification	12.2(1) 12.2(33)SRC	Configuring RADIUS port identification for PPP enables an L2TP access concentrator (LAC) and an L2TP network server (LNS) to identify and forward RADIUS NAS-Port and NAS-Port-type attribute values for PPP over ATM, PPPoE over ATM, and PPPoE over IEEE 802.1Q VLANs. The following sections provide information about this feature: "Information About Configuring the Physical Subscriber Line for RADIUS Access and Accounting" section "How to Configure the Physical Subscriber Line for RADIUS Access and Accounting" section on page 3 In 12.2(1), this feature was introduced. In 12.2(33)SRC, this feature was integrated into the SRC release.

Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)

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

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