Configuring the Managed IPv6 Layer 2 Tunnel Protocol Network Server

This document describes how to enable the Managed IPv6 Layer 2 Tunnel Protocol Network Server feature.

Prerequisites for Configuring the Managed IPv6 LNS

For the router to function as an LNS, you must enable Authentication, Authorization, and Accounting (AAA) on the Layer 2 Tunnel Protocol Network Server (LNS) and the Layer 2 Access Concentrator (LAC), by entering the aaa new-model global configuration command. For more information, see the “ Authentication, Authorization, and Accounting ” chapter in the Cisco IOS XE Security: Securing User Services Configuration Guide .

Information About Configuring the Managed IPv6 LNS

L2TP Network Server

The router can function as an LNS. The LNS is a peer to the LAC and sits on one side of an L2TP tunnel. The LNS routes packets to and from the LAC and a destination network. When the router functions as an LNS, you can configure the router to terminate the PPP sessions and route the client IP packets onto the ISP or corporate network toward their final destination (see the figure below). The router can use the Managed IPv6 LNS feature to terminate L2TP sessions from the LAC and place each session into the appropriate IPv6 VRF instance based on the VRF applied to the virtual template interface or alternatively, based on the VRF received for the user through AAA. The router then routes each session within the VRF to the destination network.

Figure 1. Terminating and Forwarding Sessions from the LAC

Tunnel Accounting

The tunnel accounting feature enhances AAA accounting by adding the ability to include tunnel-related statistics in the RADIUS information. Before you can collect tunnel usage information, you must configure the following attributes on the RADIUS server:

  • Acct-Tunnel-Connection—Specifies the identifier assigned to the tunnel session. This attribute and the Tunnel-Client-Endpoint and Tunnel-Server-Endpoint attributes provide a way to uniquely identify a tunnel session for auditing purposes.

  • Acct-Tunnel-Packets-Lost—Specifies the number of packets lost on a given link.

The table below describes the values for the Acct-Status-Type attribute that support tunnel accounting on the RADIUS server.

Table 1. Acct-Status-Type Values for RADIUS Tunnel Accounting

Acct-Status-Type Values

Value

Description

Tunnel-Link-Reject

14

Marks the rejection of the establishment of a new link in an existing tunnel.

Tunnel-Link-Start

12

Marks the creation of a tunnel link within an L2TP tunnel that carries multiple links.

Tunnel-Link-Stop

13

Marks the destruction of a tunnel link within an L2TP tunnel that carries multiple links.

Tunnel-Reject

11

Marks the rejection of the establishment of a tunnel with another device.

Tunnel-Start

9

Marks the establishment of a tunnel with another device.

Tunnel-Stop

10

Marks the destruction of a tunnel to or from another device.

For more information about the RADIUS tunnel accounting attributes or the Acct-Status-Type values that support RADIUS tunnel accounting, see RFC 2867, RADIUS Accounting Modifications for Tunnel Protocol Support.

For information about RADIUS accounting attributes supported on the Cisco ASR 1000 Series Aggregation Services Routers, see the “RADIUS Attributes” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services.

For more information on configuring RADIUS, see your RADIUS user documentation.

How to Configure the Managed LNS

Configuring a VRF on the LNS

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. vrf definition vrf-name
  4. rd route-distinguisher
  5. address-family {ipv4 | ipv6 }
  6. route-target {import | export | both } route-target-ext-community
  7. exit-address-family
  8. address-family {ipv4 | ipv6 }
  9. route-target {import | export | both } route-target-ext-community
  10. end
  11. show ipv6 route vrf vrf-name

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

vrf definition vrf-name

Example:


Router(config)# vrf definition vrf1

Configures a VRF routing table and enters VRF configuration mode.

  • The vrf-name argument is the name of the VRF.

Step 4

rd route-distinguisher

Example:


Router(config-vrf)# rd 100:1

Creates routing and forwarding tables for a VRF.

  • The route-distinguisher argument adds an 8-byte value to an IPv4 prefix to create a VPN IPv4 prefix. You can enter a route distinguisher in either of these formats:
    • 16-bit autonomous system number (ASN): your 32-bit number For example, 101:3.
    • 32-bit IP address: your 16-bit number For example, 192.168.122.15:1.

Step 5

address-family {ipv4 | ipv6 }

Example:


Router(config-vrf) address-family ipv6

Enters VRF address family configuration mode to specify an address family for a VRF.

  • The ipv4 keyword specifies an IPv4 address family for a VRF.

  • The ipv6 keyword specifies an IPv6 address family for a VRF.

Step 6

route-target {import | export | both } route-target-ext-community

Example:


Router(config-vrf-af) route-target both 100:2

Creates a route-target extended community for a VRF.

  • The import keyword imports routing information from the target VPN extended community.

  • The export keyword exports routing information to the target VPN extended community.

  • The both keyword imports both import and export routing information to the target VPN extended community.

  • The route-target-ext-community argument adds the route-target extended community attributes to the VRF list of import, export, or both (import and export) route-target extended communities.

Step 7

exit-address-family

Example:


Router(config-vrf-af)# exit-address-family

Exits VRF address family configuration mode and enters VRF configuration mode.

Step 8

address-family {ipv4 | ipv6 }

Example:


Router(config-vrf) address-family ipv6

Enters VRF address family configuration mode to specify an address family for a VRF.

  • The ipv4 keyword specifies an IPv4 address family for a VRF.

  • The ipv6 keyword specifies an IPv6 address family for a VRF.

Step 9

route-target {import | export | both } route-target-ext-community

Example:


Router(config-vrf-af)# route-target both 100:3

Creates a route-target extended community for a VRF.

  • The import keyword specifies to import routing information from the target VPN extended community.

  • The export keyword specifies to export routing information to the target VPN extended community.

  • The both keyword specifies to import both import and export routing information to the target VPN extended community.

  • The route-target-ext-community argument adds the route-target extended community attributes to the VRF list of import, export, or both (import and export) route-target extended communities.

  • Enter the route-target command one time for each target community.

Step 10

end

Example:


Router(config-vrf-af)# end

Exits VRF address family configuration mode and returns to privileged EXEC mode.

Step 11

show ipv6 route vrf vrf-name

Example:


Router# show ipv6 route vrf vrf1

Displays the IPv6 routing table associated with a VRF.

Configuring a Virtual Template Interface

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface virtual-template number
  4. vrf forwarding name
  5. ppp authentication chap
  6. end
  7. show interfaces virtual-access number [configuration]
  8. debug ppp chap
  9. debug ppp negotiation
  10. debug ppp negotiation chap

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

interface virtual-template number

Example:


Router(config)# interface virtual-template 1

Creates a virtual template interface and enters interface configuration mode.

Step 4

vrf forwarding name

Example:


Router(config-if)# vrf forwarding vpn-1

(Optional) Maps the virtual template interface to a VRF routing table.

Note

 

If the VRF assignment is received via the RADIUS server, then this step is not required.

Step 5

ppp authentication chap

Example:


Router(config-if)# ppp authentication chap

Enables CHAP authentication on the virtual template interface, which is applied to virtual access interfaces (VAI).

Step 6

end

Example:


Router(config-if)# end

Exits interface configuration mode and returns to privileged EXEC mode.

Step 7

show interfaces virtual-access number [configuration]

Example:


Router# show interfaces virtual-access number [configuration]

Displays status, traffic data, and configuration information about the VAI you specify.

Step 8

debug ppp chap

Example:


Router# debug ppp chap

Displays authentication protocol messages for Challenge Authentication Protocol (CHAP) packet exchanges.

  • This command is useful when a CHAP authentication failure occurs due to a configuration mismatch between devices. Verifying and correcting any username and password mismatch resolves the problem.

Step 9

debug ppp negotiation

Example:


Router# debug ppp negotiation

Displays information on traffic and exchanges in an internetwork implementing PPP.

Step 10

debug ppp negotiation chap

Example:


Router# debug ppp negotiation chap

Deciphers a CHAP negotiation problem due to a connectivity problem between a Cisco and non-Cisco device.

Assigning a VRF via the RADIUS Server

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa authorization configuration method-name group group-name
  4. ipv6 dhcp pool pool-name
  5. prefix-delegation aaa [method-list method-list ]
  6. dns-server ipv6-address
  7. exit
  8. interface virtual-template number
  9. ipv6 nd prefix framed-ipv6-prefix
  10. ipv6 dhcp server pool-name rapid-commit
  11. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

aaa authorization configuration method-name group group-name

Example:


Router(config)# aaa authorization configuration DHCPv6-PD group DHCPv6-PD-RADIUS

Downloads configuration information from the AAA server using RADIUS.

Step 4

ipv6 dhcp pool pool-name

Example:


Router(config)# ipv6 dhcp pool DHCPv6-PD

Configures a DHCP for IPv6 configuration information pool and enters DHCP for IPv6 pool configuration mode.

Step 5

prefix-delegation aaa [method-list method-list ]

Example:


Router(config-dhcpv6)# prefix-delegation aaa method-list DHCPv6-PD

Specifies that prefixes are to be acquired from AAA servers.

Step 6

dns-server ipv6-address

Example:


Router(config-dhcpv6)# dns-server 2001:0DB8:3000:3000::42

Specifies the Domain Name System (DNS) IPv6 servers available to a DHCP for IPv6 client.

Step 7

exit

Example:


Router(config-dhcpv6)# exit

Exits DHCP for IPv6 pool configuration mode and enters global configuration mode.

Step 8

interface virtual-template number

Example:


Router(config)# interface virtual-template 1

Creates a virtual template interface that can be configured and applied dynamically in creating VAIs, and enters interface configuration mode.

Step 9

ipv6 nd prefix framed-ipv6-prefix

Example:


Router(config-if)# ipv6 nd prefix framed-ipv6-prefix

Adds the prefix in a received RADIUS framed IPv6 prefix attribute to the interface's neighbor discovery prefix queue.

Step 10

ipv6 dhcp server pool-name rapid-commit

Example:


Router(config-if)# ipv6 dhcp server DHCPv6-PD rapid-commit

Enables DHCPv6 on an interface.

Step 11

end

Example:


Router(config-if)# end

Exits interface configuration mode and returns to privileged EXEC mode.

Configuring the LNS to Initiate and Receive L2TP Traffic

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. vpdn enable
  4. vpdn-group group-name
  5. accept-dialin
  6. protocol 12tp
  7. virtual-template template-number
  8. exit
  9. terminate-from hostname hostname
  10. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

vpdn enable

Example:


Router(config)# vpdn enable

Enables VPDN networking on the router and informs the router to look for tunnel definitions in a local database and on a remote authorization server (home gateway) if one is present.

Step 4

vpdn-group group-name

Example:


Router(config)# vpdn-group group1

Defines a local group name for which you can assign other VPDN variables.

  • Enters VPDN group configuration mode.

Step 5

accept-dialin

Example:


Router(config-vpdn)# accept-dialin

Configures the LNS to accept tunneled PPP connections from the LAC and creates an accept-dialin VPDN subgroup.

  • Enters accept dial-in VPDN subgroup configuration mode.

Step 6

protocol 12tp

Example:


Router(config-vpdn-acc-in)# protocol 12tp

Specifies the Layer 2 Tunnel Protocol.

Step 7

virtual-template template-number

Example:


Router(config-vpdn-acc-in)# virtual-template 1

Specifies the virtual template to be used to clone VAIs.

Step 8

exit

Example:


Router(config-vpdn-acc-in)# exit

Returns to VPDN group configuration mode.

Step 9

terminate-from hostname hostname

Example:


Router(config-vpdn)# terminate-from hostname lac1-vpn1

Specifies the hostname of the remote LAC that is required when accepting a VPDN tunnel.

Step 10

end

Example:


Router(config-vpdn)# end

Exits VPDN configuration mode and returns to privileged EXEC mode.

Limiting the Number of Sessions per Tunnel

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. vpdn-group group-name
  4. accept-dialin
  5. protocol 12tp
  6. virtual-template template-number
  7. exit
  8. terminate-from hostname host-name
  9. session-limit limit-number
  10. exit

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

vpdn-group group-name

Example:


Router(config)# vpdn-group group1

Defines a local group name for which you can assign other VPDN variables.

  • Enters VPDN group configuration mode.

Step 4

accept-dialin

Example:


Router(config-vpdn)# accept-dialin

Configures the LNS to accept tunneled PPP connections from the LAC and creates an accept-dialin VPDN subgroup.

  • Enters accept dial-in VPDN subgroup configuration mode.

Step 5

protocol 12tp

Example:


Router(config-vpdn-acc-in)# protocol 12tp

Specifies the Layer 2 Tunnel Protocol.

Step 6

virtual-template template-number

Example:


Router(config-vpdn-acc-in)# virtual-template 1

Specifies the virtual template to be used to clone VAIs.

Step 7

exit

Example:


Router(config-vpdn-acc-in)# exit

Returns to VPDN group configuration mode.

Step 8

terminate-from hostname host-name

Example:


Router(config-vpdn)# terminate-from hostname test_LAC

Specifies the hostname of the remote LAC that is required when accepting a VPDN tunnel.

Step 9

session-limit limit-number

Example:


Router(config-vpdn)# session-limit 100

Specifies the maximum number of sessions per tunnel.

Step 10

exit

Example:


Router(config-vpdn)# exit

Exits VPDN configuration mode and returns to privileged EXEC mode.

Configuring RADIUS Attribute Accept or Reject Lists

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa authentication ppp default group group-name
  4. aaa authorization network group group group-name
  5. aaa group server radius group-name
  6. server-private ip-address [acct-port port-number ] [timeout seconds ] [retransmit retries ] [key string ]
  7. authorization [accept | reject ] list-name
  8. exit
  9. radius-server attribute list listname
  10. attribute value1 [value2 [value3... ]]
  11. end
  12. show accounting

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

aaa authentication ppp default group group-name

Example:


Router(config)# aaa authentication ppp default group radius_authen1

Specifies one or more AAA authentication methods for use on serial interfaces running PPP.

Step 4

aaa authorization network group group group-name

Example:


Router(config)# aaa authorization network group group radius_authen1

Sets the parameters that restrict network access to the user.

Step 5

aaa group server radius group-name

Example:


Router(config)# aaa group server radius VPDN-Group

Groups different RADIUS server hosts into distinct lists and distinct methods and enters server group RADIUS configuration mode.

Step 6

server-private ip-address [acct-port port-number ] [timeout seconds ] [retransmit retries ] [key string ]

Example:


Router(config-sg-radius)# server-private 10.1.1.2 acct-port 0 timeout 7 retransmit 3 key cisco1

Configures the IP address of the private RADIUS server for the group server.

  • The ip-address argument specifies the IP address of the private RADIUS server host.

  • (Optional) The port-number argument specifies the UDP destination port for accounting requests.

  • (Optional) The seconds argument specifies the timeout value (1 to 1000).

  • (Optional) The retries argument specifies the number of times a RADIUS request is re-sent to a server, if that server is not responding or responding slowly.

  • The string argument specifies the authentication and encryption key for all RADIUS communications between the router and the RADIUS server.

Step 7

authorization [accept | reject ] list-name

Example:


Router(config-sg-radius)# authorization accept vpn1-autho-list

Specifies a filter for the attributes that are returned in an Access-Accept packet from the RADIUS server.

  • The accept keyword indicates that all attributes will be rejected except the attributes specified in the listname argument.

  • The reject keyword indicates that all attributes will be accepted except for the attributes specified in the listname argument and all standard attributes.

Step 8

exit

Example:


Router(config-sg-radius)# exit

Exits server group RADIUS configuration mode and enters global configuration mode.

Step 9

radius-server attribute list listname

Example:


Router(config)# radius-server attribute list vpn1-autho-list

Defines the list name given to the set of attributes defined using the attribute command and enters RADIUS attribute list configuration mode.

  • Define the listname argument to be the same as you defined it in step 7.

Step 10

attribute value1 [value2 [value3... ]]

Example:


Router(config-radius-attrl)# attribute 26,200

Adds attributes to the configured accept or reject list.

  • You can use this command multiple times to add attributes to an accept or reject list.

Step 11

end

Example:


Router(config-radius-attrl)# end

Exits RADIUS attribute list configuration mode and returns to privileged EXEC mode.

Step 12

show accounting

Example:


Router# show accounting

Displays accounting records for users currently logged in.

  • Displays active accountable events on the network and helps collect information in the event of a data loss on the accounting server.

Configuring AAA Accounting Using Named Method Lists


Note

System accounting does not use named method lists. For system accounting you can define only the default method list. For more information, see the “Configuring Accounting ” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa accounting network list-name start-stop group radius
  4. line [aux | console | vty ] [line-number ]
  5. accounting {arap | commands level | connection| exec | resource } [default | list-name ]
  6. end
  7. debug aaa accounting

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

aaa accounting network list-name start-stop group radius

Example:


Router(config)#  aaa accounting network methodlist start-stop group radius

Creates an accounting method list and enables accounting.

Step 4

line [aux | console | vty ] [line-number ]

Example:


Router(config)# line console 0

Enters line configuration mode for the line to which you want to apply the accounting method list.

Step 5

accounting {arap | commands level | connection| exec | resource } [default | list-name ]

Example:


Router(config-line)# accounting commands 15 list1

Applies the accounting method list to a line or a set of lines.

Step 6

end

Example:


Router(config-line)# end

Exits line configuration mode and returns to privileged EXEC mode.

Step 7

debug aaa accounting

Example:


Router# debug aaa accounting

Displays information on accountable events as they occur.

Configuring RADIUS Tunnel Authentication Method Lists on the LNS

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa authorization network list-name method1 [method2...]
  4. vpdn tunnel authorization network lmethod-ist-name method1 [method2...]
  5. vpdn tunnel authorization virtual-template vtemplate-number
  6. vpdn tunnel authorization password dummy-password
  7. debug aaa authorization

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

aaa authorization network list-name method1 [method2...]

Example:


Router(config)# aaa authorization network mymethodlist group VPDN-Group

Sets parameters that restrict user access to a network.

  • The list-name argument is a character string used to name the list of authentication methods tried when a user logs in.

  • group radius: Uses the list of all RADIUS servers for authentication.

  • group group-name: Uses a subset of RADIUS servers for authentication as defined by the aaa group server radius command.

  • if-authenticated: Succeeds if user has been successfully authenticated.

  • local: Uses the local username database for authentication.

  • none: Uses no authentication.

Note

 

The method list is only for VPDN tunnel authorization and termination, not for domain and Digital Number Identification Service (DNIS) authorization. Therefore, the method list applies only on the tunnel terminator device - the LAC for dialout sessions and the LNS for dialin sessions.

Step 4

vpdn tunnel authorization network lmethod-ist-name method1 [method2...]

Example:


Router(config)# vpdn tunnel authorization network mymethodlist

Specifies the AAA method list to use for VPDN remote tunnel hostname-based authorization.

  • If you do not specify a method list (including a default method list) by using the vpdn tunnel authorization network command, local authorization occurs by using the local VPDN group configuration.

Step 5

vpdn tunnel authorization virtual-template vtemplate-number

Example:


Router(config)# vpdn tunnel authorization virtual-template 10

Specifies the default virtual template interface used to clone a VAI.

  • If you do not specify a virtual template interface in the local VPDN group configuration or in a remote RADIUS configuration, then the default virtual template interface is used.

Step 6

vpdn tunnel authorization password dummy-password

Example:


Router(config)# vpdn tunnel authorization password mypassword

Specifies the password to use for the RADIUS authorization request to retrieve the tunnel configuration based on the remote tunnel hostname.

Step 7

debug aaa authorization

Example:


Router# debug aaa authorization

Displays information on AAA authorization.

Configuring the LNS for RADIUS Tunnel Authentication

Perform the following tasks to configure LNS for RADIUS Tunnel Authentication:


Note

Cisco ASR 1000 Series Aggregation Services Routers supports L2TP tunnel authorization. However, RADIUS does not provide attributes for such parameter values as L2TP tunnel timeouts, L2TP tunnel hello intervals, and L2TP tunnel receive window size. When the Cisco ASR 1000 Series Aggregation Services Router does not receive a RADIUS attribute for a parameter, the router uses the default value.

Configuring RADIUS Tunnel Authentication Method Lists on the LNS

To configure method lists on the LNS for RADIUS tunnel authentication, perform the following task.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa authorization network list-name method1 [method2... ]
  4. vpdn tunnel authorization network method- list-name
  5. vpdn tunnel authorization virtual-template vtemplate-number
  6. vpdn tunnel authorization password dummy-password
  7. end
  8. debug aaa authorization

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enters privileged EXEC mode.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

aaa authorization network list-name method1 [method2... ]

Example:


Router(config)# aaa authorization network mymethodlist group VPDN-Group

Sets parameters that restrict user access to a network

  • Thelist-name argument is a character string used to name the list of authentication methods tried when a user logs in.
    • groupradius —Uses the list of all RADIUS servers for authentication.
    • group group-name —Uses a subset of RADIUS servers for authentication as defined by the aaa group server radius command.
    • if-authenticated —Succeeds if user has been successfully authenticated.
    • local —Uses the local username database for authentication.
    • none —Uses no authentication.

Note

 

The method list is only for VPDN tunnel authorization and termination, not for domain and Digital Number Identification Service (DNIS) authorization. Therefore, the method list applies only on the tunnel terminator device—the LAC for dialout sessions and the LNS for dialin sessions.

Step 4

vpdn tunnel authorization network method- list-name

Example:


Router(config)# vpdn tunnel authorization network mymethodlist

Specifies the AAA method list to use for VPDN remote tunnel hostname-based authorization.

  • If you do not specify a method list (including a default method list) by using the vpdntunnelauthorizationnetwork command, local authorization occurs by using the local VPDN group configuration.

Step 5

vpdn tunnel authorization virtual-template vtemplate-number

Example:


Router(config)# vpdn tunnel authorization virtual-template 10

Specifies the default virtual template interface used to clone a VAI.

  • If you do not specify a virtual template interface in the local VPDN group configuration or in a remote RADIUS configuration, then the default virtual template interface is used.

Note

 

The vpdntunnelauthorizationvirtual-template command is applicable only on the LNS.

Step 6

vpdn tunnel authorization password dummy-password

Example:


Router(config)# vpdn tunnel authorization password mypassword

Specifies the password to use for the RADIUS authorization request to retrieve the tunnel configuration based on the remote tunnel hostname.

  • By default, the password is cisco, but you can configure a different password.

Note

 

The vpdntunnelauthorizationpassword command is applicable on both the LAC and LNS.

Step 7

end

Example:


Router(config)# end

Exits global configuration mode and returns to privileged EXEC mode.

Step 8

debug aaa authorization

Example:


Router# debug aaa authorization

Displays information on AAA authorization.

Configuring AAA Authentication Methods

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. aaa new-model
  4. Configure RADIUS security protocol parameters. For more information about RADIUS, see the “Configuring RADIUS” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services .
  5. aaa authentication
  6. Apply the authentication method lists to an interface, a line, or a set of lines as required. For more information about authentication method lists, see the “Configuring Authentication” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services .
  7. end

DETAILED STEPS

Step 1

enable

Step 2

configure terminal

Step 3

aaa new-model

Enter this command in global configuration mode to enable AAA.

Step 4

Configure RADIUS security protocol parameters. For more information about RADIUS, see the “Configuring RADIUS” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services .

Step 5

aaa authentication

Enter this command to define the authentication method lists.

Step 6

Apply the authentication method lists to an interface, a line, or a set of lines as required. For more information about authentication method lists, see the “Configuring Authentication” chapter in the Cisco IOS XE Security Configuration Guide: Securing User Services .

Step 7

end

Configuration Examples for the Managed IPv6 Layer 2 Tunnel Protocol Network Server

Example Managed IPv6 LNS Configuration

The following example shows how to configure Managed IPv6 LNS features on the router. In this example, the router terminates the tunnel from the LAC and associates the VRFs with the interfaces and the virtual template interfaces. This configuration also shows how to configure RADIUS attribute screening and AAA accounting for the VRFs. 


!
!
vrf definition Mgmt-intf
 !
 address-family ipv4
 exit-address-family
 !
 address-family ipv6
 exit-address-family
!
vrf definition user_vrf1
 rd 1:1
 route-target export 1:1
 route-target import 1:1
 !
 address-family ipv6
 exit-address-family
!
logging buffered 10000000
enable password lab
!
aaa new-model
!
!
aaa group server radius radius_authen1
 server-private 10.1.1.2 acct-port 0 timeout 7 retransmit 3 key cisco1 
 ip radius source-interface Loopback20000
!
aaa authentication login default none
aaa authentication ppp default group radius_authen1
aaa authorization network default group radius_authen1 
aaa authorization configuration DHCPv6-PD group radius_authen1 
!
!
!
!
!
aaa session-id common
aaa policy interface-config allow-subinterface
ppp hold-queue 80000
clock timezone EST -5 0
ip source-route
no ip gratuitous-arps
!
!
!
!
!
!
!
no ip domain lookup
ip host mcp-matrix 10.0.0.2 
ip host mcp-sun-2 10.0.0.2 
!
!
ipv6 unicast-routing
ipv6 dhcp binding track ppp
ipv6 dhcp pool ipv6_dhcp_pool1
 prefix-delegation aaa method-list DHCPv6-PD
!
!
!
!
multilink bundle-name authenticated
vpdn enable
!
vpdn-group VPDN_LNS1
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname test_LAC1
 source-ip 10.0.0.2 
 local name test_LNS1
 l2tp tunnel password 0 tunnel1
 l2tp tunnel receive-window 100
 l2tp tunnel timeout no-session 30
 l2tp tunnel retransmit retries 7
 l2tp tunnel retransmit timeout min 2
!
!         
no virtual-template snmp
!
!
!
!
!
!
!
!
!
username asifp1@test1 password 0 hello1
!
redundancy
 notification-timer 30000
 mode none
!
!
!
!
!
ip tftp source-interface GigabitEthernet 0
!
! 
! 
!
!
!
!
!
interface Loopback1
 no ip address
!
interface Loopback20000
 ip address 209.165.202.131 255.255.255.224 
!
interface GigabitEthernet1/1/0
 mac-address 8888.8888.8888
 no ip address
 load-interval 30
 negotiation auto
 hold-queue 4096 in
 hold-queue 4096 out
!
interface GigabitEthernet1/1/0.1
 encapsulation dot1Q 3
 ip address 209.165.202.132 255.255.255.224 
!
interface GigabitEthernet1/1/1
 mac-address 4444.4444.4444
 no ip address
 load-interval 30
 no negotiation auto
 hold-queue 4096 in
 hold-queue 4096 out
!
interface GigabitEthernet1/1/1.1
 vrf forwarding user_vrf1
 encapsulation dot1Q 2
 ipv6 address 12::1/72
!
interface GigabitEthernet1/1/2
 no ip address
 negotiation auto
!
interface GigabitEthernet1/1/3
 no ip address
 negotiation auto
!
interface GigabitEthernet1/1/4
 no ip address
 negotiation auto
!         
interface GigabitEthernet1/1/5
 no ip address
 negotiation auto
!
interface GigabitEthernet1/1/6
 no ip address
 negotiation auto
!
interface GigabitEthernet1/1/7
 description Connected to RADIUS
 ip address 209.165.201.1 255.255.255.224
 negotiation auto
!
interface GigabitEthernet1/3/0
 no ip address
 media-type sfp
 negotiation auto
!
interface GigabitEthernet1/3/1
 no ip address
 media-type sfp
 negotiation auto
!
interface GigabitEthernet 0
 vrf forwarding Mgmt-intf
 ip address 209.165.201.1 255.255.255.224
 negotiation auto
!
interface Virtual-Template 1
 no ip address
 no logging event link-status
 ipv6 dhcp server ipv6_dhcp_pool1 rapid-commit
 keepalive 30
 ppp mtu adaptive
 ppp authentication pap
!
ip default-gateway 10.1.0.5 
ip forward-protocol nd
!
no ip http server
no ip http secure-server
ip route vrf Mgmt-intf 209.165.201.1 255.255.255.254 172.16.1.1
ip route vrf Mgmt-intf 209.165.201.29 255.255.255.224 172.16.0.1 
!
ip radius source-interface GigabitEthernet1/1/7 
logging esm config
cdp run
ipv6 route vrf user_vrf1 ::/0 12::2
!
ipv6 neighbor 12::2 GigabitEthernet1/1/1.1 2222.2222.2222
!
!
!
control-plane
!
call admission limit 90
!
!
!
alias exec call show caller summ
alias exec caller show caller summ
alias exec palt show plat
alias exec plat show platform
alias exec evsi sho plat hard cpp act feat ess stat
!
line con 0
 exec-timeout 0 0
 stopbits 1
line vty 0 4
 exec-timeout 0 0
 password password1 
!         
exception data-corruption buffer truncate
end

Example LNS Tunnel Accounting Configuration

The following example shows how to configure the LNS to send tunnel accounting records to the RADIUS server: 


aaa new-model 
! 
! 
aaa accounting network m1 start-stop group radius 
aaa accounting network m2 stop-only group radius 
aaa session-id common 
enable secret 5 $1$ftf.$wE6Q5Yv6hmQiwL9pizPCg1 
! 
username ENT_LNS password 0 tunnelpass 
username user1@example.com password 0 lab 
username user2@example.com password 0 lab 
spe 1/0 1/7 
firmware location system:/ucode/mica_port_firmware 
spe 2/0 2/9 
firmware location system:/ucode/mica_port_firmware 
! 
! 
resource-pool disable 
clock timezone est 2 
! 
ip subnet-zero 
no ip domain-lookup 
ip host CALLGEN-SECURITY-V2 10.24.80.28 10.47.0.0 
ip host dirt 172.16.1.129 
! 
vpdn enable 
vpdn tunnel accounting network m1 
vpdn session accounting network m1 
! 
vpdn-group 1 
accept-dialin 
protocol l2tp 
virtual-template 1 
terminate-from hostname ISP_LAC 
local name ENT_LNS 
! 
isdn switch-type primary-5ess 
! 
! 
fax interface-type modem 
mta receive maximum-recipients 0 
! 
interface Loopback 0 
ip address 172.16.0.101 255.255.255.0 
! 
interface Loopback 1 
ip address 192.168.0.101 255.255.255.0 
! 
interface Ethernet 0 
ip address 10.1.26.71 255.255.255.0 
no ip mroute-cache 
no cdp enable 
! 
interface virtual-template 1 
ip unnumbered Loopback 0 
peer default ip address pool vpdn-pool1 
ppp authentication chap 
! 
interface virtual-template 2 
ip unnumbered Loopback1 
peer default ip address pool vpdn-pool2 
ppp authentication chap 
! 
interface fastethernet 0 
no ip address 
no ip mroute-cache 
shutdown 
duplex auto 
speed auto 
no cdp enable 
! 
ip local pool vpdn-pool1 172.16.5.1 172.16.128.100 
ip local pool vpdn-pool2 10.0.0.1 10.0.0.100 
ip default-gateway 10.1.26.254 
ip classless 
ip route 0.0.0.0 0.0.0.0 10.1.26.254 
ip route 192.168.1.2 255.255.255.255 10.1.26.254 
no ip http server 
ip pim bidir-enable 
! 
! 
dialer-list 1 protocol ip permit 
no cdp run 
! 
! 
radius-server host 172.16.192.80 auth-port 1645 acct-port 1646 key rad123 
radius-server retransmit 3 
call rsvp-sync 
end

Note

For additional accounting examples, see the “Configuring Accounting” chapter in the Cisco IOS XE Security: Secure Services Configuration Guide .

Example Verifying the User Profile on the RADIUS Server

The following is an example user profile on the RADIUS server. The Cisco ASR 1000 Series Aggregation Services Routers retrieves the information in the user profile from the RADIUS server. 


Radius Profile "user1"
Auth-Type = Local, User-Password = "pwd"
User-Service-Type = Framed-User
Framed-Protocol = PPP
cisco-avpair = "lcp:interface-config=vrf forwarding VRF01"
cisco-avpair = "lcp:interface-config=ipv6 unnumbered loopback1"
Framed-IPv6-Prefix = "2001:DB8:4567:1234::/64" 
Delegated-IPv6-Prefix = "2001:DB8:AAAA::/48"

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Cisco IOS XE MPLS commands

Cisco IOS MPLS Command Reference

Authentication, authorization and accounting

Authentication, Authorization, and Accounting (AAA)

Configuring RADIUS

Configuring RADIUS

Configuring accounting

Configuring Accounting

RADIUS attributes

“RADIUS Attributes Overview and RADIUS IETF Attributes” module in the Cisco IOS XE Security Configuration Guide: Securing User Services

Standards

Standard

Title

No new or modified standards are supported, and support for existing standards has not been modified.

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported, and support for existing MIBs has not been modified.

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

RFC 2867

RADIUS Accounting Modifications for Tunnel Protocol Support

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for Configuring Managed IPv6 Layer 2 Tunnel Protocol Network Server

Table 2. Feature Information for Managed IPv6 Layer 2 Tunnel Protocol Network Server

Feature Name

Releases

Feature Information

Managed IPv6 Layer 2 Tunnel Protocol Network Server

Cisco IOS XE Release 3.3S

The Managed IPv6 LNS feature allows the service provider to offer a scalable end-to-end VPN of both IPv4 and IPv6 service to remote users. This feature integrates the Multiprotocol Label Switching (MPLS)-enabled backbone with broadband access capabilities.

The following commands were introduced or modified:

atm pppatm passive, radius-server attribute list, radius-server key, radius-server retransmit, radius-server vsa send.

Managed IPv6 Layer 2 Tunnel Protocol Network Server - VRF-Lite only

Cisco IOS XE Release 3.3S

The Managed IPv6 LNS feature allows the service provider to offer a scalable end-to-end VPN of both IPv4 and IPv6 service to remote users. This feature integrates the VRF-Lite enabled backbone with broadband access capabilities.

Managed IPv6 Layer 2 Tunnel Protocol Network Server - MPLS VPN

Cisco IOS XE Release 3.7S

The Managed IPv6 LNS feature allows the service provider to offer a scalable end-to-end VPN of both IPv4 and IPv6 service to remote users. This feature integrates the MPLS enabled backbone with broadband access capabilities.