- VPDN Technology Overview
- Configuring AAA for VPDNs
- Configuring NAS-Initiated Dial-In VPDN Tunneling
- Configuring Multihop VPDN
- Configuring Additional VPDN Features
- VPDN Tunnel Management
- Configuring L2TP HA Session SSO ISSU on a LAC LNS
- L2TP Disconnect Cause Information
- Configuring the Managed IPv6 Layer 2 Tunnel Protocol Network Server
- ISDN/Dialer Access-Link Support for Broadband Aggregation
- Finding Feature Information
- Prerequisites for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Restrictions for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Information About ISDN/Dialer Access-Link Support for Broadband Aggregation
- How to Configure ISDN/Dialer Access-Link Support for Broadband Aggregation
- Verifying ISDN/Dialer Access-Link Support for Broadband Aggregation
- Configuration Examples for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Additional References
- Feature Information for ISDN/Dialer Access-Link Support for Broadband Aggregation
ISDN/Dialer Access-Link Support for Broadband Aggregation
The ISDN/Dialer Access-Link Support for Broadband Aggregation feature provides client connectivity to a network through PPP connections by using an ISDN PRI Layer 2 Tunneling Protocol (L2TP) access concentrator (LAC) session over IPv4.
This module describes how to configure the ISDN and dialer access-link support for broadband aggregation.
- Finding Feature Information
- Prerequisites for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Restrictions for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Information About ISDN/Dialer Access-Link Support for Broadband Aggregation
- How to Configure ISDN/Dialer Access-Link Support for Broadband Aggregation
- Verifying ISDN/Dialer Access-Link Support for Broadband Aggregation
- Configuration Examples for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Additional References
- Feature Information for ISDN/Dialer Access-Link Support for Broadband Aggregation
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 table.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for ISDN/Dialer Access-Link Support for Broadband Aggregation
-
You must configure a Layer 2 Tunneling Protocol (L2TP) network server (LNS) and enable IPv4 before configuring ISDN support for broadband.
-
Ensure that the ISDN/Dialer Access-Link Support for Broadband Aggregation feature installs correctly by enabling the activation of the adventerprise license upon the next reload.
enable configure terminal license boot level adventerprise end
Restrictions for ISDN/Dialer Access-Link Support for Broadband Aggregation
-
Only IPv4 PPP sessions inside Layer 2 Tunneling Protocol (L2TP) version 2 tunnels are supported.
-
ISDN termination is not supported on the dialer interface or on the d-channel interface. To achieve PPP termination and aggregation (PTA), the router will need to act as a L2TP Access Concentrator (LAC) and forward incoming ISDN calls to a L2TP Network Server (LNS).
Information About ISDN/Dialer Access-Link Support for Broadband Aggregation
Deployment Model for ISDN/Dialer Access-Link Support for Broadband Aggregation
The ISDN/Dialer Access-Link Support for Broadband Aggregation feature provides support for ISDN and dialer PRI access link to broadband PPP IPv4 sessions at the Layer 2 Tunneling Protocol (L2TP) network server (LNS). These sessions are carried over PPP by the L2TP access concentrator (LAC) using ISDN over IPv4. The sessions are sent from the LAC to the LNS through L2TP tunnels. The LNS terminates the PPP sessions and assigns a network layer address to the client. The client data in the IPv4 packet is then routed to the ISP or a corporate network and forwarded to the final destination. The LNS also performs authentication, authorization, and accounting (AAA) actions on the PPP sessions. The figure below describes the deployment model.
How to Configure ISDN/Dialer Access-Link Support for Broadband Aggregation
Note | Before you can configure the ISDN switch type on an interface, you must configure a global ISDN switch type by using the isdn switch-type global configuration command. Because global commands are processed before interface-level commands, the command parser does not accept the isdn switch-type command on an interface unless a switch type is first added globally. |
- Configuring an L2TP Access Concentrator
- Configuring a PRI Group
- Configuring a Dialer for an ISDN PRI Interface
- Configuring a Dialer Interface by Enabling PPP Authentication
Configuring an L2TP Access Concentrator
Perform this task to configure a virtual private dial-up network (VPDN), a Layer 2 Tunneling Protocol (L2TP) access concentrator (LAC), and an ISDN switch type.
1.
enable
2.
configure
terminal
3.
vpdn
enable
4.
vpdn search-order domain dnis
5.
vpdn-group
group-name
6.
request-dialin
7.
protocol l2tp
8.
domain
domain-name
9.
exit
10.
initiate-to ip
ip-address
11.
local name
host-name
12.
l2tp tunnel password
password
13.
exit
14.
isdn switch-type
switch-type
15.
end
DETAILED STEPS
Configuring a PRI Group
Perform this task to specify an ISDN switch type and to configure a PRI group.
1.
enable
2.
configure
terminal
3.
isdn
switch-type
switch-type
4.
controller
{T1 |
E1}
slot/port
5.
framing esf
6.
linecode
{ami |
b8zs |
hdb3}
7.
cablelength
long
db-gain-value
db-loss-value
8.
pri-group
timeslots
timeslot-range
9.
end
DETAILED STEPS
Configuring a Dialer for an ISDN PRI Interface
1.
enable
2.
configure
terminal
3.
interface
serial
controller-number:time-slot
4.
no ip address
5.
dialer rotary-group
interface-number
6.
dialer-group
group-number
7.
exit
8.
isdn switch-type
switch-type
9.
isdn timer
timer milliseconds
10.
isdn skipsend-idverify
11.
end
DETAILED STEPS
Configuring a Dialer Interface by Enabling PPP Authentication
1.
enable
2.
configure
terminal
3.
interface
dialer
dialer-rotary-group-number
4.
no ip address
5.
encapsulation
encapsulation-type
6.
dialer in-band
7.
dialer idle-timeout
seconds
8.
dialer-group
group-number
9.
no peer default ip address
10.
ppp authentication
protocol1 [protocol2...] [if-needed |
list-name |
default |
callin |
one-time |
optional]
11.
exit
12.
dialer-list
dialer-group
protocol
protocol-name {permit |
deny |
list
access-list-number |
access-group}
13.
end
DETAILED STEPS
Verifying ISDN/Dialer Access-Link Support for Broadband Aggregation
1.
enable
2.
show ppp all
3.
show vpdn
DETAILED STEPS
Troubleshooting Tips
-
debug dialer—Displays debugging information about the packets received on a dialer interface.
-
debug isdn q931—Displays information about call setup and teardown of ISDN network connections (Layer 3) between the local router (user side) and the network.
-
debug ppp authentication—Displays authentication protocol messages, including Challenge Handshake Authentication Protocol (CHAP) packet exchanges and Password Authentication Protocol (PAP) exchanges.
-
debug ppp negotiation—Displays information on traffic and exchanges of PPP packets sent during PPP startup, when PPP options are negotiated.
Configuration Examples for ISDN/Dialer Access-Link Support for Broadband Aggregation
- Example: Configuring an L2TP Access Concentrator
- Example: Configuring a PRI Group
- Example: Configuring a Dialer for an ISDN PRI Interface
- Example: Configuring a Dialer Interface by Enabling PPP Authentication
Example: Configuring an L2TP Access Concentrator
The following example shows how to configure the Layer 2 Tunneling Protocol (L2TP) access concentrator (LAC):
Device(config)# vpdn enable Device(config)# vpdn search-order domain dnis Device(config)# vpdn-group group1 Device(config-vpdn)# request-dialin Device(config-vpdn-req-in)# protocol l2tp Device(config-vpdn-req-in)# domain xyz.com Device(config-vpdn-req-in)# exit Device(config-vpdn)# initiate-to ip 192.0.2.55 Device(config-vpdn)# local name host1 Device(config-vpdn)# l2tp tunnel password password1 Device(config-vpdn)# exit Device(config)# isdn switch-type primary-4ess
Example: Configuring a PRI Group
The following example shows how to specify the ISDN PRI on the T1 controller for slot 0, port 1, and configures time slots 1 to 2:
Device(config)# isdn switch-type primary-ni Device(config)# controller T1 0/1 Device(config-controller)# framing esf Device(config-controller)# linecode b8zs Device(config-controller)# cablelength long gain36 0db Device(config-controller)# pri-group timeslots 1-2
Example: Configuring a Dialer for an ISDN PRI Interface
The following example shows how to specify the dialer profile configuration for an ISDN PRI interface:
Device(config)# interface serial 0/1/7:23 Device(config-if)# no ip address Device(config-if)# dialer rotary-group 100 Device(config-if)# dialer-group group1 Device(config-if)# exit Device(config)# isdn switch-type primary-4ess Device(config)# isdn timer T321 30000 Device(config)# isdn skipsend-idverify
Example: Configuring a Dialer Interface by Enabling PPP Authentication
Device(config)# interface dialer 100 Device(config-if)# no ip address Device(config-if)# encapsulation ppp Device(config-if)# dialer in-band Device(config-if)# dialer idle-timeout 5000 Device(config-if)# dialer-group group1 Device(config-if)# no peer default ip address Device(config-if)# ppp authentication chap callin Device(config-if)# exit Device(config)# dialer-list dialergroup1 protocol ip permit
Additional References
Related Documents
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
|
Broadband and DSL commands |
Cisco IOS Broadband Access Aggregation and DSL Command Reference |
Dial commands |
|
VPDN commands |
|
Broadband and DSL configuration |
Broadband Access Aggregation and DSL Configuration Guide |
Technical support documentation for L2TP |
Layer 2 Tunnel Protocol (L2TP) |
Technical support documentation for PPP |
Point-to-Point Protocol (PPP) |
Standards and RFCs
Standard/RFC |
Title |
---|---|
RFC 1661 |
Point-to-Point Protocol (PPP) |
RFC 2661 |
Layer Two Tunneling Protocol (L2TP) |
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. |
Feature Information for ISDN/Dialer Access-Link Support for Broadband Aggregation
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.Feature Name |
Releases |
Feature Information |
---|---|---|
ISDN/Dialer Access-Link Support for Broadband Aggregation |
Cisco IOS XE Release 3.8S |
The ISDN/Dialer Access-Link Support for Broadband Aggregation feature provides client connectivity to a network through PPP by using an ISDN PRI LAC session over IPv4. |