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The L2TP Disconnect Cause Information feature adds support for additional Layer 2 Tunnel Protocol (L2TP) disconnect error codes using attribute-value (AV) pair 46 as specified by RFC 3145. Prior to the introduction of this feature, L2TP hosts could not exchange PPP disconnect error codes.
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 Table at the end of this document.
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L2TP disconnect cause codes allow the devices functioning as L2TP hosts to exchange PPP-related disconnect cause information. Normally L2TP operation is isolated from details of the PPP session that is being encapsulated. AV pair 46 PPP Disconnect Cause Code is used to exchange PPP-related disconnect cause information between L2TP hosts. The information can be translated to the appropriate authentication, authorization, and accounting (AAA) code and relayed to the remote RADIUS AAA server.
When L2TP service fails or session establishment is unsuccessful, PPP-specific disconnect information provides valuable information that can be used for troubleshooting or accounting purposes. The lack of this information is a problem particularly when the L2TP hosts are not owned or managed by the same entities. The L2TP Disconnect Cause Information feature enables service providers to determine the specific failure reason, facilitating analysis and error correction.
The table below lists the supported L2TP disconnect cause codes from RFC 3145 and a brief description of the codes.
Table 1 | L2TP Disconnect Cause Codes |
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
|
Information about configuring L2TP VPDN tunnels |
VPDN Tunnel Management module |
VPDN commands |
Cisco IOS VPDN Command Reference |
Standard |
Title |
---|---|
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
-- |
MIB |
MIBs Link |
---|---|
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFC |
Title |
---|---|
RFC 3145 |
L2TP Disconnect Cause Information |
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. |
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.
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Table 2 | Feature Information for the L2TP Disconnect Cause Information Feature |
Feature Name |
Releases |
Feature Information |
---|---|---|
L2TP Disconnect Cause Information |
Cisco IOS XE Release 2.1 |
This feature was introduced on the Cisco ASR 1000 Series Aggregation Services Routers. The L2TP Disconnect Cause Information feature adds support for additional Layer 2 Tunnel Protocol (L2TP) disconnect error codes using attribute-value (AV) pair 46 as specified by RFC 3145. Prior to the introduction of this feature, L2TP hosts could not exchange PPP disconnect error codes. No commands were introduced or modified by this feature. |
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