Cisco 10000-2P2-2DC Software Guide - Page 218

Authentication Protocol CHAP packet exchanges.

Page 218 highlights

L2TP Network Server Chapter 5 Configuring the Layer 2 Tunnel Protocol Access Concentrator and Network Server Command Router# show vpdn tunnel Router# show vpdn tunnel all Router# debug aaa accounting Router# debug aaa authorization Router# debug ppp chap Router# debug ppp negotiation Router# debug ppp negotiation chap Router# debug radius Router# debug vpdn events Router# debug vpdn errors Purpose Displays information about all active L2TP tunnels in a VPDN. Displays information about all active L2TP tunnels. Displays information on accountable events as they occur. Displays information on AAA authorization. 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. Displays information on traffic and exchanges in an internetwork implementing PPP. Used to decipher a CHAP negotiation problem due to a connectivity problem between a Cisco and non-Cisco device. Displays information associated with RADIUS. Displays L2TP errors and events that are a part of normal tunnel establishment or shutdown for VPNs. Displays errors that prevent a tunnel from being established or errors that cause an established tunnel to be closed. Caution Because debugging output is assigned high priority in the CPU process, it can render the system unusable. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco Systems technical support personnel. Moreover, it is best to use debug commands during periods of lower network traffic and fewer users. Debugging during these periods decreases the likelihood that increased debug command processing overhead will affect system use. 5-52 Cisco 10000 Series Router Software Configuration Guide OL-2226-23

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5-52
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 5
Configuring the Layer 2 Tunnel Protocol Access Concentrator and Network Server
L2TP Network Server
Caution
Because debugging output is assigned high priority in the CPU process, it can render the system
unusable. For this reason, use debug commands only to troubleshoot specific problems or during
troubleshooting sessions with Cisco Systems technical support personnel. Moreover, it is best to use
debug commands during periods of lower network traffic and fewer users. Debugging during these
periods decreases the likelihood that increased debug command processing overhead will affect system
use.
Router#
show vpdn tunnel
Displays information about all active L2TP tunnels in a VPDN.
Router#
show vpdn tunnel all
Displays information about all active L2TP tunnels.
Router#
debug aaa accounting
Displays information on accountable events as they occur.
Router#
debug aaa authorization
Displays information on AAA authorization.
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.
Router#
debug ppp negotiation
Displays information on traffic and exchanges in an internetwork
implementing PPP.
Router#
debug ppp negotiation chap
Used to decipher a CHAP negotiation problem due to a
connectivity problem between a Cisco and non-Cisco device.
Router#
debug radius
Displays information associated with RADIUS.
Router#
debug vpdn events
Displays L2TP errors and events that are a part of normal tunnel
establishment or shutdown for VPNs.
Router#
debug vpdn errors
Displays errors that prevent a tunnel from being established or
errors that cause an established tunnel to be closed.
Command
Purpose