Cisco 10000-2P2-2DC Software Configuration Manual page 218

L2TP 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
Because debugging output is assigned high priority in the CPU process, it can render the system
Caution
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.
Cisco 10000 Series Router Software Configuration Guide
5-52
Chapter 5 Configuring the Layer 2 Tunnel Protocol Access Concentrator and Network Server
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.
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