Monitoring The Running Status Of L2Tp; Debugging L2Tp Information - Huawei AR1200 series Configuration Manual

Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN
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4.6.2 Monitoring the Running Status of L2TP

In routine maintenance, you can run the L2TP-related display commands to view the running
status of L2TP.
Context
In routine maintenance, you can run the following commands to view the running status of L2TP.
Procedure
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4.6.3 Debugging L2TP Information

When an L2TP fault occurs, you can run the L2TP related debugging commands to debug L2TP
and locate the fault.
Context
When an L2TP fault occurs, run the following debugging commands in the user view to debug
L2TP and locate the fault.
For the procedure of outputting the debugging information, see the chapter "Maintenance and
Debugging" in the Huawei AR1200 Series Enterprise Routers Configuration Guide - System
Management.
Issue 01 (2012-04-20)
If the parameter peer-name is specified, all the tunnels with this name are cleared. If the
parameter tunnel-id is specified, only the tunnel with this tunnel ID is cleared.
A tunnel is cleared when the number of access users is 0, a network fault occurs, or the
administrator needs to disconnect the tunnel.
In addition, either the LAC or the LNS can request for clearing a tunnel initiatively. The
side receiving the clearing request must reply with the Acknowledgement (ACK) message,
and then wait for a certain period before performing the tunnel clearing operation. In this
manner, even if the ACK message is lost, the side can still have time to receive the resent
clearing request.
After an L2TP tunnel is disconnected forcibly, all control and session connections in the
tunnel are cleared. The tunnel can be re-established when a new user dials in.
Run the display l2tp session command to view information about the L2TP session.
Run the display l2tp tunnel command to view information about the L2TP tunnel.
Run the display access-user command to view information about the user sessions.
Run the display l2tp-group command to view information about current L2TP groups.
NOTE
Debugging affects the system performance. So, after the debugging, run the undo debugging all command
to disable it immediately.
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