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9-10
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 9 Configuring Multihop
Monitoring and Maintaining Multihop Configurations
Command Purpose
Router# show running-config
Displays the current router configuration. Use the output of this
command to ensure that the configuration:
• Enables VPDN and multihop functionality
• Terminates tunnels from the LAC
• Maps the ingress tunnel name to the LNS
• Performs VPDN tunnel authorization searches by ingress
tunnel name
• (Optional) Configures an accept-dialin and request-dialout
VPDN group to preserve the TOS field of L2TP tunneled
IP
packets
Router# show vpdn
Displays information about active L2TP tunnels and sessions.
Router# show vpdn session [all [interface |
tunnel | username] | packets | sequence | state |
timers | window]
Displays VPDN session information including interface, tunnel,
username, packets, status, and window statistics.
Router# show vpdn tunnel [all [id | local-name |
remote-name] | packets | state | summary |
transport]
Displays VPDN tunnel information including tunnel protocol,
ID, local and remote tunnel names, packets sent and received,
tunnel, and transport status.
Router# show interface virtual-access number
Displays information about the virtual access interface, LCP,
protocol states, and interface statistics. The following
information indicates a normal working status for the virtual
access interface (# indicates the number of the VAI):
Virtual-Access# is up, line protocol is up
Router# clear vpdn tunnel [l2tp [remote-name |
local-name]]
Shuts down a specific tunnel and all the sessions within the
tunnel.
Router# debug vpdn event [protocol |
flow-control]
Displays VPDN errors and basic events within the L2TP
protocol. Also displays errors associated with flow control.
Note Flow control is only possible if you use L2TP and you
configure the remote peer receive window with a value
greater than zero.
Router# debug vpdn error
Displays errors that prevent a tunnel from being established or
errors that cause an established tunnel to be closed.
Router# debug vpdn packet [control | data]
[detail]
Displays protocol-specific packet header information, such as
sequence numbers, flags, and length.
Router# debug vpdn 12x-events
Displays L2TP events that are part of tunnel establishment or
shutdown.
Router# debug vpdn 12x-errors
Displays L2TP protocol errors that prevent tunnel establishment
or normal operation.
Router# debug vpdn 12x-packets
Displays the dialog between the LAC and LNS for tunnel or
session creation.
Router# debug vpdn 12x-data
Checks L2TP data transfer.