Configuring The Tunnel-Hold Function Of L2Tp; Setting Lac To Function As Client - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide

2.2.12 Configuring the Tunnel-Hold Function of L2TP

Normally, the LAC sets up a tunnel with the LNS only when receiving an L2TP session
request from a PPP user. This tunnel is automatically torn down after all PPP sessions
are disconnected.
For some applications that require fast connection setup, however, a tunnel must be
available beforehand so that the system can set up a session immediately after
receiving a PPP session request. To this end, the LAC and the LNS must always
maintain a tunnel connection even when no session is present on it.
Perform the following configuration in L2TP group view.
Table 2-14 Configure the tunnel-hold function of L2TP
Enable the tunnel-hold function of L2TP
Disable the tunnel-hold function of L2TP
By default, the tunnel-hold function of L2TP is disabled.
Note:
To have the tunnel-hold function take effect, you must configure it on both LAC and
LNS.
After you configure the tunnel-tunnel function of L2TP, you can execute the start l2tp
tunnel command to start a tunnel connection.
Perform the following configuration in L2TP group view.
Table 2-15 Start an L2TP tunnel connection
Start an L2TP tunnel connection

2.2.13 Setting LAC to Function as Client

Normally, the L2TP client is the host that dials to the LAC, where the connection
between the user and the LAC is always PPP connection.
If the LAC is functioning as the client, the connection between the host and the LAC can
be an IP connection allowing the LAC to forward the IP packets from the host to the
LNS. This is equivalent to creating a virtual PPP user associated with multiple actual
Operation
Operation
3Com Corporation
2-13
Chapter 2 Configuration of L2TP
Command
tunnel keepstanding
undo tunnel keepstanding
Command
start l2tp tunnel