4000 Router Series Layer 2 - WAN Configuration Guide

Step Command Remarks

9. (Optional.) Configure the

expected bandwidth of the

interface.

bandwidth bandwidth-value

By default, the expected

bandwidth (in kbps) is 0.

10. (Optional.) Restore the default

settings for the interface.

default N/A

11. (Optional.) Bring up the

interface.

undo shutdown By default, an interface is up.

Configuring an LNS

An LNS responds to the tunneling requests from an LAC, authenticates users, and assigns IP addresses to

users.

Creating a VT interface

After an L2TP session is established, a virtual access (VA) interface is needed for data exchange with the

peer. The system will dynamically create VA interfaces based on the parameters of the virtual template

(VT) interface. To configure an LNS, first create a VT interface and configure parameters for it. These

parameters include the following:

• Interface IP address

• Authentication mode for PPP users

• IP addresses allocated by the LNS to PPP users

For information about configuring VT interfaces, see "Configuring PPP and MP" and Layer 3—IP Services

Configuration Guide.

Configuring an LNS to accept L2TP tunneling requests from a

specified LAC

When receiving a tunneling request, an LNS determines whether to accept the tunneling request by

checking whether the name of the tunnel peer (LAC) matches the one configured, and determines the VT

interface to be used for creating the VA interface.

To configure an LNS to accept L2TP tunneling requests from a specified LAC:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter L2TP group view in LNS

mode.

l2tp-group group-number [ mode

lns ]

N/A