L2TP configuration task list

When you configure L2TP, perform the following tasks:

Determine the network devices needed according to the networking environment.
- For NAS-initiated mode and LAC-auto-initiated mode, configure both the LAC and the LNS.
- For client-initiated mode, you only need to configure the LNS.
Configure the devices based on the intended role (LAC or LNS) on the network.

To configure a device as an LAC in NAS-initiated or LAC-auto-initiated mode, complete the following tasks:

Tasks at a glance	Remarks
(Required.) Configuring basic L2TP capabilities	N/A
Configuring an LAC: (Required.) Configuring an LAC to initiate tunneling requests for a user (Required.) Specifying LNS IP addresses (Optional) Configuring the source IP address of L2TP tunnel packets (Optional.) Enabling transferring AVP data in hidden mode (Required.) Configuring AAA authentication on an LAC (Required.) Configuring an LAC to automatically establish an L2TP tunnel	The first and fifth tasks are required for NAS-initiated mode and unnecessary for LAC-auto-initiated mode. The last task is required for LAC-auto-initiated mode and unnecessary for NAS-initiated mode.
(Optional.) Configuring optional L2TP parameters: Configuring L2TP tunnel authentication Setting the Hello interval Setting the DSCP value of L2TP packets Assigning a tunnel peer to a VPN Setting the TSA ID of the LTS	N/A

Tasks at a glance

Remarks

N/A

The first and fifth tasks are required for NAS-initiated mode and unnecessary for LAC-auto-initiated mode.

The last task is required for LAC-auto-initiated mode and unnecessary for NAS-initiated mode.

N/A

To configure a device as an LNS in NAS-initiated, client-initiated, or LAC-auto-initiated mode, complete the following tasks:

Tasks at a glance
(Required.) Configuring basic L2TP capabilities
Configuring an LNS: (Required.) Creating a VT interface (Optional.) Configuring a VA pool (Required.) Configuring an LNS to accept L2TP tunneling requests from an LAC (Optional.) Configuring user authentication on an LNS (Optional.) Configuring AAA authentication on an LNS
(Optional.) Configuring optional L2TP parameters: Configuring L2TP tunnel authentication Setting the Hello interval Setting the DSCP value of L2TP packets Assigning a tunnel peer to a VPN Setting the TSA ID of the LTS
(Optional.) Enabling L2TP-based EAD
(Optional.) Configuring IMSI/SN binding authentication

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