257L2TP tasks at a glanceWhen you configure L2TP, perform the following tasks:1. 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.2. 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 followingtasks:Tasks at a glance Remarks(Required.) Configuring basic L2TP capabilities N/AConfiguring an LAC:• (Required.) Configuring an LAC to initiate tunneling requests for auser• (Required.) Specifying LNS IP addresses• (Optional) Configuring the source IP address of L2TP tunnelpackets• (Optional) Configuring each L2TP user to use an L2TP tunnelexclusively• (Optional.) Enabling transferring AVP data in hidden mode• (Required.) Configuring AAA authentication on an LAC• (Required.) Configuring an LAC to automatically establish an L2TPtunnelThe first and fifth tasks arerequired for NAS-initiated modeand unnecessary forLAC-auto-initiated mode.The last task is required forLAC-auto-initiated mode andunnecessary for NAS-initiatedmode.(Optional.) Configuring optional L2TP parameters:• Configuring L2TP tunnel authentication• Setting the Hello interval• Setting the DSCP value of L2TP packets• Setting the TSA ID of the LTSN/ATo 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 capabilitiesConfiguring an LNS:• (Required.) Creating a VT interface• (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.) Setting the maximum number of ICRQ packets that the LNS can process per second(Optional.) Configuring optional L2TP parameters:• Configuring L2TP tunnel authentication• Setting the Hello interval• Setting the DSCP value of L2TP packets• Setting the TSA ID of the LTS(Optional.) Enabling L2TP-based EAD(Optional.) Configuring IMSI/SN binding authentication on the LNS
