3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 2 Configuration of L2TP3Com Corporation2-162.3.1 Enabling L2TPOnly after L2TP is enabled can L2TP functions on the router work normally. If L2TP isdisabled, the router cannot provide related functions even if parameters of L2TP havebeen configured.These configurations are compulsory on LNS side.Perform the following configuration in system view.Table 2-19 Enable/disable L2TPOperation CommandEnable L2TP. l2tp enableDisable L2TP. undo l2tp enableBy default, L2TP is disabled.2.3.2 Enabling L2TP Multi-Instance FunctionOnly when L2TP multi-instance function is enabled can the router perform LNS forseveral enterprises. L2TP multi-instance function, mainly used in MPLS-VPNnetworking, enriches VPN networking portfolio. In actual networking applications,intranet routing is accomplished by vpn-instance. For configurations of vpn-instance,refer to chapters related to MPLS configurations. In Section 2.5.4 L2TP Multi-InstanceNetworking Application, a brief configuration procedure is described.In L2TP multi-instance applications, these configurations are compulsory at LNS side.Perform the following configuration in system view.Table 2-20 Enable/disable L2TP multi-instance functionOperation CommandEnable L2TP multi-instance function. l2tpmoreexam enableDisable L2TP multi-instance function. undo l2tpmoreexam enableBy default, L2TP multi-instance function is disabled. This function is not available whenthe LAC does not employ agent authentication.2.3.3 Creating L2TP GroupL2TP group needs to be created in order to fulfill related parameter configurations ofL2TP. It allows you not only to configure L2TP functions on the router as needed butalso to implement one-to-one and one-to-many networking applications between LACand LNS easily. L2TP groups are numbered separately on LAC and LNS, so LAC and
