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162 CHAPTER 11: CONFIGURING LOGICAL INTERFACE
3 Create corresponding relation between the virtual-template and related physical
interface
In VPN application environment, it is necessary to build up corresponding relations
between L2TP group and virtual-template. In MP application environment, it is
necessary to build up corresponding relations between MP and virtual-template.
Please see chapters in Operation Manual – VPN and Operation Manual – Link
Layer Protocol for detailed description.
Display and Debug
Virtual-Template and
Virtual Interface
The virtual interface, automatically created by the system if necessary, will work by
using parameters of related virtual-template. So, it's unnecessary for manual
configuration. The virtual interface will be deleted because of low-layer link
disconnection or user intervention.
The following command can be used to display the state of virtual-template in all
views.
Table 193 Display state of the specified virtual-template
Troubleshooting Before checking and eliminating faults of virtual-template, first find out the
virtual-template is used to create VPN virtual access interface or MP virtual
interface, then locate the fault of the virtual-template in actual application
environment.
Fault 1: Fail to create virtual interface.
Troubleshooting: the reasons may be as follows:
■ The virtual-template is not configured with IP address. Therefore, PPP
consultation fails and the virtual interface can't turn to Up state.
■ The virtual-template is not configured with IP address (or IP address pool)
allocated to the opposite end. If it is required to allocate addresses to the
opposite end in actual application, the virtual interface cannot meet the
requirement, nor turn to Up state.
■ PPP authentication parameter is set incorrectly. If the opposite end is not the
user defined by the router, PPP consultation will also fail.
Please see related chapters of Operation Manual – VPN and Operation Manual –
Link Layer Protocol for more methods of fault diagnosis and troubleshooting of
virtual-template.
Operation Command
Display the state of the specified
virtual-template
display interfaces
virtual-template
virtual-template-number