Types of Tunnel-Service Interfaces

You can configure the following types of tunnel-service interfaces using dedicated tunnel-server ports and shared tunnel-server ports:

Static IP interfaces that you configure and delete
Static IP interfaces include DVMRP and GRE tunnels. You must assign interfaces on other line modules to act as source endpoints for these tunnels. For information about configuring these tunnels, see Configuring IP Tunnels in JUNOSe IP Services Configuration Guide.
Dynamic interfaces associated with an L2TP LNS session
The router establishes dynamic interfaces when required and removes the interfaces when they are not required. For information about applications that use these dynamic interfaces, see L2TP Overview in JUNOSe Broadband Access Configuration Guide .
Secure IP tunnels
IPSec-service modules are associated with secure IP tunnels. You must configure and delete these interfaces statically; however, the router assigns tunnels to the interfaces dynamically. This mechanism means that you must manage the interfaces for tunnels manually: however, the router adds and removes tunnels when required. For information about configuring secure IP tunnels, see Configuring IPSec in JUNOSe IP Services Configuration Guide .