This section describes the types of tunnel-server ports that you can configure on
tunnel-server modules and the types of tunnel-service interfaces that you can run on
these ports.
Types of Tunnel-Server Ports
E-series routers support two types of tunnel-server ports:
dedicated
tunnel-server
ports and
shared
tunnel-server ports.
Dedicated Tunnel-Server Ports
Dedicated tunnel-server ports are virtual ports that are always present on dedicated
tunnel-server modules. These modules offer only tunnel services; they do not offer
access services.
Shared Tunnel-Server Ports
Shared tunnel-server ports are virtual ports that are always present on certain E-series
line modules that provide tunnel services in addition to regular access services. You
can configure the shared tunnel-server port to use a portion of the module’s bandwidth
to provide tunnel services.
Shared tunnel-server ports offer the following benefits:
■
Greater flexibility in deploying tunnel servers
You can use a shared tunnel-server module to provide tunnel services as an
alternative to using a dedicated tunnel-server module.
■
Cost savings
If you have limited tunnel-server processing needs, you can provide tunnel
services on a single available port of a shared tunnel-server module instead of
having to allocate the entire bandwidth of a dedicated tunnel-server module for
this purpose.
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
212
■
Tunnel-Service and IPSec-Service Overview
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