Configure Logical Interfaces Between Participating Routers

You must configure an interface to each customer router participating in the routing instance and to each provider router participating in the routing instance. Each virtual-router routing instance requires its own separate logical interfaces to all routers participating in the instance. To configure interfaces for virtual-router instances, include the interface statement:

interface interface-name; 

You can configure this statement at the following hierarchy levels:

• [edit routing-instances routing-instance-name]
• [edit logical-routers logical-router-name routing-instances routing-instance-name]

Specify both the physical and logical portions of the interface name, in the following format:

physical.logical

For example, in at-1/2/1.2, at-1/2/1 is the physical portion of the interface name and 2 is the logical portion. If you do not specify the logical portion of the interface name, 0 is set by default.

You must also configure the interfaces at the [edit interfaces] hierarchy level.

One method of providing this logical interface between the provider routers is by configuring tunnels between them. You can configure IPSec, GRE, or IP-IP tunnels between the provider routers, terminating the tunnels at the virtual-router instance.

For information on how to configure tunnels and interfaces, see the JUNOS Internet Software Configuration Guide: Services Interfaces.