Configure Interfaces for Layer 2 VPN Routing

On each PE router, you must configure the interfaces over which the Layer 2 VPN traffic travels between PE and CE routers. To do this, include the interface statement at the [edit routing-instances routing-instance-name] hierarchy level:

[edit routing-instances routing-instance-name]

interface interface-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.

A logical interface can be associated with only one routing instance.

If you enable a routing protocol on all instances by specifying interfaces all when configuring the master instance of the protocol at the [edit protocols] hierarchy level and if you configure a specific interface for Layer 2 VPN routing at the [edit routing-instances routing-instance-name] hierarchy level, the latter interface statement takes precedence and the interface is used exclusively for the Layer 2 VPN. If you explicitly configure the same interface name at both the [edit protocols] and [edit routing-instances routing-instance-name] hierarchy levels, when you try to commit the configuration, it will fail.