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Configuring Logical Tunnel Interfaces

• On M Series, MX Series, and T Series routers, logical tunnel interfaces allow you to connect logical systems, virtual routers, or VPN instances. M Series and T Series routers must be equipped with a Tunnel Services PIC or an Adaptive Services Module (only available on M7i routers). MX Series routers must be equipped with a Trio MPC/MIC module. For more information about connecting these applications, see the Junos OS VPNs Configuration Guide.
• On SRX Series Services Gateways, the logical tunnel interface is used to interconnect logical systems. See the Junos OS Logical Systems Configuration Guide for Security Devices.
• On J Series Services Routers, the logical tunnel interface is used to provide class-of-service (CoS) support for real-time performance monitoring (RPM) probe packets. Packets are routed to this internal interface for services. See the Junos OS Class of Service Configuration Guide for Security Devices.

For M Series, MX Series, and T Series routers, see the following section:

Connecting Logical Systems

To connect two logical systems, you configure a logical tunnel interface on both logical systems. Then you configure a peer relationship between the logical tunnel interfaces, thus creating a point-to-point connection.

To configure a point-to-point connection between two logical systems, configure the logical tunnel interface by including the lt-fpc/pic/port statement:

You can include this statement at the following hierarchy levels:

• [edit interfaces]
• [edit logical-systems logical-system-name interfaces]

• You can configure each logical tunnel interface with one of the following encapsulation types: Ethernet, Ethernet circuit cross-connect (CCC), Ethernet VPLS, Frame Relay, Frame Relay CCC, VLAN, VLAN CCC, or VLAN VPLS.
• You can configure the IP, IPv6, International Organization for Standardization (ISO), or MPLS protocol family.
• The peering logical interfaces must belong to the same logical tunnel interface derived from the Tunnel Services PIC or Adaptive Services Module.
• You can configure only one peer unit for each logical interface. For example, unit 0 cannot peer with both unit 1 and unit 2.
• To enable the logical tunnel interface, you must configure at least one physical interface statement.
• Logical tunnels are not supported with Adaptive Services, Multiservices, or Link Services PICs (but they are supported on the Adaptive Services Module on M7i routers, as noted above).
• On M Series routers other than the M40e router, logical tunnel interfaces require an Enhanced Flexible PIC Concentrator (FPC).
• On MX Series routers, logical tunnel interfaces require Trio MPC/MIC modules. They do not require a Tunnel Services PIC in the same system.

For more information about configuring logical systems, see the Junos OS Routing Protocols Configuration Guide.