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Configuring Shared Interfaces on a PSD

1. Configure the physical interface at the [edit interfaces] hierarchy level by doing one of the following:
   • Configure the physical SONET interface using the so-fpc/pic/slot statement.
   • Configure the physical Gigabit Ethernet interface using the ge-fpc/pic/slot statement.
   • Configure the physical 10-Gigabit Ethernet interface using the xe-fpc/pic/slot statement.
2. Configure Frame Relay encapsulation or VLAN tagging:
   • For Frame Relay encapsulation, use the encapsulation frame-relay statement at the [edit interfaces so-fpc/pic/slot] hierarchy level.
   • For VLAN tagging, use the vlan-tagging statement at one of the following hierarchy levels: [edit interfaces ge-fpc/pic/slot] or [edit interfaces xe-fpc/pic/slot].
3. Identify the physical interface as a shared interface by including the shared-interface statement at one of the following hierarchy levels: [edit interfaces so-fpc/pic/slot], [edit interfaces ge-fpc/pic/slot], or [edit interfaces xe-fpc/pic/slot].

   Note: For Ethernet shared interfaces on the JCS 1200 platform, gratuitous-arp configuration statements are supported on the Root System Domain (RSD), but not on the Protected System Domain (PSD). These statements are configured at the [edit interfaces ge-fpc/pic/slot] hierarchy level. These statements include: gratuitous-arp-reply, no-gratuitous-arp-replay, and no-gratuitous-arp-request. Values you configure for gratuitous-arp statements on the RSD are not passed to the PSD.

4. Configure logical interfaces under the physical interface using the unit logical-unit-number statement at one of the following hierarchy levels: [edit interfaces so-fpc/pic/slot], or [edit interfaces ge-fpc/pic/slot], or [edit interfaces xe-fpc/pic/slot]. The values for logical-unit-number must match the values set in the RSD configuration.
5. For each logical interface, include the following statements:
   • For SONET interfaces, include the dlci dlci-identifier statement at the [edit interfaces so-fpc/pic/slot unit logical-unit-number] hierarchy level to assign a data-link connection identifier (DLCI) for the point-to-point Frame Relay connection between the RSD and the PSD. The value for dlci-identifier must match the value set in the RSD configuration for the specified logical SONET interface.
   • For Gigabit Ethernet interfaces, include the vlan-id number statement at one of the following hierarchy levels: [edit interfaces ge-fpc/pic/slot unit logical-unit-number] or [edit interfaces xe-fpc/pic/slot unit logical-unit-number] to bind an 802.1Q VLAN identifier tag to the logical interface. The value for number must match the value set in the RSD configuration for the specified logical Gigabit Ethernet interface.
6. For each logical interface, include the peer-interface interface-name statement to configure the tunnel peer interface that is bound to the logical interface.
7. For each logical interface, include the family family statement to configure the protocol family for the logical interface.
8. Configure the IP address of the logical interface using the address address statement at one of the following hierarchy levels: [edit interfaces so-fpc/pic/slot unit logical-unit-number family family], or [edit interfaces ge-fpc/pic/slot unit logical-unit-number family family], or [edit interfaces xe-fpc/pic/slot unit logical-unit-number family family].
9. Configure the physical tunnel interface using the ut-fpc/pic/slot statement at the [edit interfaces] hierarchy level.
10. Configure the logical tunnel interfaces using the unit logical-unit-number statement at the [ut-fpc/pic/slot] hierarchy level.

    The logical unit number must match the value of the logical unit number for the physical shared interface. For example, if the shared interface logical unit is 1 (as part of so-0/0/0.1), configure ut-0/0/0.1 as the logical peer tunnel interface.

11. For each logical tunnel interface, specify the logical peer interface on the SONET, Gigabit Ethernet, or 10-Gigabit Ethernet PIC using the peer-interface statement at the [ut-fpc/pic/slot unit logical-unit-number] hierarchy level.

    As described in Step 10, the logical unit number for the shared interface and the uplink tunnel interface must match.