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You can configure an IRB logical interface at the [edit interfaces ge-fpc /pic/port unit logical-unit-number] hierarchy level:

[edit interfaces ge-fpc/pic/port]unit logical-unit-number {}

You can configure Layer 3 information on the IRB logical interface by including the irb statement at the [edit interfaces] hierarchy level:

[edit interfaces]

irb {unit logical-unit-number {family inet {address address {}}}}

For examples of Layer 2 bridging configuration, see the Junos OS Routing Protocols Configuration Guide.

The following example configures an IRB logical interface and Layer 3 information on the interface.

[edit interfaces]

ge-1/0/0 {unit 0 {}}

irb {unit 0 {family inet {address 192.168.12.1/28;}}}