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Configuring Layer 2 Bridging Interfaces

Integrated routing and bridging interfaces are logical Layer 3 VLAN interfaces that route traffic between bridge domains (VLANs). So, an IRB logical interface is usually associated with a bridge domain or VLAN. The IRB logical interface also functions as the gateway IP address for the other devices on the same sub-network that are associated with the same VLAN. IRB interfaces support Layer 2 bridging and Layer 3 routing on the same interface. As a result, IRB interfaces enable the router to act both as a router and as a Layer 2 switch at the same time.


If the status of all Layer 2 logical interfaces in the bridge domain is down, the status of the irb logical interface is also down.

To configure an IRB logical interface:

  1. In configuration mode, at the [edit bridge-domains] hierarchy level, configure the bridge domain by specifying the name of the bridge and the VLAN ID.
  2. Configure an interface in trunk mode and include the interface in the appropriate bridge domain using the vlan-id-list command at the [edit interfaces] hierarchy level.
  3. Configure the IRB interface at the [edit interfaces] hierarchy level and specify the associated IP address.
  4. Configure the IRB interface as the routing interface for the bridge domain at the [edit bridge-domains] hierarchy level.