Configuring IRB Interface on MX Series Device

D

The following configuration (show above in xml format) is the correct answer as it correctly includes the routing-interface irb: set bridge-domains vlan-222 vlan-id 222 set bridge-domains vlan-222 routing-interface irb.0

An Integrated Routing and Bridging (IRB) interface is a logical interface that enables communication between Layer 2 bridging domains and Layer 3 IP routing interfaces on an MX Series device.

The correct configuration to enable an IRB interface on an MX Series device is option D:

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[edit] user@switch# show bridge-domains vlan-222 vlan-id 222; routing-interface irb.0; 

This configuration statement defines the VLAN with ID 222 as a Layer 2 bridging domain and associates it with the Layer 3 IP routing interface irb.0. This enables communication between the VLAN and the IP routing table, allowing the device to route traffic to and from the VLAN.

Option A, which specifies layer3-interface irb.0 within the bridge-domain configuration, is incorrect because it does not explicitly define the bridging domain as a Layer 2 domain. It only associates the interface with the IRB interface, but does not specify that it should be treated as a bridging domain.

Option B, which specifies layer3-interface lt.0 within the bridge-domain configuration, is also incorrect because it associates the VLAN with a Layer 3 logical tunnel (lt.0) rather than an IRB interface.

Option C, which specifies routing-interface lt.0 within the bridge-domain configuration, is incorrect because it also associates the VLAN with a Layer 3 logical tunnel rather than an IRB interface.

Therefore, the correct configuration statement to enable an IRB interface on an MX Series device is:

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[edit] user@switch# show bridge-domains vlan-222 vlan-id 222; routing-interface irb.0;