An integrated routing and bridging, IRB, device, comprising: one or more processors to: activate a layer 3 interface of the IRB device based on activation of a first layer 2 interface associated with the layer 3 interface; detect activation of a second layer 2 interface, associated with the layer 3 interface, after activating the layer 3 interface; activate a filter to prevent transfer of layer 3 network traffic via the second layer 2 interface based on detecting activation of the second layer 2 interface, while permitting transfer of layer 2 network traffic via the second layer 2 interface, wherein the layer 3 traffic is traffic routed between virtual local area networks, VLANs, and wherein the layer 2 traffic is traffic bridged within a VLAN; perform duplicate address detection, in association with the second layer 2 interface, for a layer 3 network address assigned to the IRB device by transmitting one or more duplicate address detection messages via the second layer 2 interface; determine whether the layer 3 network address is a duplicate network address based on performing the duplicate address detection, where the one or more processors, when determining whether the layer 3 network address is a duplicate network address, are to: determine whether the layer 3 network address is the same as another layer 3 network address of a set of layer 3 network addresses assigned to a set of host devices in communication with the IRB device via the second layer 2 interface; and selectively maintain or deactivate the filter based on determining whether the layer 3 network address is a duplicate network address. one or more processors to: activate a layer 3 interface of the IRB device based on activation of a first layer 2 interface associated with the layer 3 interface; detect activation of a second layer 2 interface, associated with the layer 3 interface, after activating the layer 3 interface; activate a filter to prevent transfer of layer 3 network traffic via the second layer 2 interface based on detecting activation of the second layer 2 interface, while permitting transfer of layer 2 network traffic via the second layer 2 interface, wherein the layer 3 traffic is traffic routed between virtual local area networks, VLANs, and wherein the layer 2 traffic is traffic bridged activate a layer 3 interface of the IRB device based on activation of a first layer 2 interface associated with the layer 3 interface; detect activation of a second layer 2 interface, associated with the layer 3 interface, after activating the layer 3 interface; activate a filter to prevent transfer of layer 3 network traffic via the second layer 2 interface based on detecting activation of the second layer 2 interface, while permitting transfer of layer 2 network traffic via the second layer 2 interface, wherein the layer 3 traffic is traffic routed between virtual local area networks, VLANs, and wherein the layer 2 traffic is traffic bridged within a VLAN; perform duplicate address detection, in association with the second layer 2 interface, for a layer 3 network address assigned to the IRB device by transmitting one or more duplicate address detection messages via the second layer 2 interface; determine whether the layer 3 network address is a duplicate network address based on performing the duplicate address detection, where the one or more processors, when determining whether the layer 3 network address is a duplicate network address, are to: determine whether the layer 3 network address is the same as another layer 3 network address of a set of layer 3 network addresses assigned to a set of host devices in communication with the IRB device via the second layer 2 interface; and selectively maintain or deactivate the filter based on determining whether the layer 3 network address is a duplicate network address. perform duplicate address detection, in association with the second layer 2 interface, for a layer 3 network address assigned to the IRB device by transmitting one or more duplicate address detection messages via the second layer 2 interface; determine whether the layer 3 network address is a duplicate network address based on performing the duplicate address detection, where the one or more processors, when determining whether the layer 3 network address is a duplicate network address, are to: determine whether the layer 3 network address is the same as another layer 3 network address of a set of layer 3 network addresses assigned to a set of host devices in communication with the IRB device via the second layer 2 interface; and selectively maintain or deactivate the filter based on determining whether the layer 3 network address is a duplicate network address.