What are the differences between a bridge on an AR router and a VLAN

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A bridge on an AR router can forward WAN packets in Layer 2. In addition, Layer-3 interfaces can be added into a bridge, which is different from a VLAN into which only Layer-2 interfaces can be added.

Other related questions:
What are the differences between network bridges and VLANs
Network bridges can implement packet forwarding at Layer 2 on the wide area network (WAN) side. Only Layer 2 interfaces can be added to virtual local area networks (VLANs). Only Layer 3 interfaces can be added to network bridges.

What are the differences between the MAC address of a bridge on an AR router and a normal MAC address
The MAC address of a bridge on an AR router equals to a normal MAC address. A bridge bridges complete Layer-2 Ethernet packets.

What is the difference between the BPDU packet transparent transmission modes of the bridges on AR routers in different forms

Difference between the BPDU packet transparent transmission modes of the bridges on AR routers in different forms:
The bridges on AR routers in all forms do not transparently transmit BPDU packets. Therefore, there is no difference.

Can a bridge transparently transmit packets carrying VLAN tags
A bridge on an AR router supports the transparently transmission of VLAN packets. However, a VLANIF interface does not support the transparently transmission of VLAN packets. It is not recommended that the transparent transmission of VLAN packets should be performed on sub-interfaces.

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