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

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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.

Other related questions:
What are the differences between a bridge on an AR router and a VLAN
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.

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.

Do network bridges on AR series routers transparently transmit BPDUs
No. Network bridges on all models of AR series routers do not transparently transmit BPDUs.

What are differences between the multicast and unicast transmission modes for S series switches
Differences between the multicast and unicast transmission modes - In unicast transmission mode, a source sends an independent data packet to each host that requires data. In this mode, the amount of data transmitted on a network is proportional to the number of users who require the data. If a large number of users require the same data, the source must send many copies of the data to these users, consuming high bandwidth on the source and network. - Multicast is a point-to-multipoint (P2MP) data transmission mode. The source sends only one copy of data, and all the hosts that require the data can receive the same data. Other hosts on the network cannot receive the data. In multicast mode, data starts to be copied and distributed on the network node as far from the source as possible. Therefore, the amount of data and network resource consumption will not increase greatly when the number of receivers increases. Disadvantages of multicast transmission - Compared with the unicast mode, the multicast mode has no error correction mechanism, but some fault tolerance mechanisms can be adopted. - Although multicast transmission is supported by existing networks, features such as customer authentication and QoS are not well supported.

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