Do network bridges on AR series routers transparently transmit BPDUs

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

Other related questions:
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.

Do network bridges transparently transmit packets with VLAN tags
Yes, network bridges transparently transmit packets with virtual local area network (VLAN) tags. VLANIF interfaces, however, do not transparently transmit packets with VLAN tags. Using sub-interfaces to transparently transmit packets with VLAN tags is not recommended.

Can BPDUs be transparently transmitted on a device
After the bpdu enable command is used on an interface, the interface sends received BPDUs to the CPU for processing. The local device determines whether to process BPDUs of a protocol depending on whether the protocol is enabled. For example, whether STP BPDUSs on an interface are sent to the CPU depends on whether STP has been enabled on the interface using the stp enable command. After the bpdu disable command is used on an interface, BPDUs received on this interface are discarded by the chip. To transparently transmit BPDUs on a device, enable Layer 2 protocol transparent transmission on the device interfaces. In V100R005 and later versions, run the l2protocol-tunnel all enable command on an interface to enable Layer 2 protocol transparent transmission. To ensure successful forwarding of packets, configure the default VLAN on the inbound and outbound interfaces of all devices on the forwarding path.

How MSTP BPDUs are transparently transmitted on a VPLS network
For S series switches (except the S1700), MSTP BPDUs are transparently transmitted on a VPLS network using the following methods: 1. Transmitting untagged BPDUs transparently If BPDUs from a Layer 2 network do not carry tags, you need to run the port default vlan vlan-id and stp disable commands on the user-side interface of PE1. After receiving an untagged BPDU from the Layer 2 network, PE1 adds a specific tag to the BPDU and then transparently transmits the BPDU to PE2 over the VPLS network. After receiving the BPDU, PE2 removes the tag and then sends the BPDU to a specific attached user. 2. Transmitting tagged BPDUs transparently If BPDUs from a Layer 2 network carry tags, you need to run the stp bpdu vlan vlan-id command on the user-side interfaces of devices on the Layer 2 network, and run the port trunk allow-pass vlan command on the user-side interface of PE1. After receiving a tagged BPDU from the Layer 2 network, PE1 transparently transmits the BPDU to PE2 over the VPLS network. After receiving the BPDU, PE2 directly sends the BPDU to a specific attached user.

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