How to enable a switch to transparently transmit BPDUs that are discarded by default

14

You can enable a switch to transparently transmit BPDUs in the following modes:

1. Run the bpdu bridge enable command to enable the port bridge function. Then the switch can transparently transmit all BPDUs.

2. Globally specify the group MAC address of BPDU for the inbound and outbound ports of two edge switches on the network, and enable the L2PT transparent transmission function of the protocol for the ports.

Incoming BPDUs are replaced with the group MAC address, converted to data packets, and forwarded in the VLAN. Configure the L2PT function in the outbound port to replace the group MAC address with the BPDU MAC address.

Other related questions:
How to configure BPDU tunneling on S series switches to transparently transmit BPDUs
To configure S series (except the S1700) and E series switches to transparently transmit BPDUs, perform the following operations: 1. Configure interface-based Layer 2 protocol transparent transmission. (1) Run the l2protocol-tunnel group-mac command in the system view to replace the multicast destination MAC address of Layer 2 protocol packets with a specified multicast MAC address. (2) Run the port default vlan command on the inbound and outbound interfaces to transparently transmit untagged BPDUs. (3) Run the l2protocol-tunnel { all | protocol-type } enable command on the inbound and outbound interfaces to enable interface-based Layer 2 protocol transparent transmission. 2. Configure VLAN-based Layer 2 protocol transparent transmission. (1) Run the l2protocol-tunnel group-mac command in the system view to replace the multicast destination MAC address of Layer 2 protocol packets with a specified multicast MAC address. (2) Run the port link-type hybrid and port hybrid tagged vlan commands on the inbound and outbound interfaces to transparently transmit tagged BPDUs. (3) Run the l2protocol-tunnel { all | protocol-type } vlan command on the inbound and outbound interfaces to enable VLAN-based Layer 2 protocol transparent transmission.

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 can I configure BPDU tunnel to transparently transmit BPDUs
To transparently transmit untagged BPDUs, run the port default vlan command on the inbound and outbound interfaces of the BPDUs. To transparently transmit tagged BPDUs, run the port default vlan command on the outbound interface of the BPDUs.

Do the S2700&S3700&S5700&S6700 switches transparently transmit BPDUs by default
By default, the S2700&S3700&S5700&S6700 switches do not transparently transmit Bridge Protocol Data Unit (BPDUs).

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top