STP BPDU passing over trunk link CE6800

Created: Oct 12, 2018 20:42:40 229 0 0 1

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Issue Description

Customer using CloudEngine 6800 with next configuration on different ports facing clients:

interface 10GE 1/0/1

port link-type trunk

port trunk pvid vlan 1234

port trunk allow-pass vlan 1 2000 2001 2002 2003

Question: deleting VLAN 1 from allowed VLANs on the trunk link, will the CloudEngine process the received BPDUs or discard them?

Solution

Answer: BPDUs are sent from the switch with source MAC address of the switch
towards a multicast destination (the CE 6800 listening to this address). By default, they do not contain
any VLAN tag, so they are not influenced by the VLAN configurations on the interface.

Deleting VLAN 1 in the allowed VLANs from the trunk using command “[Huawei-GigabitEthernet0/0/1]undo port trunk allow-pass vlan 1” will not make the BPDU packets to be dropped.

x
convention：

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STP BPDU passing over trunk link CE6800

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