146 CHAPTER 15: BPDU TUNNELING CONFIGURATION
# Configure BPDU transparent transmission on GigabitEthernet 1/0/4.
[ProviderC-GigabitEthernet1/0/3] quit
[ProviderC] interface GigabitEthernet 1/0/4
[ProviderC-GigabitEthernet1/0/4] port access vlan 2
[ProviderC-GigabitEthernet1/0/4] stp disable
[ProviderC-GigabitEthernet1/0/4] undo ntdp enable
[ProviderC-GigabitEthernet1/0/4] bpdu-tunnel dot1q enable
[ProviderC-GigabitEthernet1/0/4] bpdu-tunnel dot1q stp
n
When STP works stably on the customer network, if Customer A acts as the root
bridge, the ports of Customer C and Customer D connected with Provider C can
receive BPDUs from Customer A. Since BPDU isolation is enabled on Customer B,
the port that connects Customer B to Provider B cannot receive BPDUs from
Customer A.
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