3Com Switch 4800G 24-Port Configuration Manual page 146

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp

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ONFIGURATION

# 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

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

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Troubleshooting