3Com 7757 Configuration Manual page 279

BPDU Tunnel Configuration Example 279
# Disable STP on port Ethernet1/0/2 and then enable the VLAN-VPN function on it.
[SW7750] interface Ethernet 1/0/2
[SW7750-Ethernet1/0/2] port access vlan 10
[SW7750-Ethernet1/0/2] stp disable
[SW7750-Ethernet1/0/2] vlan-vpn enable
[SW7750-Ethernet1/0/2] quit
# Configure port Ethernet1/0/1 as a trunk port.
[SW7750] interface Ethernet 1/0/1
[SW7750-Ethernet1/0/1] port link-type trunk
# Add the trunk port to all VLANs.
[SW7750-Ethernet1/0/1] port trunk permit vlan all