3Com 4500G Family Configuration Manual page 202

All ports that connect service provider devices and customer devices and those that interconnect
service provider devices are trunk ports and allow packets of any VLAN to pass through.
PVST is enabled for VLANs 1 through 4094 on User A's network. It is required that, after the
configuration, CE 1 and CE 2 implement consistent PVST calculation across the service provider
network, and
0x0100-0CCD-CDD0.
Figure 1-4 Network diagram for configuring BPDU tunneling for PVST
Configuration procedure
1) Configuration on PE 1
# Configure the destination multicast MAC address for BPDUs as 0x0100-0CCD-CDD0.
<PE1> system-view
[PE1] bpdu-tunnel tunnel-dmac 0100-0ccd-cdd0
# Configure GigabitEthernet1/0/1 as a trunk port and assign it to all VLANs.
[PE1] interface gigabitethernet 1/0/1
[PE1-GigabitEthernet1/0/1] port link-type trunk
[PE1-GigabitEthernet1/0/1] port trunk permit vlan all
# Disable STP on GigabitEthernet1/0/1, and then enable BPDU tunneling for STP and PVST on it.
[PE1-GigabitEthernet1/0/1] undo stp enable
[PE1-GigabitEthernet1/0/1] bpdu-tunnel dot1q stp
[PE1-GigabitEthernet1/0/1] bpdu-tunnel dot1q pvst
2) Configuration on PE 2
# Configure the destination multicast MAC address for BPDUs as 0x0100-0CCD-CDD0.
<PE2> system-view
[PE2] bpdu-tunnel tunnel-dmac 0100-0ccd-cdd0
# Configure GigabitEthernet1/0/2 as a trunk port and assign it to all VLANs.
[PE2] interface gigabitethernet 1/0/2
[PE2-GigabitEthernet1/0/2] port link-type trunk
[PE2-GigabitEthernet1/0/2] port trunk permit vlan all
# Disable STP on GigabitEthernet1/0/2, and then enable BPDU tunneling for STP and PVST on it.
[PE2-GigabitEthernet1/0/2] undo stp enable
[PE2-GigabitEthernet1/0/2] bpdu-tunnel dot1q stp
[PE2-GigabitEthernet1/0/2] bpdu-tunnel dot1q pvst
that the destination multicast MAC address
1-7
carried in BPDUs be