3Com 4510G Configuration Manual page 192

All ports used to connect devices in the service provider network 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 11-4 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 GigabitEthernet 1/0/1 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 GigabitEthernet 1/0/1, 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 GigabitEthernet 1/0/2 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 GigabitEthernet 1/0/2, 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
11-7
carried in BPDUs be