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default multicast MAC address) for example. In the service provider network, the modified BPDU
is forwarded as a data packet in the VLAN assigned to User A.
2.
At the egress of the service provider network, PE 2 recognizes the BPDU with the destination MAC
address 0x010F-E200-0003, restores its original destination MAC address 0x0180-C200-0000,
and then sends the BPDU to CE 2.
NOTE:
Make sure, through configuration, that the VLAN tags carried in BPDUs are neither changed nor removed
during the transparent transmission in the service provider network; otherwise, the routers in the service
provider network will fail to transparently transmit the customer network BPDUs correctly.
Configuring BPDU tunneling
Configuration prerequisites
•
Before configuring BPDU tunneling for STP, enable STP in the customer network first.
•
Before enabling BPDU tunneling for STP on a port, disable STP on the port first.
•
Assign the port on which you want to enable BPDU tunneling on the PE router and the connected
port on the CE router to the same VLAN.
•
Configure ports connecting routers in the service provider network as trunk ports allowing packets
of any VLAN to pass through.
Enabling BPDU tunneling for a protocol
This section describes how to enable BPDU tunneling for STP. You can enable BPDU tunneling for GVRP
in a similar way.
To enable BPDU tunneling for STP:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view or
port group view.
•
Enter Layer 2 Ethernet interface
view
:
interface
interface-type
interface-number
•
Enter Layer 2 aggregate interface
view
:
interface bridge-aggregation
interface-number
•
Enter port group view
:
port-group manual
port-group-name
Use any command.
Settings made in Layer 2
Ethernet/aggregate interface view
take effect only on the current port.
Settings made in port group view
take effect on all ports in the port
group.
3.
Disable STP.
stp disable
N/A
4.
Enable BPDU tunneling
for STP.
bpdu-tunnel dot1q
stp
By default, BPDU tunneling is
disabled for STP.
