3-2
Value Description
vtp
Enable/Disable BPDU tunnel for VLAN trunk
protocol (VTP).
udld
Enable/Disable BPDU tunnel for uni-directional
link direction (UDLD).
all: Disables BPDU tunnel for all protocol packets.
Description
Use the bpdu-tunnel command to enable BPDU tunnel on a port, so that packets of the specified
protocol will be transparently transmitted through the BPDU tunnel on the port.
Use the undo bpdu-tunnel command to disable BPDU tunnel on a port.
By default, BPDU tunnel is disabled on a port.
After you enable a port to transmit packets of a specified protocol type through the BPDU tunnel, when
the port receives such a packet, it will use the specified private multicast MAC address to replace the
original destination MAC address of the packet before sending it. As a result, the packet will not be
recognized as a protocol packet by other devices in the operator network during transmission. In this
way, transparent transmission is implemented.
You can use the bpdu-tunnel tunnel-dmac command to change the destination MAC addresses of
protocol packets to a specified multicast MAC address.
z If this command is enabled on a port for a specific protocol, the specific protocol cannot be enabled
on the port. For example, if you have configured the bpdu-tunnel lacp command, the lacp enable
command cannot be enabled on the port.
z The commands configured for service provider’s devices at both ends of a BPDU tunnel must be
consistent. Otherwise, BPDU packets of the customer network cannot be transparently transmitted
properly.
Examples
# Enable BPDU tunnel for packets of LACP.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] bpdu-tunnel lacp
bpdu-tunnel tunnel-dmac
Syntax
bpdu-tunnel tunnel-dmac mac-address
undo bpdu-tunnel tunnel-dmac
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