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TPID Adjusting Configuration
Configuration Prerequisites
z To change the global TPID value 0x8100, you need to specify a port on the device as a VLAN VPN
uplink port. Before the configuration, make sure that VLAN VPN is disabled on the port.
z For proper packet transmission, confirm the TPID value of the peer device in the public network
before adjusting the TPID value.
Configuration Procedure
Follow these steps to adjust the TPID value for VLAN-VPN packets on a port:
To do… Use the command… Remarks
Enter system view
system-view
—
Set the TPID value globally
vlan-vpn tpid value
Required
Do not set the TPID value to any of the
protocol type values listed in
Table 1-1.
The default TPID value used on the
device is 0x8100.
Enter Ethernet port view
interface interface-type
interface-number
—
Set the port to be a VLAN-VPN
uplink port
vlan-vpn uplink enable
Optional
By default, the VLAN-VPN uplink
function is disabled.
z A port cannot be configured as both a VLAN VPN port and a VLAN VPN uplink port at the same
time.
z With the TPID being 0x8100, every port can be configured as a VLAN VPN uplink port. However, if
the TPID value is not the default value, you need to use the vlan-vpn uplink enable command to
specify a VLAN VPN uplink port.
z A VLAN VPN uplink port does not remove the outer VLAN tags of packets to be sent through it, so
a VLAN VPN uplink port must be configured as a trunk port or hybrid port and configured to keep
the outer VLAN when sending packets of the outer VLAN.
Displaying and Maintaining VLAN-VPN
To do… Use the command… Remarks
Display the VLAN-VPN
configurations of all the ports
display port vlan-vpn
Available in any view