3Com WX3000 operation manual Displaying and Maintaining VLAN-VPN, Tpid Adjusting Configuration

TPID Adjusting Configuration

Configuration Prerequisites

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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.

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	—
		Required
		Do not set the TPID value to any of the
Set the TPID value globally	vlan-vpn tpid value	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		Optional
	vlan-vpn uplink enable	By default, the VLAN-VPN uplink
uplink port		function is disabled.

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A port cannot be configured as both a VLAN VPN port and a VLAN VPN uplink port at the same time.

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.

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	display port vlan-vpn	Available in any view
configurations of all the ports

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