3com 8807 Reference Guide

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VLAN VPN cannot be enabled if the port has any of GVRP, STP, and 802.1x 
protocols enabled.

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VLAN VPN cannot be enabled on a port if the VLAN which the port belongs to 
has IGMP Snooping enabled or its VLAN interface has IGMP enabled. Similarly, 
if a port is VLAN VPN-enabled, you cannot enable IGMP Snooping in the VLAN 
to which the port belongs or enable IGMP on the VLAN interface of the VLAN.

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If you want to add VLAN VPN-enabled ports to a VLAN, make sure the VLAN is 
not IGMP Snooping-enabled, and the VLAN interface is not IGMP-enabled.

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If you have enabled VLAN VPN feature for the ports in the VLAN, the VLAN 
cannot be removed.

By default, the VLAN VPN feature is disabled on a port or PVC.

# Enable the VLAN VPN feature on the Ethernet2/1/1 port.

[3Com-Ethernet2/1/1] vlan-vpn enable 

vlan-vpn tpid value

System view

value: TPID value to be set (in hexadecimal format). This argument ranges from 1 
to 0xFFFF.

Use the vlan-vpn tpid command to set the TPID value of the VLAN-VPN uplink 
ports.

Use the undo vlan-vpn tpid command to restore the default TPID value (0x8100) 
for VLAN-VPN uplink ports.

Do not set the TPID value to a value that may cause conflicts (such as the known 
protocol type value 0x0806, which is that of ARP packets). Otherwise, the packets 
may be discarded.

Table 155   Common protocol type values of an Ethernet frame

ARP 

0x0806 

IP 

0x0800 

MPLS 

0x8847/0x8848 

IPX 

0x8137 

IS-IS 

0x8000