3Com 8807 - Vlan-Vpn Tpid

1068 CHAPTER 65: QINQ CONFIGURATION COMMANDS
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CAUTION:
■ VLAN VPN cannot be enabled if the port has any of GVRP, STP, and 802.1x
protocols enabled.
■ 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.
■ 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.
■ 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.
Example
# Enable the VLAN VPN feature on the Ethernet2/1/1 port.
[3Com-Ethernet2/1/1] vlan-vpn enable
vlan-vpn tpid Syntax
vlan-vpn tpid value
undo vlan-vpn tpid
View
System view
Parameter
value: TPID value to be set (in hexadecimal format). This argument ranges from 1
to 0xFFFF.
Description
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.
Tabl e 155 Common protocol type values of an Ethernet frame
Protocol type Value
ARP 0x0806
IP 0x0800
MPLS 0x8847/0x8848
IPX 0x8137
IS-IS 0x8000