Vlan-Vpn Tpid - 3Com 8807 Command Reference Manual

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HAPTER IN
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vlan-vpn tpid

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ONFIGURATION OMMANDS
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
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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
Syntax
vlan-vpn tpid value
undo vlan-vpn tpid
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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.
Table 155 Common protocol type values of an Ethernet frame
Protocol type
ARP
IP
MPLS
IPX
IS-IS
Value
0x0806
0x0800
0x8847/0x8848
0x8137
0x8000