Inner-To-Outer Tag Priority Replicating And Mapping; Transparent Igmp Message Transmission On A Vlan-Vpn Port; Vlan-Vpn Configuration - 3Com E4500-24 Cli Configuration Manual

frame as needed. When doing that, you should set the same TPID on both the customer-side port and
the service provider-side port.
The TPID in an Ethernet frame has the same position with the protocol type field in a frame without a
VLAN tag. To avoid problems in packet forwarding and handling, you cannot set the TPID value to any
of the values in the table below.
Table 1-1 Commonly used protocol type values in Ethernet frames
ARP
IP
MPLS
IPX
IS-IS
LACP
802.1x

Inner-to-Outer Tag Priority Replicating and Mapping

As shown in Figure
is in the range 0 to 7. By configuring inner-to-outer tag priority replicating or mapping for a
VLAN-VPN-enabled port, you can replicate the inner tag priority to the outer tag or assign outer tags of
different priorities to packets according to their inner tag priorities.
Refer to QoS part for information about priority.

Transparent IGMP Message Transmission on a VLAN-VPN Port

For detailed information about IGMP messages and how a switch processes IGMP messages of
different types, refer to the Multicast module in this manual.
For a VLAN-VPN-disabled port, the switch transparently transmits an IGMP message received on the
port within the VLAN that the IGMP message belongs to. For the switch to transparently transmit an
IGMP message received on a VLAN-VPN port in the outer VLAN, you must enable transparent IGMP
message transmission on the port.

VLAN-VPN Configuration

VLAN-VPN Configuration Task List
Complete the following tasks to configure VLAN-VPN:
Protocol type
1-3, the user priority field is the 802.1p priority of the tag. The value of this 3-bit field
0x0806
0x0800
0x8847/0x8848
0x8137
0x8000
0x8809
0x888E
1-3
Value