3Com 8807 Configuration Manual page 95

Setting the Default
VLAN ID for the Ethernet
Setting the VLAN VPN
Feature on a Port
Note that the access port shall be added to an existing VLAN other than VLAN 1.
The VLAN to which Hybrid port is added must have been existed.
After adding the Ethernet port to specified VLANs, the local port can forward
packets of these VLANs. The hybrid and trunk ports can be added to multiple
VLANs, thereby implementing the VLAN intercommunication between peers. For
the hybrid port, you can configure to tag some VLAN packets, based on which the
packets can be processed differently.
Since the access port can only be included in one VLAN only, its default VLAN is
the one to which it belongs. The hybrid port and the trunk port can be included in
Port several VLANs, it is necessary to configure the default VLAN ID. If the default VLAN
ID has been configured, the packets without VLAN Tag will be forwarded to the
port that belongs to the default VLAN. When sending the packets with VLAN Tag,
if the VLAN ID of the packet is identical to the default VLAN ID of the port, the
system will remove VLAN Tag before sending this packet.
Perform the following configuration in Ethernet port view.
Table 80 Setting the default VLAN ID for the Ethernet port
Operation
Set the default VLAN ID for the hybrid port
Set the default VLAN ID for the trunk port
Restore the default VLAN ID of the hybrid port
to the default value
Restore the default VLAN ID of the trunk port
to the default value
Note that: to guarantee the proper packet transmission, the default VLAN ID of
local hybrid port or Trunk port should be identical with that of the hybrid port or
Trunk port on the peer switch.
By default, the VLAN of hybrid port and trunk port is VLAN 1 and that of the
access port is the VLAN to which it belongs
A VLAN Tag consists of only 12 bits (defined by IEEE802.1Q), so Ethernet Switches
can support up to 4k VLANs. In networking, especially in MAN (metropolitan area
network), a large numbers of VLANs are required to segment users. In this case, 4k
VLANs are not enough.
The port VLAN VPN feature of the switch can provide duplex VLAN Tags to a
packet, namely, mark the packet with another VLAN Tag besides the original one,
thus to provide 4k x 4k VLANs to meet user's demands for VLANs. At the same
time, the port VLAN VPN feature provides the following functions: using the
original VLAN Tag to differentiate users and services, and using the new VLAN Tag
to load service and VPN users. These make VLAN configuration simple and
practicable. Through VLAN VPN configuration, Ethernet Switches can meet the
requirement in MAN.
If VLAN VPN is enabled on a port, every packet received on the port (no matter
whether the packet carries a VLAN Tag or not) will be given a new Tag that
specifies the default VLAN of this port. Thus, if the port receives a packet that
Setting the Interval of Performing Statistics on Ports
Command
port hybrid pvid vlan vlan-id
port trunk pvid vlan vlan-id
undo port hybrid pvid
undo port trunk pvid
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