117
Step Command
Remarks
8.
(Optional.) Bring up the
VLAN interface.
undo shutdown
By default, a VLAN interface is not
manually shut down. The following
guidelines apply to the VLAN interface
that is in default state:
•
The VLAN interface is down if all
ports in the VLAN are down.
•
The VLAN interface is up if one or
more ports in the VLAN are up.
Configuring port-based VLANs
Introduction
Port-based VLANs group VLAN members by port. A port forwards packets from a VLAN only after it
is assigned to the VLAN.
Port link type
You can configure the link type of a port as access, trunk, or hybrid. The link types use the following
VLAN tag handling methods:
•
Access
—An access port can forward packets only from one VLAN and send these packets
untagged. An access port is typically used in the following conditions:
{
Connecting to a terminal device that does not support VLAN packets.
{
In scenarios that do not distinguish VLANs.
•
Trunk
—A trunk port can forward packets from multiple VLANs. Except packets from the port
VLAN ID (PVID), packets sent out of a trunk port are VLAN-tagged. Ports connecting network
devices are typically configured as trunk ports.
•
Hybrid
—A hybrid port can forward packets from multiple VLANs. The tagging status of the
packets forwarded by a hybrid port depends on the port configuration. In one-to-two VLAN
mapping, hybrid ports are used to remove SVLAN tags from downlink traffic. For more
information about one-to-two VLAN mapping, see "
."
PVID
The PVID identifies the port VLAN of a port.
When you configure the PVID on a port, follow these restrictions and guidelines:
•
An access port can join only one VLAN. The VLAN to which the access port belongs is the PVID
of the port.
•
A trunk or hybrid port supports multiple VLANs and the PVID configuration.
•
When you use the
undo vlan
command to delete the PVID of a port, either of the following
events occurs depending on the port link type:
{
For an access port, the PVID of the port changes to VLAN 1.
{
For a hybrid or trunk port, the PVID setting of the port does not change.
You can use a nonexistent VLAN as the PVID for a hybrid or trunk port, but not for an access
port.
•
As a best practice, set the same PVID for a local port and its peer.
•
To prevent a port from dropping untagged packets
or PVID-tagged packets, assign the port to
its PVID.
Summary of Contents for H3C S7500E-X
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