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Configuring basic settings of a VLAN interface
Hosts of different VLANs use VLAN interfaces to communicate at Layer 3. VLAN interfaces are
virtual interfaces that do not exist as physical entities on devices. For each VLAN, you can create
one VLAN interface and assign an IP address to it. The VLAN interface acts as the gateway of the
VLAN to forward packets destined for another IP subnet.
When you configure a VLAN interface, follow these restrictions and guidelines:
•
Before you create a VLAN interface for a VLAN, create the VLAN first.
•
You cannot create a VLAN interface for a sub-VLAN. For more information about sub-VLANs,
see "
."
•
You cannot create VLAN interfaces for secondary VLANs that have the following
characteristics:
{
Associated with the same primary VLAN.
{
Enabled with Layer 3 communication in VLAN interface view of the primary VLAN interface.
For more information about secondary VLANs, see "
."
To configure basic settings of a VLAN interface:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Create a VLAN interface
and enter VLAN interface
view.
interface vlan-interface
vlan-interface-id
If the VLAN interface already exists,
you enter its view directly.
By default, no VLAN interface is
created.
3.
Assign an IP address to
the VLAN interface.
ip
address
ip-address
{
mask
|
mask-length
} [
sub
]
By default, no IP address is assigned to
any VLAN interface.
4.
Configure the description
of the VLAN interface.
description text
The default setting is the VLAN
interface name. For example,
Vlan-interface1 Interface
.
5.
(Optional.) Specify a
member device for
forwarding the traffic on
the current VLAN
interface.
service slot
slot-number
By default, no member devices are
specified.
6.
Configure the MTU for the
VLAN interface.
mtu size
The default setting is 1500 bytes.
7.
Configure the expected
bandwidth of the interface.
bandwidth
bandwidth-value
By default, the expected bandwidth (in
kbps) is the interface baud rate divided
by 1000.
8.
(Optional.) Restore the
default settings for the
VLAN interface.
default
N/A
9.
(Optional.) Bring up the
VLAN interface.
undo shutdown
By default, a VLAN interface is not
manually shut down. The VLAN
interface is up if one or more ports in
the VLAN is up, and goes down if all
ports in the VLAN go down.