H3C Technologies H3C S10500 Series Switches - Manual (Page 127)

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Configuring basic settings of a VLAN interface
VLAN interface overview
For hosts of different VLANs to communicate, you must use a router or Layer 3 switch to perform Layer 3
forwarding. You use VLAN interfaces to achieve this.
VLAN interfaces are virtual interfaces used for Layer 3 communication between different VLANs. They do
not exist as physical entities on devices. For each VLAN, you can create one VLAN interface. You can
assign the VLAN interface an IP address and specify it as the gateway of the VLAN to forward traffic
destined for an IP subnet different from that of the VLAN.
Configuration procedure
Follow these steps to configure basic settings of a VLAN interface:
To do… Use the command… Remarks
Enter system view system-view —
Create a VLAN interface and
enter VLAN interface view interface vlan-interface
vlan-interface-id
Required
If the VLAN interface already exists, you
enter its view directly.
Assign an IP address to the
VLAN interface
ip address ip-address
{ mask | mask-length }
[ sub ]
Optional
By default, no IP address is assigned to any
VLAN interface.
Configure the description of the
VLAN interface
description text
Optional
By default, the description of a VLAN is the
VLAN interface name. For example,
Vlan-interface1 Interface.
Set the MTU for the VLAN
interface
mtu size
Optional
By default, the MTU is 1500 bytes.
Restore the default settings for
the VLAN interface
default Optional
Shut down the VLAN interface shutdown
Optional
By default, a VLAN interface is in the up
state. 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.
A VLAN interface shut down with the
shutdown command is in the DOWN
(Administratively) state until you bring it up,
regardless of how the state of the ports in the
VLAN changes.
NOTE:
Before you create a VLAN interface for a VLAN, create the VLAN.