Configuring Vlan Interface Basic Attributes - 3Com MSR 50 Series Configuration Manual

490 C 24: VLAN C
HAPTER
Configuring VLAN
Interface Basic
Attributes
ONFIGURATION
To do...
Enter VLAN view
Specify a descriptive
string for the VLAN
Hosts of different VLANs cannot communicate directly. That is, routers or Layer 3
switches are needed for packets to travel across different VLANs. VLAN interfaces
are used to forward VLAN packets on Layer 3.
VLAN interfaces are Layer 3 virtual interfaces (which do not exist physically on
devices) used for Layer 3 interoperability between different VLANs. Each VLAN can
have one VLAN interface. Packets of a VLAN can be forwarded on network layer
through the corresponding VLAN interface. As each VLAN forms a broadcast
domain, a VLAN can be an IP network segment and the VLAN interface can be the
gateway to enable IP address-based Layer 3 forwarding.
Follow the following steps to configure VLAN interface basic attributes:
To do...
Enter system view
Create a VLAN interface or
enter VLAN interface view
Configure an IP address for
the VLAN interface
Specify the descriptive
character string for the
VLAN interface
Bring up the VLAN
interface
Use the command...
vlan vlan-id
description text
Use the command...
system-view
interface vlan-interface
vlan-interface-id
ip address ip-address
{ mask | mask-length }
[ sub ]
description text
undo shutdown
Remarks
Required
The VLAN must be created first before
entering its view; otherwise, using the
command creates a VLAN and enters its
view.
By default, only one default VLAN (that
is, VLAN 1) exists in the system.
Optional
VLAN ID used by default, for example,
"VLAN 0001"
Remarks
-
Required
This command leads you to VLAN
interface view if the VLAN interface
already exists.
Optional
Not configured by default
Optional
VLAN interface name used by
default
Optional
By default, a VLAN interface is up.
The state of a VLAN interface also
depends on the states of the ports
in the VLAN. If all the ports in the
VLAN are down, the VLAN interface
is down; if one or more ports in the
VLAN are up, the VLAN interface is
up.
If a VLAN interface is manually shut
down, the VLAN interface is always
down regardless of the states of
ports in the VLAN.