3Com Switch 4800G 24-Port - Configuring Basic VLAN Attributes; Basic VLAN Interface Configuration

86 CHAPTER 9: VLAN CONFIGURATION
Configuring Basic
VLAN Attributes
Follow these steps to configure basic VLAN attributes:
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■ As the default VLAN, VLAN 1 cannot be created or removed.
■ You cannot manually create or remove reserved VLANs, which are reserved for
specific functions.
■ Dynamic VLANs cannot be removed using the undo vlan command.
■ If a VLAN has a QoS policy configured, the VLAN cannot be removed.
■ If a VLAN is configured as a remote-probe VLAN for remote port mirroring, it
cannot be removed using the undo vlan command unless its remote-probe
VLAN configuration is removed.
Basic VLAN Interface
Configuration
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 these steps to configure VLAN interface basic attributes:
To do… Use the command… Remarks
Enter system view system-view -
Create VLANs vlan { vlan-id1 [ to vlan-id2 ] |
all }
Optional
Using this command can
create multiple VLANs in a
bulk.
Enter VLAN view vlan vlan-id Required
If the specified VLAN does not
exist, the command creates
the VLAN and then enters its
view.
By default, only the default
VLAN (that is, VLAN 1) exists
in the system.
Specify a descriptive string for
the VLAN
description text Optional
VLAN ID used by default, for
example, “VLAN 0001"
To do… Use the command… Remarks
Enter system view system-view -
Create a VLAN interface or
enter VLAN interface view
interface Vlan-interface
vlan-interface-id
Required
This command leads you to
VLAN interface view if the
VLAN interface already exists.