A VLAN (virtual local area network) allows multiplexing to a lot of IP or MPLS and/or PPPOE lines or interfaces on a separate physical port of Ethernet. The multiplexing is achieved by sub interfaces of VLAN. Standards of 802.1q-1998 IEEE is supported by Ethernet interfaces for the Networks of Metropolitan and Local Area: i.e. Virtual Bridged Local Area Networks that the transmitter or router works or uses like its regular and consistent format or design for tagging of frame.
The frame layout of Ethernet V2 permits multiplexing of dissimilar protocols on a separate tangible link. 802.1q IEEE harmonious expands the frame format through affixing a tag that includes an ID of VLAN. This characteristic permits multiplexing of dissimilar channels of VLAN on the physical connection; different channels are multiplexed by every channel.
Creating a VLAN Main Interface Ethernet interface must be configured first to apply VLANs for encapsulation of VLAN. This designs the VLAN main interface. Such as:
- Identify a port of a Gigabit Ethernet or a Fast Ethernet.
host1(config)#interface fastEthernet 4/0Identify VLAN as the summing up process.host1(config-if)#encapsulation vlan
The router designs main interface of VLAN.
- Initiate a sub interface of VLAN by including a sub interface figure to the line or interface detection command.
host1(config-if)#interface fastEthernet 4/0.3
VLAN ID is assigned for the sub interface.
host1(config-if)#vlan id 201
A mask and IP address is allotted.
host1(config-if)#ip address 220.127.116.11 255.255.255.0
Further VLAN sub interfaces are configured by implementing 3 through 5 steps (optional).
- (Optional) Configure additional VLAN subinterfaces by completing Steps 3 through 5.
Configurations of Common VLAN
Interfaces of Ethernet maintain also PPPOE, MPLS, and IP, or PPPOE andIP together on every VLAN. Further to a main interface level of VLAN, there is a sub interface level of VLAN to differentiate the VLAN.
This part explains the process of creating the next configurations of common VLAN; through which user can establish ob both interface of Gigabit Ethernet and Fast Ethernet.
- PPPOE on VLAN
- IP on VLAN
- MPLS on VLAN
- PPPOE on VLAN and IP on VLAN
Communication of devices on different VLAN
The communication of devices or components on dissimilar VLAN occurs through a router or transmitter or a Layer 3 switch. Because the every VLAN has its subnet, a transmitter or Layer 3 switch is necessary to be utilized to route within the subnets.
When the link is created within two switches or a transmitter and a switch that transmits the traffic of multiple VLAN, the port is called trunk port.
Offer of VLAN
VLAN presents great functioning for average and large LAN’s as they regulate broadcasts. Since the number of traffic and the amount of components of devices extend, so the packets of broadcast amount does. Broadcast can be contained by user through using VLANs.
Security is also provided by VLANs because users are basically locating one set of devices on their network, in single VLAN.