VirtuaL area network (VLAN)
- 1. GOVERNMENT ENGINEERING COLLEGE,BHARUCH ELECTRONICS AND COMMUNICATION DEPARTMENT Presentation Topic: Name(enrollment no): Virtual LAN Vipul Sharma 170140111098
- 2. What is LAN?? – A Local Area Network (LAN) was originally defined as a network of computers located within the same area – Local Area Networks are defined as a single broadcast domain. This means that if a user broadcasts information on his/her LAN, the broadcast will be received by every other user on the LAN. – Broadcasts are prevented from leaving a LAN by using a router. The disadvantage of this method is routers usually take more time to process incoming data compared to a bridge or a switch.
- 3. What is Virtual LAN?? – Virtual Local area network is termed as VLAN. – VLANs provide segmentation based on broadcast domains. – VLANs logically segment switched networks based on the functions, project teams, or applications of the organization regardless of the physical location or connections to the network. – All workstations and servers used by a particular workgroup share the same VLAN, regardless of the physical connection or location.
- 4. More About VLAN – The total stations(computers) are divided into logical groups instead ofphysical segments. – It is possible to move one station from one group to any other group without changing the physical connections(configuration) because membership of group is defined by software and not by hardware. – VLAN is extremely handy where the connections are spread over multiple buildings or departments.
- 5. LAN and VLAN Conventional LAN connection VLAN Configuration
- 6. Types of VLAN – Port Based: Most common configuration method. Port assign individually, in group, in rows, or across 2 or more switches. Simple to use. – MAC Address: Rarely implemented today. Each address must be entered into the switch and configured individually. User find it useful. – Protocol Base: Configured like MAC address, but instead uses a logical or IP address. No longer common because of DHCP.
- 7. VLAN Membership Static Membership – Static VLANs are also referred to as port-based VLANs. Static VLAN assignments are created by assigning ports to a VLAN. – As a device enters the network, the device automatically assumes the VLAN of the port. – If the user changes ports and needs access to the same VLAN, the network administrator must manually make a port-to-VLAN assignment for the new connection. Dynamic Membership – Dynamic VLANs are created using software or by protocol. – With a VLAN Management Policy Server (VMPS), an administrator can assign switch ports to VLANs dynamically based on information of the source MAC address of the device connected to the port or the username used to log onto that device. – As a device enters the network, the switch queries a database for the VLAN membership of the port that device is connected to.
- 8. Protocols and Designs. – IEEE 802.1Q – The protocol most commonly used today to support VLANs is IEEE 802.1Q. – It is open standard i.e. it is available for all to use. – It works with ethernet only. – Only 4 byte tag will be added to the original frame – Cisco Inter-Switch Link – It is CISCO proprietary. – This protocol used to interconnect switches and maintain VLAN information as traffic travels between switches on trunk links. – It adds 30 bytes of tags. – ISL is available only on some Cisco equipment.
- 9. Benefits of VLAN – The key benefit of VLANs is that they permit the network administrator to organize the LAN logically instead of physically. – This means that an administrator is able to do all of the following: 1. Easily move workstations on the LAN. 2. Easily add workstations to the LAN. 3. Easily change the LAN configuration. 4. Easily control network traffic. Improve security