1. HELLO WORLD!!! Run Project 2: WELCOME Subject: Virtual LAN’s
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HELLO WORLD!!!
Run Project 2:
WELCOME
Subject: Virtual LAN’s
By: Michael Alford, RD Mira, Branden Terribile.
Enjoy!!!

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Run Project 2:
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Presentation Overview
Virtual LANs
History of VLANs
Why use VLANs
Setup
1 Switch = 2 VLANs
Configuring a VLAN-capable Switch
Trunking
Virtual Trunk Protocol
InterVLAN Routing

3. Virtual LAN’s
VLAN – collection of nodes grouped together in a single broadcast domain based on something other than physical location
LAN bridge
Filtering databases
IEEE 802.1Q Draft Standard
Today’s LANs are complex
Many networks have remote incoming connections, public Web or servers, wireless networks, as well as the basic string of connected switches
Leaving all of these different features on a single broadcast domain creates a tremendous amount of broadcast traffic and creates a security nightmare
Basically, a VLAN is a collection of nodes that are grouped together in a single broadcast domain that is based on something other than physical location.
Virtual local area network (VLAN) – allow you to segment the network using switches you already have
To create a VLAN, take a single physical broadcast domain and chop it up into multiple virtual broadcast domains
Require special switches loaded with extra programming to create the virtual networks
Since this is a logical segmentation and not a physical one, workstations do not have to be physically located together
Users on different floors of the same building, or even in different buildings can now belong to the same LAN

4. History of VLAN Developed by Dr. W. David Sincoskie (1984)
Addressed the problem of scaling up Ethernet
Invented VLANs by adding a tag to
each Ethernet packet
By sending a mix of different packets,
bandwidth could be improved
802.1Q header, or VLAN tag
History of VLAN
Dr. W. David Sincoskie (1984)
Addressed the problem of scaling up Ethernet
However, no good way of connecting multiple Ethernet network together
Sincoskie invented VLANs by adding a tag to each Ethernet packet
Tags could be thought of as colors –ex. Red, green, or blue
Each switch could be assigned to handle packets of a single color and ignore the rest
By sending a mix of different packet colors, bandwidth could be improved
Color is now known in the Ethernet frame as the 802.1Q header, or VLAN tag

5. Why use VLANs? VLANs have several advantages Performance
Formation of Virtual Workgroups
Simplified Administration
Reduced Cost
Security
Why use VLANs?
Performance
VLAN’s can reduce the need to send such traffic to unnecessary destinations
VLAN’s reduce the number of routers needed
Formation of Virtual Workgroups
Can contain broadcasts and multicasts within a temporary workgroup
Simplified Administration
If a user is moved in a VLAN, most administrative work (i.e. recabling, new station addressing, & reconfiguration) can be reduced or eliminated.
Reduced Cost
VLAN’s can be used to create broadcast domains which eliminate the need for expensive routers
Security
Placing certain users who have access to certain data on a VLAN can reduce the chances of an outsider gaining access to the data.

6. Setup
How to set it up:
Single physical broadcast domain and chop it up
Require special switches.

7. 1 Switch = 2 VLANs “VLAN” plus a # Ex. VLAN1 or VLAN2
Switch with 2 VLANs
Multiple ways to support VLANs
Assign ports to a VLAN
Assign MAC addresses to determine VLAN membership

8. Configuring a VLAN-Capable Switch
Access the switch with a Web browser interface.

9. Configuring a VLAN-Capable Switch
Define VLANs

10. Configuring a VLAN-Capable Switch
Assign computers’ MAC addresses to VLANs or assign ports to VLANs

11. Trunking Transferring VLAN traffic between two or more switches
A port on each switch must be configured as a trunk port.
Trunk Port

12. Virtual Trunk Protocol
Used to automate the updating of multiple VLAN switches
3 Stages
Server
Client
Transparent
All the connected client switches update their configurations within minutes

13. InterVLAN Routing
Process of making a router work between two VLANS is interVLAN routing.
Each VLAN becomes its own broadcast domain.
No way for data to get from one VLAN to another unless you use a router