Transcript Virtual LAN Presentation

Virtual LAN (VLAN)
Christopher Lee
Leo Putra Mardjuki
Table of Contents
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Introduction
Two approaches to designing VLAN:
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Single-Switch VLAN
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Multi-Switch VLAN
Operating Characteristics
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The four layers of VLANs
Advantages
Disadvantages
Conclusion
References
Questions time
Introduction
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VLAN stands for Virtual Local Area
Network.
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viewed as a group of devices on different
physical LAN
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can communicate with each other as if they
were all on the same physical LAN
Configured through software rather than
hardware
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extremely flexible.
Single-Switch VLAN
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VLAN operates only
inside one switch
There are different
types of Single-Switch
VLAN:
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Layer
Layer
Layer
Layer
1
2
3
4
Layer-1 VLANs
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Port-based VLANs
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Uses the physical layer port
number on the front of the
VLAN switch to assign
computers to VLAN segments
Network manager must know
which computer is connected
to which port
Advantage
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Configuration is fairly
straightforward
Layer-2 VLANs
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MAC-based VLANs
Uses the data link layer
address to form the VLANs
Advantage:
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Simpler to manage when
computers are moved
NO configuration is needed
Layer-3 VLANs
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IP-based VLANs
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Compared to Layer-2:
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Uses the network layer
address to form the VLANs
Reduce the time spent
reconfiguring the network
A bit slower at processing
each message
Advantage:
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Can manually input/change
IP addresses
NO configuration is needed
Layer-4 VLANs
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Application-based VLANs
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Very complex process
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Uses the type of application indicated
by port number in the TCP packet in
combination with the network layer
addresses to form the VLAN groups
Network manager must decide on
variety of different factors in forming
the VLANs
Advantage:
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Very precise allocation of network
capacity
Multi-Switch VLAN
Multi-Switch VLAN cont.
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Works the same way as a Single-Switch
VLAN, except:
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Several switches are used
Switches must be able to send packets
among themselves in a way that
identifies the VLAN to which the packet
belongs.
Advantages
Increased performance
 Improved manageability
 Physical independence
 Increased Security Option
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Disadvantages
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Costly
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Software based
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Human labor to program
Depending on variety switches
Management complexity
Conclusion
Reduce the cost of dealing with moves
and changes
 For organizations,
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seen as an added benefit
References
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"VLAN Information." UCDavis Network 21. 06 Mar. 2006
<http://net21.ucdavis.edu/newvlan.htm>.
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"VLAN." 06 Mar. 2006
<http://www.webopedia.com/TERM/V/VLAN.html>.
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"Answers.com." Virtual LAN. 06 Mar. 2006
<http://www.answers.com/topic/virtual-lan?method=6>.
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"Network World Research Center." VLAN (Virtual LAN). 06 Mar. 2006
<http://www.networkworld.com/details/471.html>.
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"The Virtual LAN Technology Report." 1996. decisys. 06 Mar. 2006
<http://www.3com.com/other/pdfs/solutions/en_US/20037401.pdf>.
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"Virtual LAN." Wikipedia The Free Online Encyclopedia. 02 Mar. 2006.
06 Mar. 2006 <http://en.wikipedia.org/wiki/VLAN>.
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