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Topic: Virtual LAN


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In the News (Tue 23 Jul 19)

  
  Virtual LAN - Wikipedia, the free encyclopedia
A virtual LAN, commonly known as a vLAN or as a VLAN, is a logically-independent network.
Virtual networks can also serve to restrict access to network resources without regard to physical topology of the network, although the strength of this method remains debatable.
Virtual LANs operate at layer 2 (the data link layer) of the OSI model.
en.wikipedia.org /wiki/Virtual_LAN   (429 words)

  
 Virtual LAN
A virtual LAN, commonly known as a VLAN, is a logically segmented network mapped over physical hardware.
Another purpose of a virtual network is to restrict access to network resources without regard to physical topology of the network, although the strength of this method is debatable.
Virtual LANs operate at layer 2 of the OSI model.
www.ebroadcast.com.au /lookup/encyclopedia/vl/VLAN.html   (216 words)

  
 FlightSim.Com NOTAMS
Lan Virtual has the pride on counting, for a few months now, with the virtual domain www.lanvirtual.com, something that very few virtual airlines are lucky enough to have.
Lan Virtual, within its 3 years existence as such, has formed a vast network of virtual pilots, creating the widest community of this kind in Chile and in South America (except maybe for Brazil).
Summing up, Lan Virtual has come to be a modern and high standard virtual airline, and thanks to teamwork, an enthusiastic community and the support of Lan Airlines, we are nowadays among the most professional and dedicated virtual airlines in the world, being a true icon on virtual aviation.
www.flightsim.com /cgi/kds?$=main/notams05/lanv0224.htm   (1718 words)

  
 RFC 2338 (rfc2338) - Virtual Router Redundancy Protocol   (Site not responding. Last check: 2007-10-21)
Virtual Router Master The VRRP router that is assuming the responsibility of forwarding packets sent to the IP address(es) associated with the virtual router, and answering ARP requests for these IP addresses.
If the virtual router MAC address is never used as the source address in a link level frame then the station location is never learned, resulting in flooding of all packets sent to the virtual router.
The virtual router MAC address is used as the source in all periodic VRRP messages sent by the Master router to enable bridge learning in an extended LAN.
www.faqs.org /rfcs/rfc2338.html   (5834 words)

  
 Virtual LAN in practice
As a part of emerging LAN switching technology, Virtual LANs are one of the most promising and intriguing concepts yet very unknown in practice.
Virtual LAN technology is one of the most important (and sometimes confusing) topics in switched networking.
Virtual LANs are a necessity for switching because they provide an important element in the migration from shared media hub/router network models to fully switched networks.
www.open.hr /dors/dors97/works/DistributedComputing/03   (1315 words)

  
 Internetworking with ATM-based Switched Virtual Networks
When a LAN segment is congested and the endstations on that segment ask for more bandwidth, the number of endstations on the segment should be reduced.
As it was the case in the previous solutions, the endstations on the same relational LAN have zero hop distance regardless of their physical location on the network.
Virtual networking which implements a logical configuration for internetworking is the cost efficient solution for today and tomorrow.
www.isoc.org /HMP/PAPER/142/html/inter.fr4.html   (4024 words)

  
 VIVID - BuildingLANs   (Site not responding. Last check: 2007-10-21)
As today's shared media LAN internetworks are beginning to hit performance and management limitations, caused in part by explosive growth, network designers are faced with the challenge of charting a course to "next generation" architectures that can user demands for the foreseeable future.
Virtual LANs are a general concept that allow the separation of the logical address of a device from the physical location of that device.
Moving a device from one port to another requires the network manager to change the network management station's definition of the virtual LAN to include the new port that the device is moving to, and to remove the port from the old virtual LAN.
www.ing.ula.ve /~mjerez/newbridge/BLANnew.html   (3769 words)

  
 Virtual resources for LINUX on iSeries
Data transfer across the virtual LAN may not be at the expected rate depending on what is being accessed and how it is being accessed.
Virtual LAN is available to OS/400 partitions as well as Linux partitions (both hosted and non-hosted Linux partitions).
Virtual LAN creates a high-speed virtual Ethernet segment that can be used to connect logical partitions in a physical iSeries server.
www.ibm.com /developerworks/eserver/library/l-vresources?ca=drs-l4304   (2849 words)

  
 Virtual LAN - FOLDOC Definition   (Site not responding. Last check: 2007-10-21)
To define a virtual LAN, the network administrator uses a virtual LAN management utility to establish membersip rules that determine which hostss are in a specific virtual LAN.
Subnet-oriented virtual LANs are based on subnet addresses used by IP, IPX, and other network layer protocols to normally identify physical networks.
Once identified as a virtual subnet, the selected LANs function as a bridge group - traffic is bridged at Layer 2 within the virtual subnet and routed at Layer 3 between virtual subnets.
www.nightflight.com /foldoc-bin/foldoc.cgi?Virtual+LAN   (220 words)

  
 [No title]
A virtual (or logical) LAN is a local area network with a definition that maps workstations on some other basis than geographic location (for example, by department, type of user, or primary application).
Virtual LAN Technologies provides the service, interconnecting you wherever you are throughout the world, providing convenient access to your data and programs.
Every switch manufacturer recognizes the need to support some form of virtual LAN, and often a vendor's virtual LAN capability is parallel with their switching capability.
www.bridgeport.edu /~ahameed/cp471/vlan.html   (4108 words)

  
 VLAN Information   (Site not responding. Last check: 2007-10-21)
The individual LANs and broadcast domains are represented by the areas bounded by the dotted lines and numbered 1 through 5 for future reference.
Virtual LANs (VLANs) can be viewed as a group of devices on different physical LAN segments which can communicate with each other as if they were all on the same physical LAN segment.
Notice that the initial logical LAN topology from Figure 1 has been restored, with the major changes being the addition of Ethernet switches and the use of only one router.
net21.ucdavis.edu /newvlan.htm   (3462 words)

  
 Virtual Local Area Networks
Virtual Local Area Networks (VLAN's) were developed as an alternative solution to using routers to contain broadcast traffic.
A LAN segment is also known as a collision domain since collisions remain within the segment.
Another problem with setting up virtual workgroups is the implementation of centralized server farms, which are essentially collections of servers and major resources for operating a network at a central location.
www.cse.wustl.edu /~jain/cis788-97/ftp/virtual_lans   (3565 words)

  
 Overview of Routing between Virtual LANs
By containing traffic originating on a particular LAN only to other LANs in the same VLAN, switched virtual networks avoid wasting bandwidth, a drawback inherent to traditional bridged and switched networks in which packets are often forwarded to LANs with no need for them.
Implementation of VLANs also improves scalability, particularly in LAN environments that support broadcast- or multicast-intensive protocols and applications that flood packets throughout the network.
By creating virtual LANs, system and network administrators can control traffic patterns and react quickly to relocations and keep up with constant changes in the network due to moving requirements and node relocation just by changing the VLAN member list in the router configuration.
www.cisco.com /univercd/cc/td/doc/product/software/ios113ed/113ed_cr/switch_c/xcvlan.htm   (1587 words)

  
 [No title]
The second virtual interface is the one used to form the virtual LAN.
The packet flow use to form the virtual LAN are illustrated in Figure 1 as follows.
The virtual IP address is used to find the correct output port, and the other fields serve to assist in constructing the packet headers.
www.cs.rutgers.edu /~rmartin/teaching/fall04/cs552/assign2.html   (545 words)

  
 BYTE.com   (Site not responding. Last check: 2007-10-21)
Virtual LANs are an outgrowth of switching technologies (Ethernet and ATM) that are making their way into corporate networks.
With virtual LANs, the changes, as noted, are done at a management station, not by going into a wiring closet.
You could handle either situation with a virtual LAN, or you could use the old method of going into the wiring closet and physically connecting the desired server to an appropriate LAN segment.
www.byte.com /art/9505/sec13/art4.htm   (1644 words)

  
 Virtual Lan Training - Learn virtual lans study Virtual Laning training classes Virtual Lan courses   (Site not responding. Last check: 2007-10-21)
This complete set of 12 Units is designed to teach the student the necessary materials and understanding of Cisco Routers and to prepare the student to take the Cicso Certified Network Associates exam to gain the IT certification of CCNA.
Virtual LANs and shared LAN technologies are also covered.
LAN Fundamentals is the second course of the LAN/WAN Basics curriculum that comprises three courses.
training-classes.com /course_hierarchy/keyword_index/virtual_lan.html   (481 words)

  
 VLAN: Virtual Local Area Network (Virtual LAN) and IEEE 802.1Q
Virtual LAN (VLAN) is a group of devices on one or more LANs that are configured so that they can communicate as if they were attached to the same wire, when in fact they are located on a number of different LAN segments.
The IEEE 802.1Q standard defines the operation of VLAN Bridges that permit the definition, operation and administration of Virtual LAN topologies within a Bridged LAN infrastructure.
The PRE is an alternating pattern of ones and zeros that tells receiving stations that a frame is coming, and that provides a means to synchronize the frame-reception portions of receiving physical layers with the incoming bit stream.
www.javvin.com /protocolVLAN.html   (788 words)

  
 Ethernet - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-21)
It has become the most widespread LAN technology in use during the 1990s to the present, and has largely replaced all other LAN standards such as token ring, FDDI, and ARCNET.
By software convention, the 16 bits after the destination and source address fields were a packet type field, but, as the paper says, "different protocols use disjoint sets of packet types", so those were packet types within a given protocol, rather than the packet type in current Ethernet, which specifies the protocol being used.
Metcalfe and Saltzer worked on the same floor at MIT's Project MAC while Metcalfe was doing his Harvard dissertation, in which he worked out the theoretical foundations of Ethernet.
www.sciencedaily.com /encyclopedia/ethernet   (4819 words)

  
 Dictionary and Encyclopedia - "V" Listings
VSWR value ranges from 1 (matched load) to infinity for a short or an open load.
For most wireless LAN antennas the maximum acceptable value of VSWR is 2.0.
Related values are the Reflection Coefficient and Return Loss which are algorithmically derived from VSWR.
www.connect802.com /encyclopedia/enc-v.htm   (324 words)

  
 MRV Communications, Inc. - Virtual Private LAN Services   (Site not responding. Last check: 2007-10-21)
Virtual Private LAN Services, or Layer-2 VPNs, provide customers with an extension of their local network.
Regardless of the core network architecture, at the network egress, the original packet is restored, including any VLAN tag that the packet may have had.
This architecture allows the customer’s network to be independent of the configuration of the provider’s network, a critical component of any Virtual Networking service.
www.mrv.com /technology/vp_lan_services.php   (798 words)

  
 [No title]
Preferred Path Indication A simple model of Master election among a set of redundant routers is to treat each router with equal preference and claim victory after converging to any router as Master.
Efficient Operation over Extended LANs Sending IP packets on a multiaccess LAN requires mapping from an IP address to a MAC address.
Additionally, routers MAY support unicast mode of operation to take advantage of newer token ring adapter implementations that support non-promiscuous reception for multiple unicast MAC addresses and to avoid both the multicast traffic and usage conflicts associated with the use of token ring functional addresses.
www.ietf.org /rfc/rfc3768.txt   (3011 words)

  
 LearnIT: Virtual LAN   (Site not responding. Last check: 2007-10-21)
The virtual LAN controller can change or add workstations and manage load balancing and bandwidth allocation more easily than with a physical picture of the LAN.
Network management software keeps track of relating the virtual picture of the local area network with the actual physical picture.
The standard 802.1q defines the operation of Virtual LAN (VLAN) Bridges that permit the definition, operation and administration of Virtual LAN topologies within a Bridged LAN infrastructure.
searchnetworking.techtarget.com /content/0,290959,sid7_gci929172,00.html   (1151 words)

  
 Virtual LANs
This chapter describes virtual LAN (VLAN) features and functionality, the Virtual LAN Menu of the Catalyst 2820 and Catalyst 1900 switches, and procedures for creating VLANs and assigning ports to VLANs.
Use the Virtual LAN Menu to perform the following tasks, which are described in this chapter:
Because each VLAN is a logical LAN segment, one instance of STP maintains a loop-free topology in each VLAN.
www.cisco.com /univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/02vlans.htm   (8660 words)

  
 VPLS.ORG: VPLS (Virtual Private LAN Service) Technical Overview   (Site not responding. Last check: 2007-10-21)
Recently, there has been increased interest in Layer 2 MPLS based services, which support LAN and legacy traffic, and are lower cost and simpler to manage.
Virtual Private LAN Service (VPLS) is a fast growing Layer 2 MPLS based service that offers multi-point connectivity; making enterprise LANs in multiple sites appear as if they are on the same LAN.
Using Metro Ethernet, Ethernet Virtual Private Lines and VPLS allows carriers to aggregate broadband services more cost effectively and to reach customers in areas where previously it did not make sense economically.
www.vpls.org /vpls_technical_overview.shtml   (1906 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
IPR Disclosure Acknowledgement By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79.
A VPLS creates an emulated LAN segment for a given set of users, i.e., it creates a Layer 2 broadcast domain that is fully capable of learning and forwarding on Ethernet MAC addresses that is closed to a given set of users.
It describes a simple and scalable way to offer Virtual LAN services, including the appropriate flooding of broadcast, multicast and unknown unicast destination traffic over MPLS, without the need for address resolution servers or other external servers, as discussed in [L2VPN-REQ].
www.ietf.org /internet-drafts/draft-ietf-l2vpn-vpls-ldp-08.txt   (7430 words)

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