VLAN hopping virtual local area network hopping is a exploit computer security computer security exploit , a method of attacking networked resources on a VLAN . The basic concept behind all VLAN hopping attacks is for an attacking host on a VLAN to gain access to traffic on other VLANs that would normally not be accessible. There are two primary methods of VLAN hopping switch spoofing and double tagging. In a switch spoofing attack, an attacking host that is capable of speaking the tagging and trunking protocols used in maintaining a VLAN imitates a trunking switch. Traffic for multiple VLANs is then accessible to the attacking host. In a double tagging attack, an attacking host prepends two VLAN tags to packets that it transmits. The first header which corresponds to the VLAN that the attacker is really a member of is stripped off by a first switch the packet encounters, and the packet is then forwarded. The second, false, header is then visible to the second switch that the packet encounters. This false VLAN header indicates that the packet is destined for a host on a second, target VLAN. The packet is then sent to the target host as though it were Data link layer layer 2 traffic ... web server on a VLAN called VLAN1. Hosts on VLAN1 are allowed access to the web server hosts from outside the VLAN are blocked by layer 3 filters. An attacking host on a separate VLAN, called VLAN2 ... VLAN. The packet thus arrives at the target server as though it was sent from another host on VLAN1 ... capable of creating VLAN hopping packets References cite web url http rikfarrow.com Network net0103.html title VLAN Insecurity author Rik Farrow accessdate 2011 03 19 cite web url http www.cisco.com en ... Configuration Examples Related to VLAN Features publisher Cisco Systems accessdate 2011 03 19 cite ... title Response to BugTraq 802.1q Trunking VLAN Security publisher Cisco Systems accessdate 2011 ... title VLAN Security White Paper publisher Cisco Systems accessdate 2011 03 19 compu ... more details
A private VLAN is a technique in computer networking where a virtual LAN VLAN contains network switch switch ports that are restricted, such that they can only communicate with a given uplink . The restricted ports are called private ports . Each private VLAN typically contains many private ports, and a single uplink. The uplink will typically be a port or link aggregation group connected to a router , Firewall computing firewall , server computing server , Internet service provider provider network, or similar central resource. The switch forwards all frame telecommunications frames received on a private port out the uplink port, regardless of VLAN ID or destination MAC address . Frames received on an uplink port are forwarded in the normal way i.e., to the port hosting the destination MAC address, or to all VLAN ports for unknown destinations or broadcasting computing broadcast frames . Peer to peer traffic is blocked. Note that while private VLANs provide isolation at the data link layer, communication at higher layers may still be possible. A typical application for a private VLAN is a hotel or Ethernet to the home network where each room or apartment has a port for Internet access . Similar port isolation is used in Ethernet based ADSL DSLAM s. Allowing direct data link layer communication between customer nodes would expose the local network to various security attacks, such as ARP spoofing , as well as increasing the potential for damage due to misconfiguration. Another application of private VLANs is to simplify Internet Protocol IP address assignment. Ports can be isolated from each other at the data link layer for security, performance, or other reasons , while belonging to the same IP subnetwork subnet . In such a case direct communication between the IP hosts on the protected ports is only possible through the uplink connection by using MAC Forced Forwarding or a similar Proxy ARP based solution. See also Ethernet Broadcast domain Related Requests For Comments ... more details
VTP redirects here, for the mathematical abbreviation see vector triple product File VLAN Trunking Protocol .gif thumb right 300px Example without and with VTP Click to Play VLAN Trunking Protocol VTP ..., and renaming of Virtual Local Area Networks VLAN on a network wide basis. Cisco s VLAN Trunk Protocol reduces administration in a switched network. When a new VLAN is configured on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. To do this, VTP carries VLAN information to all the switches in a VTP domain ... http www.javvin.com protocolVTP.html Cisco VTP VLAN Trunking Protocol Bot generated title ref The comparable IEEE standard in use by other manufacturers is GARP VLAN Registration Protocol GVRP or the more recent Multiple VLAN Registration Protocol MVRP . VTP Modes VTP operates in one of three modes ... servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on messages received over trunk links. VTP server ... do not participate in VTP. A VTP transparent switch will not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received messages. VLANS can be created ... Ring Bridge Relay Function TrBRF and Token Ring Concentrator Relay Function TrCRF VLAN are supported ... basis. br Provides the ability to propagate the VLAN database and other databases. ref name javvin ... 2. br In a Token Ring environment, you must enable VTP version 2 for Token Ring VLAN switching to function ... domain. vtp password password Step 4 Verify the VTP configuration. show vtp status VLAN Pruning ... ports on the intended VLAN. This enables more efficient use of trunk bandwidth. Each switch will advertise ... VLANs that are not active across that trunk, thus saving bandwidth. If a VLAN is then added to one ... neighbors. For this to work, VLAN pruning must be enabled on both ends of the trunk. It is easiest ... more details
class infobox style width 25em font size 95 colspan 2 bgcolor 0E48AF align center colspan 2 style font size larger font color white Avaya VLAN Manager font align center colspan 2 Commented out because image was deleted Image VLAN Manager.JPG 400px center style vertical align top Avaya VLAN Manager in computer networking is the name of a Java programming language Java Network Management Application sold by Avaya used to centrally manage and configure VLAN information. The application allows a manager to globally discover, view, and configure VLAN information on individual or multiple switches from a single interface. The VLAN manager is integrated into the Avaya Enterprise Switch Manager application. See also Avaya Avaya Multi link Trunking Manager Multi Link Trunk Manager Avaya Multicast Manager Multicast Manager Avaya Log Manager Log Manager Avaya Device Manager Device Manager Avaya Security Manager Security Manager Avaya File and Inventory Manager File and Inventory Manager Avaya Routing Manager Routing Manager External links http products.nortel.com go product assoc.jsp?segId 0&parId 0&catId E&rend id 11451&contOid 100179338&prod id 29581&locale en US Enterprise Switch Manager Features & Benefits http products.nortel.com go product content.jsp?parId 0&segId 0&catId E&prod id 29581&locale en US Enterprise Switch Manager Avaya network software stub Category Avaya Category Nortel products VLAN ... more details
Multicast VLAN Registration MVR is a protocol for Layer 2 Internet Protocol IP networks that enables multicast traffic from a source VLAN to be shared with subscriber VLANs. The alternative would be to use Protocol Independent Multicast PIM or a similar protocol to route the traffic through a Network Layer Layer 3 network. MVR is typically used for IPTV like services and is therefore usually only available on enterprise level switches. Many manufacturers Cisco , Extreme Networks , Juniper ,... provide support for MVR on their high end switches. The main reason for using MVR is to save bandwidth by preventing duplicate multicast streams being sent in the core network, instead the stream s are received on the MVR VLAN and forwarded to the VLANs where hosts have requested it them. Category Routing protocols ... more details
A VLAN Management Policy Server or VMPS is a network switch that contains a mapping of device information to VLAN . The primary goal of VMPS is VLAN assignment for general network management purposes, but can also be used for providing security through segregating clients with an unknown MAC address , or through further extension of the protocol to provide login for Cisco ACS. This last functionality is now deprecated by Cisco, in favour of 802.1x , and as the VMPS technology is Cisco only, the VLAN assignment can now be carried out in the 802.1x framework. Client switches query the VMPS server using the VLAN Query Protocol, or VQP . Only Cisco produces hardware with VMPS client functionality, and is currently fully supported across their IOS switching lines. Cisco officially only supports the use of Catalyst 4000, 5000 and 6500 switch platforms with appropriate firmware as VMPS servers, but these have limited functionality, and only support a static text file transferred into them with tftp . Third party servers To enhance functionality, which can talk to SQL or use external programs to decide on network access for a given request. The first publicly available of these was OpenVMPS , by Dori Seliskar and others, with FreeRADIUS , FreeNAC and Icarus VMPSd available and including additional management tools to help manage hundreds or thousands of clients and MAC addresses and their VMPS support. FreeNAC is an OpenSource tool that includes OpenVMPS for communication with the switches, but also adds a database, automation, reporting and SNMP scanning to allow VMPS to be more easily used in larger environments. External links http www.cisco.com en US tech tk389 tk689 technologies tech note09186a00800c4548.shtml Cisco document on VMPS http sourceforge.net projects vmps OpenVMPS on Sourceforge http sourceforge.net projects vmpsd Icarus VMPSd on Sourceforge http sourceforge.net ... commercial VLAN administration suite Compu network stub Category Cisco protocols de VMPS ... more details
A switch virtual interface SVI is a Virtual LAN VLAN of switch ports represented by one interface to a routing or bridging system. There is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from all switch ports associated with the VLAN. There is one to one mapping between a VLAN and SVI, thus only a single SVI can be mapped to a VLAN. In default setting, an SVI is created for the default VLAN VLAN1 to permit remote switch administration. An SVI cannot be activated unless associated with a physical port. SVIs are generally configured for a VLAN for the following reasons Allow traffic to be routed between VLANs by providing a default gateway for the VLAN. Provide fallback bridging if required for non routable protocols . Provide Layer 3 IP connectivity to the switch. Support bridging configurations and routing protocol. References Cisco Systems , 2006, Building Cisco Multilayer Switched Networks Version 3.0 , Cisco Systems Inc. compu network stub Category Computer networking ... more details
, such as VLAN identifiers and multicast group membership across a large LAN . MRP operates at the Data ... so bridges or other devices like switches could register and de register attribute values, such as VLAN ... was used by two applications GARP VLAN Registration Protocol GVRP for registering VLAN trunking between ... both mostly enhancements for VLAN aware switches as defined in IEEE 802.1Q . MRP was introduced as a replacement ... with Multiple VLAN Registration Protocol MVRP . The change essentially moved the definition of GARP, GVRP, and GMRP into 802.1Q based environment, implying that they were already VLAN aware. This also ... Protocol . Multiple VLAN Registration Protocol MVRP Multiple VLAN Registration Protocol MVRP formerly known as GARP VLAN Registration Protocol GVRP is a standards based Data link layer Layer 2 Communications protocol network protocol , for automatic configuration of VLAN information on network switch ... provides a method to dynamically share VLAN information and configure the needed VLANs. For example, in order to add a switch port to a VLAN, only the end port, or the VLAN supporting network device connected to the switchport, need be reconfigured, and all necessary VLAN trunks are dynamically created on the other MVRP enabled switches. Without using MVRP, either a manual configuration of VLAN trunks or use of a manufacturer s proprietary method is necessary. It is through MVRP that Dynamic VLAN entries will be updated in the Filtering Database. In short, MVRP helps to maintain VLAN configuration ... and distribution of VLAN membership information by means of the MVRP Static configuration of VLAN membership information via Management mechanisms, which allow configuration of Static VLAN Registration ... mechanisms and for other VLANs, MVRP is relied on to establish the configuration. The Multiple VLAN Registration Protocol MVRP defines a MRP Application that provides the VLAN registration service ... VLAN Registration Entries for each VLAN, and for propagating the information they contain to other ... more details
The VLAN Query Protocol VQP was developed by Cisco and allows end devices on LAN s to be authenticated via their MAC address and an appropriate VLAN attributed to the port, using a VLAN Management Policy Server . As VQP is a cisco only protocol, many other vendors including Cisco now support VLAN assignment through 802.1x responses, with authentication using simple MAC Auth. Upon physically connecting a device to a port of a switch configured as a VMPS client, the switch begins listening for packets, and encapsulates and rebroadcasts the first packet received into a VQP packet, which is sent to one of up to two configured VMPS servers on port udp 1589. The VMPS server will give one of 4 responses Allow, Deny, Shutdown, Wrong Domain and the switch will either assign the port to the appropriate VLAN, put the port back into the pre confirmation state, shut down the port until the device or another one is physically reconnected, or log an error indicating that it is incorrectly configured. The latter result is often due to Cisco documentation failing to mention that the domain name in the VMPS configuration file must match the VTP domain name. If reconfirmation of VLAN assignment is required, it is done in the same manner as initial confirmation, with the exception of including the currently assigned VLAN for the port in the VQP packet. Reconfirmation is done periodically based on configuration directives of the client switches, or can be forced with a switch command line directive. The VQP Protocol has no checksums, encryption or authentication of either the client or the switch messages. The protocol also does not include scope to send a message to the server informing that a device has been disconnected. External links http www.filewatcher.com n vqpcli.pl.4941.0.0.html Perl VQP Client Category Network related software network software stub fr VLAN Query Protocol ... more details
Multiple issues confusing October 2010 expert October 2010 wikify December 2010 orphan December 2010 A Jump Server is something similar to a Bastion host , except for the fact that it isn t designed to function as a secure machine. It is a host that can be used to jump to other hosts in the same subnet vlan , if the firewall in front of the jumpserver only allows access to the jumpservers IP Address but not to other hosts in that network or vlan. A JumpServer can be a potential risk in a network design. Category Network architecture ... more details
Technical date September 2010 IEEE 802.1Q , or VLAN tagging , is a computer network networking standard ... independent logical networks. IEEE 802.1Q defines the meaning of a virtual LAN VLAN with respect ... assigns a unique VLAN to each department. Edge switch es on the corporate network are configured to insert an appropriate VLAN tag into all data frames arriving from equipment belonging to a given ..., the VLAN tag is stripped before the frame is sent to another computer belonging to the same ... port. VLAN Identifier VID a 12 bit field specifying the VLAN to which the frame belongs. A value of 0 means that the frame does not belong to any VLAN in this case the 802.1Q tag specifies only ... values may be used as VLAN identifiers, allowing up to 4094 VLANs. On bridges, VLAN 1 is often reserved ... 2010 802.1Q Annex C. C.3.2.1.3 showed VLAN TAG before LLC SNAP header. EtherType in SNAP header should not a TPID 0x8100 . Because inserting the VLAN tag changes the frame, 802.1Q encapsulation forces ... traffic from clients that are already VLAN tagged. The outer next to source MAC and representing ISP VLAN S TAG service tag comes first, followed by the inner C TAG customer tag . In such cases, 802.1ad ... Device. Trunk ports and the native VLAN Clause 9 of the 1998 802.1Q standard defines the encapsulation protocol used to multiplexing multiplex VLANs over a single link, by adding VLAN tags ... and b the native VLAN for that trunk. The concept of a trunk port is that once a port is designated as a trunk port, it will forward and receive tagged frames. Frames belonging to the native VLAN do NOT carry VLAN tags when sent over the trunk. Conversely, if an untagged frame is received on a trunk port, the frame is associated with the Native VLAN for this port. For example, if an 802.1Q port has VLANs 2, 3 and 4 assigned to it with VLAN 2 being the Native VLAN, frames on VLAN 2 that egress exit ... which ingress enter this port and have no 802.1Q header are put into VLAN 2. Behaviour of traffic ... more details
orphan date November 2008 Hierarchical VLAN HVLAN is a proposed Ethernet standard that extends the use of enterprise Ethernet VLAN 802.1Q to carrier networks. A number of developments have emerged in recent ... of hierarchical addressing schemes into the VLAN tag to provide both enterprise and carrier transport ..., named VLAN, was introduced. VLAN 802.1Q A virtual LAN , commonly known as VLAN, is a method of creating ..., which makes them extremely flexible. Frames having a VLAN tag carry an explicit identification of the VLAN to which they belong. The value of the VLAN Identification VID in the tag header signifies the particular VLAN the frame belongs to. The main problem with VLAN is its limited VID space ... proposed to increase VLAN s scalability. A first proposal, called Q in Q, also known as Provider Bridge, VLAN stacking or tag stacking, allows service providers to insert an additional VLAN tag referred to as provider VLAN in the Ethernet frame in order to identify the service, resulting in a unique ... 4094 4094 , in reality, one provider VLAN is dedicated to one customer, and therefore the number ... overcomes the inherent scalability limitations of VLAN and Q in Q networks that make them impractical ... by traditional VLAN and Q in Q networks. In PBB and PBT switches at the edge of the carrier network ... than at the optimal point as in VLAN connectivity. Moreover the need to create forwarding entries for each unicast connection within the full mesh as opposed to a single VLAN forwarding tree in the case of VLAN connectivity will quickly become unsustainable as multipoint services become predominant ... felt need for leveraging the forwarding efficiency of VLAN networking, while at the same time solving its addressing space scalability issues described previously. Increasing the VLAN tag size ... hierarchy into the VLAN tag , in a way somewhat similar to classless subnets in the Internet Protocol ... . Conclusion Hierarchical VLAN is a proposed extension to VLAN which, like PBB and PBT, turns cost ... more details
Inter Switch Link can stand for In Fibre Channel is the link joining of two Fibre Channel switch es through Fibre Channel Ports E ports Cisco Inter Switch Link ISL is a Cisco Systems Cisco proprietary protocol that maintains VLAN information as traffic flows between switches and routers. disambig ... more details
Unreferenced stub auto yes date December 2009 Orphan date November 2006 VACL is an acronym for VLAN Access Control Lists where VLAN stands for Virtual Local Area Network. Specifically created to filter and move VLAN traffic. May be used like a SPAN port or network tap it is a way to replicate computer network data that is coming and going from a computer or a network of computers. This is useful if you want to monitor that traffic to determine the health of the application s running on those computer s or health of the network itself. VACL or VACL Ports can be much more discriminating of the traffic they forward than a standard SPAN port. They may be set to only forward specific types or specific VLANS to the monitoring port. However, they forward all traffic that matches the criteria as they do not have the functionality to select from Ingress filtering ingress or egress traffic like SPAN ports. See also Virtual private network Private VLAN DEFAULTSORT Vacl Category Local area networks Compu network stub ... more details
VTP may refer to Computing VTP VLAN Trunking Protocol , a proprietary Layer 2 messaging protocol. Venturi Transport Protocol , a proprietary transport layer protocol. OSI protocols Virtual Terminal Protocol Vista Transformation Pack Other Value of Total Plays , a term from the Slot machine fruit machine industry. disambig ... more details
Unreferenced date December 2009 Cisco Inter Switch Link ISL is a Cisco Systems proprietary protocol that maintains VLAN information as traffic flows between Network switch switches and router s, or switches and switches. ISL is Cisco s VLAN encapsulation method and supported only on Cisco s equipment through Fast and Gigabit Ethernet links. The size of an Ethernet encapsulated ISL Data frame frame can be expected to start from 94 bytes and increase up to 1548 bytes because of the overhead additional fields the protocol creates via encapsulation. ISL adds a 26 byte header containing a 15 bit VLAN identifier and a 4 byte CRC trailer to the frame. ISL functions at the Data link layer Data Link layer of the Open Systems Interconnection OSI model. ISL is used to maintain redundant links. Another related Cisco protocol, Dynamic Inter Switch Link Protocol DISL simplifies the creation of an ISL trunk from two interconnected Fast Ethernet devices. Fast EtherChannel technology enables aggregation of two full duplex Fast Ethernet links for high capacity backbone connections. DISL minimizes VLAN trunk configuration procedures because only one end of a link needs to be configured as a trunk. Cisco s ISL competes with the IEEE 802.1Q standard, a widely used VLAN tagging protocol. See also Dynamic Trunking Protocol DTP Category Cisco protocols Inter Switch Link de Inter Switch Link Protocol es Inter Switch Link fr Cisco Inter Switch Link pl Inter Switch Link pt Inter Switch Link ru Inter Switch Link ... more details
of packet loss and as a result improve efficiency. VLAN A VLAN, also known as a virtual LAN , is a method for dividing up a network regardless of physical infrastructure. A VLAN would be used when devices need to be separated as they have different requirements. As an example a VLAN can be created ... logical connection on the network is the most beneficial addition of a VLAN. Category Computer ... more details
The Dynamic Trunking Protocol DTP is a proprietary networking protocol developed by Cisco Systems for the purpose of negotiating trunking on a link between two Virtual LAN VLAN aware Network switch switches , and for negotiating the type of trunking Encapsulation networking encapsulation to be used. It works on the Data Link Layer Layer 2 of the OSI model . VLAN trunks formed using DTP may utilize either IEEE 802.1Q or Cisco Inter Switch Link Cisco ISL trunking protocols. DTP should not be confused with VLAN Trunking Protocol VTP , as they serve different purposes. VTP communicates VLAN existence information between switches. DTP aids with trunk port establishment. Neither protocol transmits the data Frame telecommunications frames that trunks carry. Switch port modes The following switch port mode settings exist auto &mdash causes the port to passively be willing to convert to trunking. The port will not trunk unless the neighbor is set to on or desirable . This is the default mode. Note that auto auto both ends default links will not become trunks. on &mdash forces the link into permanent trunking, even if the neighbor doesn t agree. off &mdash forces the link to permanently not trunk, even if the neighbor doesn t agree. desirable &mdash causes the port to actively attempt to become a trunk, subject to neighbor agreement neighbor set to on , desirable , or auto . nonegotiate &mdash forces the port to permanently trunk but not send DTP frames. For use when the DTP frames confuse the neighboring non Cisco 802.1Q switch. The neighboring switch must be set to trunking manually. See also Virtual LAN GARP VLAN Registration Protocol External links http www.cisco.com en US products hw switches ps663 products tech note09186a0080094713.shtml dtp Cisco Best Practices http packetlife.net blog 2008 sep 30 disabling dynamic trunking protocol dtp Packetlife Disabling Dynamic Trunking Protocol DTP Category Cisco protocols Category Ethernet compu network stub de Dynamic Trunking P ... more details
allows a single VLAN header to be inserted into an Ethernet frame. QinQ allows multiple VLAN .... specify date January 2011 In a multiple VLAN header context, out of convenience the term VLAN tag or just tag for short is often used in place of 802.1Q VLAN header . QinQ allows multiple VLAN ... frame, a QinQ frame is a frame that has 2 VLAN 802.1Q headers double tagged . Background ... VLANs inside service provider s provided VLAN. This way the service provider can just configure one VLAN for the customer and customer can then treat that VLAN as if it was a trunk. IEEE 802.1QinQ was created for the following reasons 802.1Q has a 12 bit VLAN ID field, which has a theoretical ... not have been available had the VLAN ID field simply been expanded from 12 bits to 24 bits .... A multi tagged frame not only has multiple VLAN IDs, but has multiple EtherTypes and other VLAN header ... some hypothetical new non 802.1Q extended VLAN ID field header. Frame format Image TCPIP 802.1ad ... Source Address SAMAC of the untagged frame and its ethertype field. The newly inserted VLAN header s ethertype is set to 0x8100 to identify the following data as a VLAN tag. 12 bits are used for the VLAN ID, the other bits in the VLAN fields are filled in according to the QoS policy, etc. of the interface .... Clarify date September 2010 12 bits are used for the VLAN ID, the other bits in the VLAN fields ... are connected by link S12. Acme s LAN uses VLAN IDs 10,11,12 in their network. The connections A1 and A2 are Ethernet trunks that have single tagged VLAN traffic, the traffic using IDs 10,11,12. Likewise ..., must segregate Acme s and XYZ s traffic. Since both Acme and XYZ share some VLAN IDs, traffic cannot be segregated by customer VLAN ID. The solution is for the SP to use QinQ in their network. They assign a single, unique outer VLAN tag ID of 100 for Acme, and a unique outer VLAN ID of 101 for XYZ ... will undergo a single pop operation, removing the outer VLAN tag with the ID 100. This pop operation ... more details
Port Mirroring is used on a network switch to send a copy of computer network network Packet information technology packets seen on one switch port or an entire VLAN to a network monitoring connection on another switch port. This is commonly used for network appliances that require monitoring of network traffic, such as an intrusion detection system . Port mirroring on a Cisco Systems switch is generally referred to as Switched Port Analyzer SPAN some other vendors have other names for it, such as Roving Analysis Port RAP on 3Com switches. An example of a SPAN configuration on a Cisco 2950 Switch is below. pre Monitor session 1 source interface fastethernet 0 1 , 0 2 , 0 3 Monitor session 1 destination interface fastethernet 0 4 encap ingress vlan 1 pre The above example mirrors data from ports 0 1, 0 2 and 0 3 to the destination port 0 4 using vlan1 for vlan tagging. To show the status of a SPAN monitor session use the following command. pre show monitor session 1 pre ...where 1 is the session number from the above statement... See also VACL External links Do not add forum, reseller, spam links to this article http www.cisco.com en US products hw switches ps708 products tech note09186a008015c612.shtml Cisco Systems Catalyst Switched Port Analyzer SPAN Configuration Example Category Computer network analysis he ... more details
ATU can refer to Aarne Thompson Uther Aarne Thompson Uther classification system of classifying folktales Accumulated thermal unit Address Table Unit ADSL Transceiver Unit Allameh Tabataba i University Amalgamated Transit Union antenna tuner Antenna Tuning Unit Arkansas Tech University Auto Teile Unger Finnish Rapid Deployment Force VLAN Table Unit disambig de ATU fr ATU it ATU ru ... more details
VMPS may mean Vivekanand Memorial Public School , a school in Raisinghnagar, India VLAN Management Policy Server , a networking protocol Veritone Minimum Phase Speakers , a manufacturer of loudspeakers Virginia Mason Production System , a Lean Healthcare production system based on the Toyota Production System pioneered by Virginia Mason Hospital & Medical Center of Seattle, WA disambig ... more details
unref date September 2009 In computer networking , a virtual storage area network VSAN is a collection of ports from a set of connected Fibre Channel switch es, that form a virtual Fibre Channel fabric fabric . Ports within a single switch can be partitioned into multiple VSANs, despite sharing hardware resources. Conversely, multiple switches can join a number of ports to form a single VSAN. VSANs were designed by Cisco Systems Cisco , modelled after the VLAN virtual local area network VLAN concept in Ethernet networking. In October 2004, the Technical Committee T11 approved VSAN technology into the American National Standards Institute ANSI as the standard. A VSAN, like each FC fabric, can offer different high level protocols such as Fibre Channel Protocol FCP , Fibre Channel over IP FCIP , FICON , iSCSI . Each VSAN is a separate self contained fabric using distinctive security policies, zones, events, memberships, and name services. Traffic is also separate. Unlike a typical fabric that is resized switch by switch, a VSAN can be resized port by port. The use of VSANs allows traffic to be isolated within specific portions of the network. If a problem occurs in one VSAN, that problem can be handled with a minimum of disruption to the rest of the network. VSANs can also be configured separately and independently. See also Storage area network Fibre Channel Fibre Channel fabric VLAN , for analogous mechanism in Ethernet Category Fibre Channel ... more details
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