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VLAN and Trunking
On Cisco Devices, VTP ( VLAN Trunking Protocol ) maintains VLAN configuration consistency across the entire network.
** Cisco home page for Virtual LANs / VLAN Trunking Protocol ( VLANs / VTP ) ( discusses DSL, DTP, GVRP, ISL, VTP, 802. 1Q )
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# REDIRECT VLAN Trunking Protocol

VLAN and Protocol
* MVRP Multiple VLAN Registration Protocol ( formerly GVRP GARP VLAN Registration Protocol )
Inefficient and conservative use of a 16-bit Tag Protocol Identifier ( TPID ) on each 32-bit VLAN Tag, followed by the trailing lone 16-bits creates a 48-bit Signature that can not easily be mistaken as part of the payload.
# REDIRECT Multiple Registration Protocol # Multiple VLAN Registration Protocol ( MVRP )
Client switches query the VMPS server using the VLAN Query Protocol, or VQP.

VLAN and VTP
VTP is responsible for synchronizing VLAN information within a VTP domain and reduces the need to configure the same VLAN information on each switch.
Cisco switches run an instance of STP for each VLAN, and since VTP propagates VLANs across the campus LAN, VTP effectively creates more opportunities for a bridging loop to occur.
All switches in the same management domain share their VLAN information with each other, and a switch can participate in only one VTP management domain.
This information may include the operating system version, hostname, every address ( i. e. IP address ) from all protocol ( s ) configured on the port where CDP frame is sent, the port identifier from which the announcement was sent, device type and model, duplex setting, VTP domain, native VLAN, power draw ( for Power over Ethernet devices ), and other device specific information.
To do this, VTP carries VLAN information to all the switches in a VTP domain.

VLAN and is
One implementation of this concept is termed a " private VLAN ".
This is because a virtual LAN ( or VLAN ) is technically a broadcast domain.
In computer networking, virtual local area network, virtual LAN or VLAN is a concept of partitioning a physical network, so that distinct broadcast domains are created.
In an environment employing VLANs, a one-to-one relationship often exists between VLANs and IP subnets, although it is possible to have multiple subnets on one VLAN.
This " color " is what is now known in the Ethernet frame as the 802. 1Q header, or the VLAN tag.
Configuration of the first custom VLAN port group usually involves removing ports from the default VLAN, such that the first custom group of VLAN ports is actually the second VLAN on the device, in addition to the default VLAN.
It is only when the VLAN port group is to extend to another device that tagging is used.
Some switches either allow or require a name be created for the VLAN, but it is only the VLAN group number that is important from one switch to the next.
Where a VLAN group is to simply pass through an intermediate switch via two pass-through ports, only the two ports must be a member of the VLAN, and are tagged to pass both the required VLAN and the default VLAN on the intermediate switch.
If the default VLAN were deleted or renumbered without first moving the management connection to a different VLAN, it is possible for the technician to be locked out of the switch configuration, requiring a forced clearing of the device configuration ( possibly to the factory default ) to regain access.

VLAN and Cisco
Cisco also implemented VLANs over FDDI by carrying VLAN information in an IEEE 802. 10 frame header, contrary to the purpose of the IEEE 802. 10 standard.
Inter-Switch Link ( ISL ) is a Cisco proprietary protocol used to interconnect multiple switches and maintain VLAN information as traffic travels between switches on trunk links.
Cisco also has a proprietary trunking protocol called Inter-Switch Link which encapsulates the Ethernet frame with its own container, which labels the frame as belonging to a specific VLAN.
* ( Cisco Example ) VLAN Tagging
* Cisco Inter-Switch Link, a proprietary Cisco VLAN trunking protocol
* Cisco Inter-Switch Link ( ISL ) is a Cisco proprietary protocol that maintains VLAN information as traffic flows between switches and routers.
VSANs were designed by Cisco, modelled after the virtual local area network ( VLAN ) concept in Ethernet networking.
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 AClS.
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.
Cisco Inter-Switch Link ( ISL ) is a Cisco Systems proprietary protocol that maintains VLAN information in Ethernet frames as traffic flows between switches and routers, or switches and switches.
ISL is Cisco's VLAN tagging protocol and is supported only on some Cisco equipment over Fast and Gigabit Ethernet links.
It is offered as an option to the IEEE 802. 1Q standard, a widely used VLAN tagging protocol, although the use of ISL for new sites is deprecated by Cisco.

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