D-Link DWS-3227P - xStack Switch - Stackable Instrukcja Użytkownika Pobierz pdf (Strona 8)

Semaphore Technologies Pvt. Ltd. – (technolo[email protected]om)

Motivation for VLAN

In a legacy network, users were assigned to networks based on geography and was

limited by physical topologies and distances. By using VLAN, one can logically group

networks and is no longer restricted by physical distance. This includes high-speed

technologies such as:

• Asynchronous Transfer Mode (ATM)

• Fiber Distributed Data Interface (FDDI)

• Fast Ethernet

• Gigabit Ethernet

• 10-Gigabit Ethernet

By using VLAN, one can control traffic patterns and react quickly to relocations.

VLANs provided the flexibility to adapt to changes in network requirements and

allowed for simplified administration. Additionally, it provided an increased security

measure and the ability to limit broadcasts.

Protocols and design

The protocol used in configuring virtual LANs is IEEE 802.1Q. The IEEE committee

defined this method of multiplexing VLANs in an effort to provide multi vendor VLAN

support. Prior to the introduction of the 802.1Q standard, several proprietary

protocols existed, such as Cisco's ISL (Inter-Switch Link, a variant of IEEE 802.10)

and 3Com's VLT (Virtual LAN Trunk). ISL is no longer supported by Cisco.

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D-Link DWS-3227P - xStack Switch - Stackable Instrukcja Użytkownika Strona 8