This delay gave engineers a considerable amount of time to find-and learn to prefer-VLAN assignment (using the extended range) without using VTP. However, VTP still didn't support the VLANs from this extended range until version 3, which wasn't released until 2009. This welcome improvement provided additional flexibility to network engineers.

One change related to this conversation is that the standard provided a trunking mechanism that supported up to 4,094 VLANs (minus the reserved ones). The IEEE 802.1Q standard caused a lot of changes. This range was further limited by the fact that VLANs 1002–1005 were reserved, leaving only VLANs 1–1001 for user allocations. This means that when using VTP version 1 or 2 (the default), the only supported VLANs would be from this standard range. Because ISL supported only VLANs from 1–1005, early versions of VTP also supported only those VLANs. For this article, you will not need to know the details of how VTP works, but we will look at how VTP affects how VLANs can be configured.Ĭisco's original Catalyst switches supported a single trunking protocol: the Cisco Inter-Switch Link (ISL). Since the lat 1990s, Cisco switches have supported a proprietary protocol that is intended to help engineers configure the same VLANs across multiple switches: the Virtual Trunking Protocol (VTP). A Brief History Lesson: VTP's Effects on VLANīefore we get into the commands themselves, let's examine how VLANs have been implemented on Cisco switches historically. The second section discusses a scenario in which VLANs are used, detailing the configuration commands used to meet the scenario requirements. The first section of this article focuses on the commands used to configure VLANs and their associated parameters.

This article picks up at that point, discussing the methods of configuring VLANs on Cisco (IOS) switches. Physical LANs: Device Functionalities,' and clearly understand what VLANs do and why they are used. I hope you have read my previous article on virtual LAN (VLAN) concepts, 'Virtual vs. CCNA Routing and Switching 200-120 Network Simulator

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