How to Configure VLANs on a Cisco Switch. This post will deal with configuring Layer 2 VLANs on Cisco switches. Up to 4. 09. 4 VLANs can be configured on Cisco catalyst switches. By default, only VLAN 1 is configured on the switch, so if you connect hosts on an out of the box switch they all belong to the same Layer 2 broadcast domain. The need to configure several Layer 2 VLANs on a switch arises from the need to segment an internal Local Area Network LAN into different IP subnetworks. If you want for example to separate the different departments of your enterprise into different IP subnetworks, then each department should belong to its own Layer 2 VLAN. For example, lets assume the following scenario Accounting Department IP Subnet 1. VLAN 2 Management Department IP Subnet 1. VLAN 3 Engineering Department IP Subnet 1. VLAN 4. By separating the internal LAN into different IP subnets and thus different VLANs allows the network administrators to enforce traffic restrictions if needed between departments and have better control of internal hosts. VLAN assignment on a switch is configured on a per interface basis. That is, each switch port interface is assigned individually into a Layer 2 VLAN. If you have more than one switch connected and you want the same VLANs to belong across all switches, then a Trunk Port must be configured between the switches. The Trunk Port passes all VLANs between the switches. Lets see the following network scenario to help us clarify some concepts. This post will deal with configuring Layer 2 VLANs on Cisco switches. Up to 4094 VLANs can be configured on Cisco catalyst switches. By default, only VLAN 1 is.
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January 2018
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