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What is Active VLAN?
An Active VLAN is a VLAN that is actively used to separate traffic on a network. It helps keep devices isolated within their own virtual network while controlling communication. Active VLANs are configured on switch ports, allowing devices to communicate within the same VLAN. Once configured, these VLANs enable network management, security, and improved performance. An active VLAN helps maintain organization within a network by segmenting traffic efficiently.
VLANs range from 1-4096 and can be defined or configured on the switch. The 256 active VLANs limit refers to how many VLANs can be actively used for data transmission at any given time.
If there are more than the 256 active VLANs limit (e.g., 300 VLANs), the switch may not actively forward data for the additional VLANs beyond the active limit. These excess VLANs’ data may not be transmitted, resulting in dropped frames or a bottleneck in data transmission. The switch might reject the extra VLANs or prevent data from being sent until space is available for active VLANs.