VLANidt

VLANIDt is a term sometimes encountered in network configurations, particularly within certain vendor-specific implementations or older documentation. It refers to a VLAN (Virtual Local Area Network) identifier. VLANs are used to segment a physical network into multiple logical broadcast domains, improving performance, security, and manageability.

The "t" suffix in VLANIDt is not a standardized part of the IEEE 802.1Q VLAN tagging protocol, which defines the format of VLAN tags within Ethernet frames. Standard VLAN IDs are numerical values ranging from 0 to 4095. The "t" might have been used historically by a specific vendor to denote a "tag" or "tagged" VLAN, differentiating it from an "untagged" VLAN, where traffic belonging to that VLAN would not have an explicit VLAN tag in its frame header.

In modern networking, the distinction between tagged and untagged traffic is generally understood without specific suffixes like "t" appended to the VLAN ID itself. Network administrators configure ports as either "access" ports (typically carrying untagged traffic for a single VLAN) or "trunk" ports (carrying tagged traffic for multiple VLANs). The concept represented by VLANIDt is effectively the standard VLAN ID, with the context of whether the traffic is tagged or untagged determined by the port configuration. When encountering VLANIDt, it's important to refer to the specific vendor's documentation or the context of the network configuration to fully understand its precise meaning and application.