Chapter 2 Network configuration 105Using the Business Policy Switch 2000 Version 1.2Figure 17 Port-based VLAN exampleIEEE 802.1Q taggingBusiness Policy Switches operate in accordance with the IEEE 802.1Q taggingrules. Important terms used with the 802.1Q tagging feature are:• VLAN identifier (VID)—the 12-bit portion of the VLAN tag in the frameheader that identifies an explicit VLAN. When other types of VLANs areenabled, this default value can be overridden by the values enabled in themanagement interfaces. Refer to Chapter 3, Using Web-based Managementfor the Business Policy Switch 2000 Software Version 1.2, Reference for theBusiness Policy Switch 2000 Command Line Interface Software Version 1.2,and Reference for the Business Policy Switch 2000 Management SoftwareVersion 1.2 for information on overriding the default values.• Port VLAN identifier (PVID)—a classification mechanism that associates aport with a specific VLAN. For example, a port with a PVID of 3 (PVID =3)assigns all untagged frames received on this port to VLAN 3.With software version 1.1, you can automatically assign the PVIDs.• Tagged frame—the 32-bit field (VLAN tag) in the frame header that identifiesthe frame as belonging to a specific VLAN. Untagged frames are marked(tagged) with this classification as they leave the switch through a port that isconfigured as a tagged port.BusinessPolicy Switch2000VLAN 1 VLAN 29798EA
