Nortel Networks 1000BASE-ZX, 1000BASE-SX, 1000ASE-XD Ieee 802.1Q tagging, Port-based Vlan example

Chapter 2 Network configuration 55

Figure 11 Port-based VLAN example

VLAN 1

BayStack 420

VLAN 2

10004EA

IEEE 802.1Q tagging

BayStack 420 switches operate in accordance with the IEEE 802.1Q tagging rules. Important terms used with the 802.1Q tagging feature are:

•VLAN identifier (VID)—the 12-bit portion of the VLAN tag in the frame header that identifies an explicit VLAN. When other types of VLANs are enabled, this default value can be overridden by the values enabled in the Web-based management interface. Refer to Using Web-Based Management for the BayStack 420 10/100/1000 Switch.

•Port VLAN identifier (PVID)—a classification mechanism that associates a port 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.

•Tagged frame— the 32-bit field (VLAN tag) in the frame header that identifies the frame as belonging to a specific VLAN. Untagged frames are marked (tagged) with this classification as they leave the switch through a port that is configured as a tagged port.

•Untagged frame— a frame that does not carry any VLAN tagging information in the frame header.

•VLAN port members— a set of ports that form a broadcast domain for a specific VLAN. A port can be a member of one or more VLANs.

Using the BayStack 420 10/100/1000 Switch