ZyXEL GS1510-24 User Guide - Page 63
Overview, What You Can Do, What You Need to Know
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CHAPTER 10 VLAN 10.1 Overview This chapter shows you how to configure IEEE 802.1Q tagged VLANs and portbased VLANs. 10.2 What You Can Do • Use the Port Isolation screen (Section 10.4 on page 64) to specify which ports can communicate with each other. • Use the VLAN Settings screen (Section 10.5 on page 67) to configure a VLAN and assign member ports. • Use the Tag Settings screen (Section 10.6 on page 68) to add a VLAN ID tag to all outgoing frames on a member port. • Use the Port Settings screen (Section 10.7 on page 69) to configure the VLAN port settings. 10.3 What You Need to Know 10.3.1 Introduction to IEEE 802.1Q Tagged VLANs A tagged VLAN uses an explicit tag (VLAN ID) in the MAC header to identify the VLAN membership of a frame across bridges - they are not confined to the switch on which they were created. The VLANs can be created statically by hand or dynamically through GVRP. The VLAN ID associates a frame with a specific VLAN and provides the information that switches need to process the frame across the network. A tagged frame is four bytes longer than an untagged frame and contains two bytes of TPID (Tag Protocol Identifier, residing within the type/length field of the Ethernet frame) and two bytes of TCI (Tag Control Information, starts after the source address field of the Ethernet frame). GS1510 Series User's Guide 63