ZyXEL Communications GS1510-16 -, Руководство пользователя

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GS1510 Series User’s Guide
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H A P T E R
10
VLAN
10.1 Overview
This chapter shows you how to configure IEEE 802.1Q tagged VLANs and port-
based 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).