VES-1616F-3x Series User’s Guide
87
C
H A P T E R
7
VLAN
The type of screen you see here depends on the
VLAN Type
you selected in the
Switch Setup
screen. This chapter shows you how to configure 802.1Q tagged and port-based VLANs.
7.1 Introduction to IEEE 802.1Q Tagged VLAN
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).
The CFI (Canonical Format Indicator) is a single-bit flag, always set to zero for Ethernet
switches. If a frame received at an Ethernet port has a CFI set to 1, then that frame should not
be forwarded as it is to an untagged port. The remaining twelve bits define the VLAN ID,
giving a possible maximum number of 4,096 VLANs. Note that user priority and VLAN ID
are independent of each other. A frame with VID (VLAN Identifier) of null (0) is called a
priority frame, meaning that only the priority level is significant and the default VID of the
ingress port is given as the VID of the frame. Of the 4096 possible VIDs, a VID of 0 is used to
identify priority frames and value 4095 (FFF) is reserved, so the maximum possible VLAN
configurations are 4,094.
7.1.1 Forwarding Tagged and Untagged Frames
Each port on the switch is capable of passing tagged or untagged frames. To forward a frame
from an 802.1Q VLAN-aware switch to an 802.1Q VLAN-unaware switch, the switch first
decides where to forward the frame and then strips off the VLAN tag. To forward a frame
from an 802.1Q VLAN-unaware switch to an 802.1Q VLAN-aware switch, the switch first
decides where to forward the frame, and then inserts a VLAN tag reflecting the ingress port's
default VID. The default PVID is VLAN 1 for all ports, but this can be changed.
TPID
2 Bytes
User Priority
3 Bits
CFI
1 Bit
VLAN ID
12 Bits
Содержание VDSL SWITCH VES-1616F-3X
Страница 1: ...www zyxel com VES 1616F 3x Series VDSL Switch User s Guide Version 3 60 5 2007 Edition 2 ...
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Страница 7: ...Safety Warnings VES 1616F 3x Series User s Guide 7 ...
Страница 8: ...Safety Warnings VES 1616F 3x Series User s Guide 8 ...
Страница 28: ...List of Tables VES 1616F 3x Series User s Guide 28 ...
Страница 29: ...29 PART I Introduction Getting to Know Your Switch 31 Hardware Installation 35 Hardware Overview 37 ...
Страница 30: ...30 ...
Страница 34: ...Chapter 1 Getting to Know Your Switch VES 1616F 3x Series User s Guide 34 ...
Страница 42: ...Chapter 3 Hardware Overview VES 1616F 3x Series User s Guide 42 ...
Страница 43: ...43 PART II Status and Basic The Web Configurator 45 System Status and Port Statistics 53 Basic Setting 63 ...
Страница 44: ...44 ...
Страница 62: ...Chapter 5 System Status and Port Statistics VES 1616F 3x Series User s Guide 62 ...
Страница 84: ...Chapter 6 Basic Setting VES 1616F 3x Series User s Guide 84 ...
Страница 86: ...86 ...
Страница 94: ...Chapter 7 VLAN VES 1616F 3x Series User s Guide 94 Figure 33 Port Based VLAN Setup All Connected ...
Страница 106: ...Chapter 10 Spanning Tree Protocol VES 1616F 3x Series User s Guide 106 ...
Страница 120: ...Chapter 15 Port Authentication VES 1616F 3x Series User s Guide 120 ...
Страница 126: ...Chapter 17 Queuing Method VES 1616F 3x Series User s Guide 126 ...
Страница 131: ...Chapter 18 Classifier VES 1616F 3x Series User s Guide 131 Figure 51 Classifier Example ...
Страница 132: ...Chapter 18 Classifier VES 1616F 3x Series User s Guide 132 ...
Страница 138: ...Chapter 19 Policy VES 1616F 3x Series User s Guide 138 Figure 53 Policy Example ...
Страница 144: ...Chapter 20 VLAN Stacking VES 1616F 3x Series User s Guide 144 ...
Страница 155: ...Chapter 21 Multicast VES 1616F 3x Series User s Guide 155 Figure 65 MVR Group Configuration Example ...
Страница 156: ...Chapter 21 Multicast VES 1616F 3x Series User s Guide 156 ...
Страница 160: ...Chapter 22 Differentiated Services VES 1616F 3x Series User s Guide 160 ...
Страница 161: ...161 PART IV Routing Protocol Static Route 163 DHCP Relay 165 ...
Страница 162: ...162 ...
Страница 168: ...168 ...
Страница 178: ...Chapter 25 Maintenance VES 1616F 3x Series User s Guide 178 ...
Страница 192: ...Chapter 27 Diagnostic VES 1616F 3x Series User s Guide 192 ...
Страница 196: ...Chapter 28 Syslog VES 1616F 3x Series User s Guide 196 ...
Страница 202: ...Chapter 29 Cluster Management VES 1616F 3x Series User s Guide 202 ...
Страница 208: ...208 ...
Страница 242: ...Chapter 32 Introducing the Commands VES 1616F 3x Series User s Guide 242 ...
Страница 266: ...Chapter 34 IEEE 802 1Q Tagged VLAN Commands VES 1616F 3x Series User s Guide 266 ...
Страница 274: ...Chapter 35 Troubleshooting VES 1616F 3x Series User s Guide 274 ...
Страница 282: ...Chapter 36 Product Specifications VES 1616F 3x Series User s Guide 282 ...
Страница 284: ...284 ...
Страница 298: ...Appendix B Legal Information VES 1616F 3x Series User s Guide 298 ...
Страница 310: ...Index VES 1616F 3x Series User s Guide 310 ...