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Noté. / 5. Basé sur avis des utilisateurs
DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual
VLANs allow a network to be segmented in order to reduce the size of broadcast domains. All packets entering a VLAN
will only be forwarded to the stations (over IEEE 802.1Q enabled switches) that are members of that VLAN, and this
includes broadcast, multicast and unicast packets from unknown sources.
VLANs can also provide a level of security to your network. IEEE 802.1Q VLANs will only deliver packets between
stations that are members of the VLAN.
Any port can be configured as either tagging or untagging. The untagging feature of IEEE 802.1Q VLANs allows VLANs
to work with legacy switches that don't recognize VLAN tags in packet headers. The tagging feature allows VLANs to
span multiple 802.1Q-compliant switches through a single physical connection and allows Spanning Tree to be enabled on
all ports and work normally.
The IEEE 802.1Q standard restricts the forwarding of untagged packets to the VLAN of which the receiving port is a
member.
The main characteristics of IEEE 802.1Q are as follows:
Assigns packets to VLANs by filtering. •
•
•
•
•
•
•
•
Assumes the presence of a single global spanning tree.
Uses an explicit tagging scheme with one-level tagging.
802.1Q VLAN Packet Forwarding
Packet forwarding decisions are made based upon the following three types of rules:
Ingress rules - rules relevant to the classification of received frames belonging to a VLAN.
Forwarding rules between ports - decides whether to filter or forward the packet.
Egress rules - determines if the packet must be sent tagged or untagged.
Figure 7- 1. IEEE 802.1Q Packet Forwarding
802.1Q VLAN Tags
The figure below shows the 802.1Q VLAN tag. There are four additional octets inserted after the source MAC address.
Their presence is indicated by a value of 0x8100 in the EtherType field. When a packet's EtherType field is equal to
0x8100, the packet carries the IEEE 802.1Q/802.1p tag. The tag is contained in the following two octets and consists of 3
bits of user priority, 1 bit of Canonical Format Identifier (CFI - used for encapsulating Token Ring packets so they can be
carried across Ethernet backbones), and 12 bits of VLAN ID (VID). The 3 bits of user priority are used by 802.1p. The
VID is the VLAN identifier and is used by the 802.1Q standard. Because the VID is 12 bits long, 4094 unique VLANs can
be identified.
66
- Table of Contents 3
- Preface 8
- Intended Readers 9
- Notes, Notices, and Cautions 9
- Safety Instructions 10
- Products 11
- Introduction 13
- Ethernet Technology 15
- Rear Panel Description 17
- Side Panel Description 17
- Installation 18
- Power On 19
- The Optional Modules 20
- Connecting the Switch 22
- Switch to Hub or Switch 23
- Section 4 25
- Password Protection 29
- SNMP Settings 29
- IP Address Assignment 31
- Configuration 33
- Web-based User Interface 34
- Web Pages 36
- Administration 37
- IP Address 39
- Port Configurations 41
- Port Description 43
- User Accounts 44
- Admin and User Privileges 45
- Port Mirroring 46
- System Log Servers 47
- SNTP Settings 49
- Time Zone and DST 50
- TFTP Services 52
- Ping Test 52
- SNMP Manager 53
- SNMP User Table 54
- SNMP View Table 56
- SNMP Group Table 57
- SNMP Community Table 59
- SNMP Host Table 60
- SNMP Engine ID 61
- D-Link Single IP Management 62
- SIM Using the Web Interface 63
- Forwarding & Filtering 64
- Multicast Forwarding 65
- L2 Features 66
- 802.1Q VLAN Tags 67
- Tagging and Untagging 68
- Ingress Filtering 69
- Default VLANs 69
- VLAN Segmentation 69
- VLAN and Trunk Groups 70
- Static VLAN Entry 71
- Link Aggregation 73
- IGMP Snooping 75
- Static Router Ports 77
- Spanning Tree 78
- STP Bridge Global Settings 79
- STP Port Settings 81
- Section 8 83
- Understanding QoS 84
- Bandwidth Control 86
- 802.1p Default Priority 87
- 802.1p User Priority 88
- QoS Scheduling Mechanism 88
- QoS Output Scheduling 89
- Security 90
- Port Security 92
- Port Lock Entries 93
- Authentication Server 95
- Authenticator 95
- Authentication Process 97
- Access Control 98
- Ethernet Switch 99
- Local Users 102
- Port Capability 102
- RADIUS Server 106
- Trusted Host 108
- Traffic Segmentation 108
- Monitoring 110
- Port Utilization 111
- Packets 112
- UMB Cast (RX) 114
- Transmitted (TX) 116
- Received (RX) 118
- Packet Size 122
- MAC Address 124
- Switch History Log 126
- IGMP Snooping Group 127
- Browse Router Port 128
- Browse ARP Table 128
- Session Table 128
- Port Access Control 129
- RADIUS Accounting 131
- Authenticator Diagnostics 132
- Authenticator Statistics 135
- Authenticator State 137
- Reboot System 140
- Save Changes 140
- Appendix A 141
- General 142
- Performance 142
- Appendix B 143
- Appendix C 144
- Glossary 145
- Warranties and Registration 147
- FCC Warning 149
- General Terms 153
- Allgemeine Bedingungen 154
- Conditions Générales 155
- Condiciones generales 156
- Limitazione della Garanzia 157
- Periodo di garanzia 157
- Garante 157
- Technical Support 158
- Техническая поддержка 165
- Asistencia Técnica 166
- Suporte Técnico 167
- Technische Unterstützung 171
- Assistance technique 172
- Supporto tecnico 174
- Pomoc techniczna 176
- Technická podpora 177
- Technikai Támogatás 178
- Teknisk Support 179
- Teknistä tukea asiakkaille 181
- Suomessa: 181
- International Offices 184
- Registration Card 185
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