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DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual
Figure 8- 1. An Example of the Default QoS Mapping on the Switch
The picture above shows the default priority setting for the Switch. Class-3 has the highest priority of the four priority
classes of service on the Switch. In order to implement QoS, the user is required to instruct the Switch to examine the
header of a packet to see if it has the proper identifying tag. Then the user may forward these tagged packets to designated
classes of service on the Switch where they will be emptied, based on priority.
For example, lets say a user wishes to have a video conference between two remotely set computers. The administrator can
add priority tags to the video packets being sent out, utilizing the Access Profile commands. Then, on the receiving end,
the administrator instructs the Switch to examine packets for this tag, acquires the tagged packets and maps them to a class
queue on the Switch. Then in turn, the administrator will set a priority for this queue so that will be emptied before any
other packet is forwarded. This results in the end user receiving all packets sent as quickly as possible, thus prioritizing the
queue and allowing for an uninterrupted stream of packets, which optimizes the use of bandwidth available for the video
conference.
Understanding QoS
The Switch has 5 priority classes of service, one of which is internal and not configurable. These priority classes of service
are labeled as 3, the high class to 0, the lowest class. The eight priority tags, specified in IEEE 802.1p are mapped to the
Switch's priority classes of service as follows:
Priority 0 is assigned to the Switch's Q0 class. •
•
•
•
•
•
•
•
Priority 1 is assigned to the Switch's Q0 class.
Priority 2 is assigned to the Switch's Q1 class.
Priority 3 is assigned to the Switch's Q1 class.
Priority 4 is assigned to the Switch's Q2 class.
Priority 5 is assigned to the Switch's Q2 class.
Priority 6 is assigned to the Switch's Q3 class.
Priority 7 is assigned to the Switch's Q3 class.
83
- 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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