D-Link DGS-3100-24 User Manual Page 53
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DGS-3100 Series Gigabit Stackable Managed Switch User Manual
39
Configuring SNTP
The device supports the Simple Network Time Protocol (SNTP). SNTP assures accurate network device clock time
synchronization up to the millisecond. Time synchronization is performed by a network SNTP server. The device operates
only as an SNTP client, and cannot provide time services to other systems. The device polls Unicast type servers for the
server time.
Time sources are established by stratums. Stratums define the accuracy of the reference clock. The higher stratum (where
zero is the highest), the more accurate the clock. The device receives time from stratum 1 and above.
The following is an example of stratums:
Stratum Example
Stratum 0
A real time clock (such as a GPS system) is used as the time source.
Stratum 1
A server that is directly linked to a Stratum 0 time source is used as the time source. Stratum 1
time servers provide primary network time standards
Stratum 2
The time source is distanced from the Stratum 1 server over a network path. For example, a
Stratum 2 server receives the time over a network link, via NTP, from a Stratum 1 server.
Information received from SNTP servers is evaluated based on the Time level and server type. SNTP time definitions are
assessed and determined by the following time levels:
Time level SNTP Time Definition
T1
The time at which the original request was sent by the client.
T2
The time at which the original request was received by the server.
T3
The time at which the server sent the client a reply.
T4
The time at which the client recived the server's reply.
- User Manual 1
- Table of Contents 3
- Preface 7
- System Overview 8
- Viewing the Device 8
- Device Management Methods 9
- User Guide Overview 9
- Intended Audience 9
- Notes, Notices, and Cautions 10
- Safety Cautions 11
- GETTING STARTED 15
- Downloading Software 16
- Set Terminal Baud-Rate 16
- Defining Stacking Units 17
- Using the Tool Menu 21
- Resetting the Device 23
- Downloading the Firmware 24
- Rebooting the System 26
- Viewing Device Information 29
- Defining System Information 31
- Defining IP Addresses 32
- Managing Stacking 33
- Assigning Unit IDs 34
- Stack Startup Process 35
- Stack Resiliency 37
- Stack Management Examples 38
- Dividing Stacks 40
- Merging Stacks 42
- Stacking Cable Failure 42
- Configuring Stacking 44
- Defining Ports 45
- Viewing Port Properties 47
- ARP Settings 48
- Configuring User Accounts 49
- Managing System Logs 51
- Configuring SNTP 53
- Configuring SNMP 59
- Defining SNMP Views 60
- Defining SNMP Groups 61
- Defining SNMP Users 63
- Defining SNMP Communities 65
- Defining SNMP Host Table 66
- Defining SNMP Engine ID 68
- Enabling SNMP Traps 69
- DHCP Auto Configuration 70
- Dual Image Services 71
- Config Firmware Image 72
- Telnet Setting 73
- CONFIGURING L2 FEATURES 74
- Enabling Jumbo Frames 75
- Configuring VLANs 76
- 802.1Q VLAN Tags 78
- Port VLAN ID 79
- Tagging and Untagging 79
- Ingress Filtering 79
- Default VLANs 80
- VLAN and Trunk Groups 80
- VLAN Status 80
- Defining VLAN Properties 81
- Configuring GVRP 83
- Defining Trunking 85
- Traffic Segmentation 87
- Configuring LACP 88
- Defining IGMP Snooping 89
- Defining MLD Snooping 93
- Configuring Port Mirroring 97
- Configuring Spanning Tree 99
- Defining STP Port Settings 102
- Defining Unicast Forwarding 107
- Configuring LLDP 111
- Defining LLDP Port Settings 112
- Configuring 1p 123
- Understanding QoS 125
- Defining Bandwidth Settings 126
- Configuring Storm Control 128
- SECURITY FEATURES 133
- Configuring Trust Host 135
- Configuring Port Security 136
- Configuring Guest VLANs 138
- Defining RADIUS Settings 147
- Defining Login Methods 157
- Defining Enable Methods 159
- MONITORING THE DEVICE 162
- Viewing Stacking Information 163
- Viewing CPU Utilization 164
- Viewing Port Utilization 165
- View Table 166
- View Table 169
- Viewing ARP Table 172
- Viewing MLD Router Ports 173
- Viewing Router Ports 174
- Viewing Session Table 175
- Viewing System Log 180
- ACL Configuration Wizard 186
- Adding ACL Profiles 188
- Defining Level 2 ACL 190
- Defining Level 3 ACL 193
- Defining Access Rules Lists 201
- Finding ACL Rules 204
- Defining Time Ranges 207
- Product Registration 213
- LIMITED WARRANTY 214
- FCC Warning 217
- TECHNICAL SUPPORT 218
- Technical Support 218
- Technische Unterstützung 220
- Assistance technique 221
- Asistencia Técnica 222
- Supporto tecnico 223
- Pomoc techniczna 225
- Technická podpora 226
- Technikai Támogatás 227
- Teknisk Support 228
- Teknistä tukea asiakkaille 230
- Suomessa: 230
- Suporte Técnico 232
- Τεχνική Υποστήριξη 233
- Техническая поддержка 236
- 友訊科技 台灣分公司 239
- Dukungan Teknis 240
- International Offices 242
- ______________________ 244
- ____________ 244
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