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Configuring IP Utilities
2-16 117358-A Rev. A
There are two types of time servers in the NTP model: primary time servers and
secondary time servers. A primary time server is directly synchronized to a
primary reference source, usually a wire or radio clock that is synchronized to a
radio station that provides a standard time service. The primary time server is the
authoritative time source in the hierarchy, meaning that it is the one true time
source to which the other NTP devices in the subnet will synchronize their
internal clocks.
A secondary time server synchronizes its time from a primary time server or from
one or more secondary time servers to form a synchronization subnet (see
F
igure 2-5). A synchronization subnet is a self-organizing, hierarchical
master-slave configuration with the primary servers at the root and the secondary
servers of decreasing accuracy at successive levels from the primary servers.
Figure 2-5. Time Servers Forming a Synchronization Subnet
In the NTP model, the synchronization subnet automatically reconfigures in a
hierarchical master-slave configuration to produce the most accurate and reliable
time, even when one or more primary time servers or the network path between
them fails. This includes a case in which all the primary servers on a partitioned
subnet fail, but one or more backup primary servers continue to operate. Should
all primary time servers in the subnet fail, the remaining secondary servers will
synchronize among themselves.
TCP0007A
P
S
SS
SS
Stratum 1
Stratum 2
Secondary
servers
Stratum 3
Primary
server
- Configuring IP Utilities 1
- Contents 5
- 117358-A Rev. A 10
- About This Guide 17
- Before You Begin 18
- Conventions 18
- Acronyms 19
- Bay Networks Customer Service 20
- How to Get Help 21
- Chapter 1 23
- NetBIOS over IP Services 24
- 1-4 117358-A Rev. A 26
- Starting Configuration Tools 27
- 117358-A Rev. A 1-7 29
- Starting TCP Services 30
- Starting FTP Services 32
- Disabling and Enabling FTP 33
- Starting TFTP Services 35
- Starting Telnet Services 37
- 1-18 117358-A Rev. A 40
- Starting NTP Services 42
- Starting NetBIOS over IP 44
- 1-24 117358-A Rev. A 46
- Chapter 2 47
- TCP, FTP, TFTP, Telnet 47
- TCP Features 48
- How TCP Works 48
- 2-4 117358-A Rev. A 50
- (continued) 51
- TCP and IP Service Users 52
- FTP Overview 53
- How FTP Works 54
- Networks routers 55
- TFTP Overview 56
- Telnet Overview 57
- How Telnet Works 58
- Figure 2-3. Telnet Server 59
- 2-14 117358-A Rev. A 60
- Figure 2-4. Telnet Client 60
- NTP Overview 61
- Understanding NTP Terminology 61
- 2-16 117358-A Rev. A 62
- 117358-A Rev. A 2-17 63
- NTP Modes of Operation 64
- 117358-A Rev. A 2-19 65
- NetBIOS Overview 66
- NetBIOS in an IP Environment 67
- 117358-A Rev. A 2-23 69
- 2-24 117358-A Rev. A 70
- Chapter 3 71
- Customizing TCP Services 71
- Chapter 4 77
- Customizing FTP Services 77
- Chapter 5 87
- Customizing TFTP Services 87
- Using BCC 89
- Chapter 6 93
- Technician Interface Console 99
- Pausing Telnet Console Output 100
- Using Site Manager 101
- Using the BCC 101
- Changing the Login Timeout 102
- Changing the Password Timeout 103
- Changing the Command Timeout 104
- Changing Login Retries 106
- Customizing Telnet Services 107
- Configuring IP Utilities 108
- 6-16 117358-A Rev. A 108
- Enabling Diagnostic PTY Data 109
- Changing the History File 110
- Changing the Remote Port 114
- Changing the Command Prompt 115
- prompt system1 116
- Chapter 7 117
- Customizing NTP Services 117
- Disabling and Reenabling NTP 118
- Adding Remote Time Servers 120
- Setting Config Peer Mode 122
- Setting Local Host Mode 123
- Specifying Peer Preference 125
- 7-10 117358-A Rev. A 126
- 7-12 117358-A Rev. A 128
- 7-14 117358-A Rev. A 130
- Chapter 8 131
- Customizing NetBIOS over IP 131
- 8-2 117358-A Rev. A 132
- Configuring a NetBIOS Cache 133
- 8-4 117358-A Rev. A 134
- Aging a Cache Entry 136
- Customizing a Cache Search 138
- 8-10 117358-A Rev. A 140
- 8-12 117358-A Rev. A 142
- 8-14 117358-A Rev. A 144
- Supplying a Scope Identifier 146
- 8-18 117358-A Rev. A 148
- Appendix A 149
- Parameter Descriptions 149
- TCP Global Parameters 150
- FTP Global Parameters 152
- 154
- 154
- TFTP Parameters 155
- A-8 117358-A Rev. A 156
- 157
- A-12 117358-A Rev. A 160
- A-16 117358-A Rev. A 164
- NTP Global Parameters 165
- A-18 117358-A Rev. A 166
- 167
- A-20 117358-A Rev. A 168
- NetBIOS Global Parameters 170
- A-24 117358-A Rev. A 172
- A-28 117358-A Rev. A 176
- IP Accounting Parameters 177
- A-30 117358-A Rev. A 178
- Appendix B 179
- Site Manager Default Settings 179
- FTP Parameters 180
- Telnet Parameters 181
- NTP Parameters 182
- NetBIOS over IP Parameters 183
- Appendix C 185
- C-2 117358-A Rev. A 186
- Specifying the Policy Action 187
- Specifying the IP Service 188
- Specifying the Precedence 189
- Appendix D 191
- Configuring IP Accounting on 191
- Accounting table 192
- (continued) 193
- D-4 117358-A Rev. A 194
- Index-4 117358-A Rev. A 198
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