Avaya Configuring IP Utilities Uživatelský manuál Strana 67
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Hodnocené. / 5. Na základě hodnocení zákazníků
Customizing NTP Services
114071 Rev. A 6-3
Adding Time Servers
You can add time servers to a router by specifying the IP address of each time
server (peer). NTP adds the IP address of the time server to a peer list, which NTP
uses when querying time servers for time information. Bay Networks
recommends that you configure a minimum of three upper stratum time servers
(peers) for a router, since it can apply an agreement algorithm to detect a problem
on any part of the time source. You can, if necessary, add a maximum of five time
servers on a router. Configuring multiple time servers ensures redundancy in case
one peer goes down unexpectedly.
NTP queries all the time servers in the peer list for time information and then
determines which server to synchronize its internal clock to based on the
following criteria:
• Lowest stratum
• Closest in proximity to the primary time server
• Claimed highest precision
When the NTP client queries the time servers from the peer list, the servers
respond with various time stamps, along with information about their clocks, such
as stratum, precision, and time reference. The NTP client reviews a list of
responses from all the available servers and chooses one server as the “best” time
source from which to synchronize its internal clock.
Setting Config Peer Mode
The Config Peer Mode parameter allows you to specify the mode for the time
server (peer). By default, Config Peer Mode is set to Server, indicating that the
NTP client adjusts its clock to the given time server but does not attempt to adjust
the time server’s clock. Currently, Bay Networks supports only the Server option.
Site Manager: Peer IP Address parameter: page A-16
Site Manager: Configure Peer Mode parameter: page A-18
- Configuring IP Utilities 1
- Bay Networks Software License 3
- Contents 5
- 114071 Rev. A vii 7
- 114071 Rev. A ix 9
- 114071 Rev. A xi 11
- 114071 Rev. A xiii 13
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- 114071 Rev. A 18
- 114071 Rev. A xix 19
- Bay Networks Customer Service 20
- World Wide Web 21
- Customer Service FTP 21
- Support Source CD 22
- CompuServe 22
- InfoFACTS 23
- How to Get Help 23
- Chapter 1 25
- Configuring IP on a Circuit 26
- Starting TCP 26
- Starting FTP 27
- Starting Telnet 28
- Starting NTP 29
- Where to Go Next 30
- Chapter 2 31
- How TCP Works 32
- TCP Features 32
- 2-4 114071 Rev. A 34
- (continued) 35
- TCP0001A 36
- FTP Overview 37
- TCP0002A 38
- Networks routers 39
- Telnet Overview 40
- TCP0005A 42
- NTP Overview 43
- NTP Architecture 43
- TCP0007A 44
- NTP Client Modes 45
- Unicast Client Mode 45
- TCP0006A 46
- Chapter 3 49
- Customizing TCP Services 49
- Configuring TCP on the Router 50
- Chapter 4 53
- Customizing FTP Services 53
- 4-2 114071 Rev. A 54
- Chapter 5 57
- Customizing Telnet Services 57
- 5-2 114071 Rev. A 58
- 5-4 114071 Rev. A 60
- 5-6 114071 Rev. A 62
- Chapter 6 65
- Customizing NTP Services 65
- Configuring NTP on the Router 66
- Adding Time Servers 67
- Setting Config Peer Mode 67
- Setting Local Host Mode 68
- Specifying Peer Preference 68
- Configuring NTP Access Control 69
- Appendix A 71
- Parameter Descriptions 71
- TCP Global Parameters 72
- FTP Global Parameters 74
- 76
- 76
- 77
- A-10 114071 Rev. A 80
- A-14 114071 Rev. A 84
- NTP Global Parameters 85
- A-16 114071 Rev. A 86
- 87
- A-18 114071 Rev. A 88
- Appendix B 91
- Site Manager Default Settings 91
- FTP Parameters 92
- Telnet Parameters 93
- NTP Parameters 94
- 114071 Rev. A Index-1 95
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