Avaya Configuring IP Utilities Manuel d'utilisateur Page 45
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
TCP, FTP, Telnet, and NTP Concepts
114071 Rev. A 2-15
Synchronizing with the Best Available Time Server
Each NTP client in the synchronization subnet chooses the best available time
server from which to synchronize its internal clock. NTP uses the following
criteria to determine the time server whose time is best:
• Time server with the lowest stratum
• Time server closest in proximity to the primary time server (reduces network
delays)
• Time server offering the highest claimed precision
NTP prefers to have access to several (at least three) servers at the lower stratum
level, since it can apply an agreement algorithm to detect a problem on any part of
the time source.
NTP Client Modes
NTP provides three modes (or associations) in which servers and clients can
communicate with each other: Unicast Client mode, Broadcast Client mode, and
Multicast Client mode. Currently, Bay Networks supports only NTP Client mode.
NTP servers and clients form an NTP relationship and maintain an association
instance when they exchange messages.
Unicast Client Mode
You use Unicast Client mode primarily to configure a set of time servers (or peers)
for time synchronization. You can also configure access control filters for time
servers in Unicast Client mode, but normally you would perform this operation in
Broadcast Client or Multicast Client mode. For more information on performing
these tasks, see Chapter 6.
When you configure a set of time servers (peers) in Unicast Client mode, NTP
creates a peer list that includes each time server’s IP address. The NTP client uses
the peer list to determine which time servers to query for time information. When
the NTP client queries the time servers from the peer list, the time servers respond
with various time stamps, along with information about their clocks, such as
stratum, precision, and time reference (Figure 2-6). The NTP client reviews a list
of responses from all the available servers and chooses one server as the “best”
available time source from which to synchronize its internal clock.
- 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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