Issue 3.4.1 June 2005
351
Network recovery
Conventional wisdom holds that network reliability is typically 3-9s (99.9%) on a LAN, and 2-9s
(99%) on a WAN. The leading causes of network failure are a WAN link failure, administrator
error, cable failure, issues that involve connecting new devices or services, and malicious
activity, including DoS attacks, worms, and viruses. Somewhere lower down on the list are
equipment failures. To achieve the highest levels of availability, it is important that a strong
change control policy and network management strategy be implemented.
There are numerous techniques for improving the reliability of data networks, including
spanning tree, self-healing routing protocols, network management, and change control. This
section discusses the following techniques:
●
Change control
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Layer 2 mechanisms to increase reliability
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Layer 3 availability mechanisms
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Dial backup
●
Convergence times
Change control
Change control describes a process by which an organization can control non-emergency
network changes, and reduce the likelihood of administrator errors that cause network
disruption. It involves carefully planning for network changes (including back-out plans),
reviewing proposed changes, assessing risk, scheduling changes, notifying affected user
communities, and performing changes when they will be least disruptive. By implementing a
strict change control process, organizations can reduce the likelihood of administrator errors,
which are a major cause of network disruption, and increase the reliability of their networks.
Change control
contains more information on change control.
Содержание Application Solutions
Страница 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Страница 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Страница 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 74: ...Avaya Application Solutions platforms 74 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Страница 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 214: ...Voice quality network requirements 214 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 239: ...Reliability Issue 3 4 1 June 2005 239 Figure 69 S8700 Media Server in a high reliability configuration ...
Страница 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Страница 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 350: ...Implementing Communication Manager on a data network 350 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Страница 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...