Reliability and Recovery
270 Avaya Application Solutions IP Telephony Deployment Guide
In this configuration, the redundant pair of WAN links is 99.9% to 99.99% available. In the
headquarters in Atlanta, the N+1 IPSI and N+1 C-LAN will guarantee sufficient IP resources in
the event of a C-LAN or IPSI failure.
Table 61: Local availability values are improved in the branch offices
with redundant connections
Avaya Product
Enterprise’s Solution
including LAN and WAN link
Availability
1
1. The inter-site traffic reliability highly depends on the availability of the redundant
WAN link connections. With proper design, the redundancy enhances the link
availability to the range of 99.95% -- 99.995%, here the average (99.97%) is
used in the calculations.
Site
Availability
Annual
Downtime
Minutes
Availability
Per Site
Annual
Downtime
Minutes
Atlanta
99.995%
26.3
99.995%
26.3
Boston
99.99%
53
99.99%
53
Cleveland
99.99%
53
99.99%
53
Table 62: Inter-Site Traffic Availability improved with Redundant WAN
Connections
Full Solution Availability Projected
Weighted Downtime
minutes.
% of traffic generated in Atlanta
×
Annual
downtime minutes in Atlanta
(43.3% + 14.2%)
×
26.3 = 15
% of traffic generated in Boston
×
Annual
downtime minutes in Boston
(16% + 2%)
×
53 = 9.5
% of traffic between Atlanta and Boston
×
Annual downtime minutes due to failure in
Atlanta, WAN, and in Boston
(5.2% + 5.2%)
×
263 = 27
% of traffic generated in Cleveland
×
Annual
downtime minutes in Cleveland
(7% + 0.4%)
×
53 = 0.75
% of traffic between Atlanta and Cleveland
×
Annual downtime minutes due to failure in
Atlanta, WAN and in Cleveland
(2.7% + 2.2%)
×
263 = 47
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Summary of Contents for Application Solutions
Page 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Page 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Page 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Page 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Page 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Page 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...