Table of Contents
Advertisement
Reliability and Recovery
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
Site
Atlanta
Boston
Cleveland
Table 62: Inter-Site Traffic Availability improved with Redundant WAN
Connections
Full Solution Availability Projected
% of traffic generated in Atlanta
downtime minutes in Atlanta
% of traffic generated in Boston
downtime minutes in Boston
% of traffic between Atlanta and Boston
Annual downtime minutes due to failure in
Atlanta, WAN, and in Boston
% of traffic generated in Cleveland
downtime minutes in Cleveland
% of traffic between Atlanta and Cleveland
Annual downtime minutes due to failure in
Atlanta, WAN and in Cleveland
270 Avaya Application Solutions IP Telephony Deployment Guide
Avaya Product
Availability
99.995%
99.99%
99.99%
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.
Enterprise's Solution
including LAN and WAN link
Availability
Annual
Availability
Downtime
Minutes
26.3
99.995%
53
99.99%
53
99.99%
Weighted Downtime
minutes.
Annual
(43.3% + 14.2%)
Annual
(16% + 2%)
(5.2% + 5.2%)
Annual
(7% + 0.4%)
(2.7% + 2.2%)
1
Per Site
Annual
Downtime
Minutes
26.3
53
53
26.3 = 15
53 = 9.5
263 = 27
53 = 0.75
263 = 47
1 of 2
Advertisement
Table of Contents
